Air valve and axial flow fan

Abstract

The invention provides an air valve and an axial flow fan. The air valve comprises a barrel, a first valve plate and a second valve plate. The first valve plate and the second valve plate are symmetrically mounted at the air outlet of the barrel body, the first valve plate is provided with a first rotating rod, the second valve plate is provided with a second rotating rod, and the first valve plate and the second valve plate rotate outwards to be opened under the action of airflow; a transmission mechanism is arranged on the barrel body, the transmission mechanism is movably arranged in the axial direction of the barrel body, and the first end of the first rotating rod and the first end of the second rotating rod are in transmission connection with the transmission mechanism, so that the opening and closing angles of the first valve plate and the second valve plate can be adjustably arranged according to the air volume. According to the invention, the first valve plate and the second valve plate are symmetrically mounted at the air outlet of the cylinder body, and the transmission mechanism is connected with the first rotating rod and the second rotating rod, so that the transmission mechanism can adjust the opening and closing angles of the valve plates as required.

Description

Technical Field

[0001] This invention belongs to the technical field of air supply devices, specifically relating to an air valve and an axial flow fan. Background Technology

[0002] An axial flow fan is a type of fan that uses a motor inside a duct to rotate blades and transport gas along the axial direction. It can drive the air in the duct to flow and achieve a ventilation effect. It has the characteristics of large flow rate and low pressure, and is widely used in scenarios that require large air volume and low air pressure to solve the air circulation problem in workshops, factories, farms and other places. Its structure is simple, maintenance cost is low, and it is suitable for long-term operation.

[0003] Existing axial flow fans consist of a motor, air duct, fan blades, and air valves. The air valves of traditional fans are often opened by the air blown out by the rotation of the motor and fan blades. The air valves need a large air volume to be opened to the maximum angle. Conventional fans cannot adjust the output air volume by adjusting the opening and closing angle of the air valves. Summary of the Invention

[0004] This invention provides an air valve and an axial flow fan, which can solve the technical problem that existing air valves cannot adjust the opening and closing angle according to the air volume.

[0005] This invention provides an air valve, which includes a cylinder, a first valve plate, and a second valve plate; The first valve plate and the second valve plate are symmetrically installed at the air outlet of the cylinder. The first valve plate is provided with a first rotating rod, and the second valve plate is provided with a second rotating rod. The first end of the first rotating rod and the first end of the second rotating rod extend out of the cylinder, and the second end of the first rotating rod and the second end of the second rotating rod are rotatably installed on the cylinder. The first valve plate and the second valve plate rotate outward and open under the action of airflow. The cylinder is provided with a transmission mechanism, which is movably arranged in the axial direction of the cylinder. The first end of the first rotating rod and the first end of the second rotating rod are connected to the transmission mechanism so that the opening and closing angles of the first valve plate and the second valve plate can be adjusted according to the air volume.

[0006] In some embodiments, the transmission mechanism has a transmission end and a telescopic end, the two sides of the transmission end engaging with the first end of the first rotating rod and the first end of the second rotating rod respectively, the telescopic end being connected to the cylinder, and the length of the telescopic end being extendable or shortenable.

[0007] In some embodiments, the transmission mechanism includes an electromagnetic component disposed in the direction of movement of the transmission mechanism, and the magnetic force generated by the electromagnetic component acts on the transmission end.

[0008] In some embodiments, the transmission mechanism further includes a rack and a telescopic member connected to each other. The two sides of the rack are respectively engaged with the first end of the first rotating rod and the first end of the second rotating rod. The rack is movably arranged in the axial direction of the cylinder. The end of the telescopic member opposite to the rack is connected to the cylinder. The length of the telescopic member can be extended or shortened.

[0009] In some embodiments, a first gear is fitted onto the first end of the first rotating rod, and a second gear is fitted onto the first end of the second rotating rod. The two sides of the rack mesh with the first gear and the second gear, respectively.

[0010] In some embodiments, mounting holes are respectively provided on the opposite sidewalls of the first valve plate and the second valve plate, the mounting holes being opened longitudinally along the sidewalls, and the first rotating rod and the second rotating rod being respectively installed in the corresponding mounting holes, with the two ends of the first rotating rod and the second rotating rod extending out of the corresponding mounting holes.

[0011] In some embodiments, both the first rotating rod and the second rotating rod include a first rod, a second rod, and an elastic element. The elastic element is installed in the mounting hole, and one end of the first rod and the second rod extends into the mounting hole and is respectively connected to both ends of the elastic element.

[0012] In some embodiments, the top inner wall of the cylinder is provided with a first sliding groove, and the end of the first sliding groove is provided with a limiting through hole; the bottom inner wall of the cylinder is provided with a second sliding groove, and the end of the second sliding groove is provided with a limiting recess; the end of the first rod facing away from the elastic member slides into the limiting through hole along the first sliding groove, and the end of the first rod facing away from the elastic member extends out of the limiting through hole; the end of the second rod facing away from the elastic member slides into the limiting recess along the second sliding groove, and the end of the second rod facing away from the elastic member is installed in the limiting recess. When the ends of the first rod and the second rod that are away from the elastic member are located in the first groove and the second groove respectively, the elastic member is in a compressed state; when the ends of the first rod and the second rod that are away from the elastic member are located in the limiting through hole and the limiting recess respectively, the elastic member is in an extended state.

[0013] An axial flow fan includes a damper and a duct, wherein the damper is the aforementioned damper and the duct is the aforementioned duct body.

[0014] In some embodiments, a guide vane is also included, the outer ring of which is embedded in the air duct. An annular groove is provided at the air outlet of the air duct. The first valve plate and the second valve plate are symmetrically installed in the annular groove. When the first valve plate and the second valve plate close the air outlet of the air duct, the first valve plate and the second valve plate cover the outer ring of the guide vane.

[0015] The air valve and axial flow fan provided by this invention have the following beneficial effects: In this invention, the first and second valve plates are symmetrically installed at the air outlet of the cylinder. This symmetrical arrangement allows the airflow to act evenly on the two valve plates as it passes through the air outlet. The symmetrically installed valve plates can rotate synchronously outward or inward under the action of the airflow, ensuring smooth and consistent opening and closing of the air outlet. The transmission mechanism, connected to the first and second rotating rods, can precisely control the opening and closing angles of the two valve plates. The combination of the symmetrically installed valve plates and the balanced control of the transmission mechanism allows the air valve to maintain good airflow characteristics during operation, while improving the stability and reliability of the system. The transmission mechanism can adjust the opening and closing angle of the valve plates as needed. When the airflow changes, the transmission mechanism can convert linear motion into rotation of the rotating rod through axial movement, thereby adjusting the opening and closing angle of the valve plates. The dynamic adjustment capability of the transmission mechanism allows the opening and closing angle of the valve plates to be not only driven by the airflow but also precisely controlled according to actual needs. The combination of airflow drive and the dynamic adjustment of the transmission mechanism enables the air valve to respond quickly to changes in airflow while also allowing for precise adjustment according to actual needs, improving the flexibility and adaptability of the system. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is an isometric view of the air valve when it is closed according to an embodiment of the present invention; Figure 2 This is a top view of the air valve in an embodiment of the present invention when it is closed; Figure 3 This is a schematic diagram of the air valve being opened according to an embodiment of the present invention; Figure 4 This is a top view of the air valve in an embodiment of the present invention when it is open; Figure 5 This is a schematic diagram of the first valve plate and the second valve plate according to an embodiment of the present invention; Figure 6This is a schematic diagram illustrating the direction of the air valve when it changes from a closed state to an open state according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the direction of the air valve when it changes from an open state to a closed state according to an embodiment of the present invention. Figure 8 This is a schematic diagram showing the positions of the electromagnetic component and the rack in an embodiment of the present invention; Figure 9 This is a schematic diagram of the direction of rotation after the electromagnetic component is activated according to an embodiment of the present invention; Figure 10 The above are isometric views of the first and second members of an embodiment of the present invention. Figure 11 This is a cross-sectional view of the first rod, the second rod, and the elastic element installed in the mounting hole according to an embodiment of the present invention; Figure 12 This is a detailed enlarged view of the elastic element in an embodiment of the present invention; Figure 13 This is a schematic diagram of the first and second slides according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the limiting sinkhole according to an embodiment of the present invention.

[0018] Attached Figures: 1-Cylinder; 101-First Slide Groove; 102-Limiting Through Hole; 103-Second Slide Groove; 104-Limiting Slot; 105-Annular Groove; 2-First Valve Plate; 3-Second Valve Plate; 41-First Rotating Rod; 411-First End of First Rotating Rod; 412-Second End of First Rotating Rod; 413-First Gear; 42-Second Rotating Rod; 421-First End of Second Rotating Rod; 422-Second End of Second Rotating Rod; 423-Second Gear; 401-First Rod; 402-Second Rod; 403-Elastic Component; 5-Transmission Mechanism; 51-Transmission End; 52-Telescopic End; 501-Electromagnetic Component; 502-Rack; 503-Telescopic Component; 6-Guide Vane. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used here to describe the spatial positional relationship of a device or feature as shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device as described in the figure. For example, if a device in the figure is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures.

[0022] See also Figures 1 to 14 As shown, according to an embodiment of the present invention, a wind valve is provided, which includes a cylinder 1, a first valve plate 2, and a second valve plate 3; the first valve plate 2 and the second valve plate 3 are symmetrically installed at the air outlet of the cylinder 1. The first valve plate 2 is provided with a first rotating rod 41, and the second valve plate 3 is provided with a second rotating rod 42. The first end 411 of the first rotating rod 41 and the first end 421 of the second rotating rod 42 extend out of the cylinder 1, respectively. The second end 412 of the first rotating rod 41 and the second end 422 of the second rotating rod 42 are rotatably installed on the cylinder 1, respectively. The first valve plate 2 and the second valve plate 3 rotate outward and open under the action of airflow; a transmission mechanism 5 is provided on the cylinder 1. The transmission mechanism 5 is movably arranged in the axial direction of the cylinder 1. The first end 411 of the first rotating rod 41 and the first end 421 of the second rotating rod 42 are connected to the transmission mechanism 5 so that the opening angle of the first valve plate 2 and the second valve plate 3 can be adjusted according to the air volume. The opening angle here refers to the size of the opening of the first valve plate 2 and the second valve plate 3 relative to the air outlet.

[0023] Specifically, in the initial state, the first valve plate 2 and the second valve plate 3 are in the closed state, the two valve plates are in contact, and the air outlet is closed. The first end 421 of the first rotating rod 41 and the second rotating rod 42 extends out of the cylinder 1 and is connected to the transmission mechanism 5. The second end 422 of the first rotating rod 41 and the second rotating rod 42 is rotatably mounted on the cylinder 1. The transmission mechanism 5 is in the initial position and no external force is applied to the rotating rods. The air valve remains in the closed state. When air enters the cylinder 1, the air blows towards the outlet, specifically towards the first valve plate 2 and the second valve plate 3. The pressure and kinetic energy of the airflow cause the first valve plate 2 and the second valve plate 3 to experience an outward thrust, causing them to rotate outward. Simultaneously, the transmission mechanism 5 moves axially. The rotation of the first rotating rod 41 and the second rotating rod 42 is equivalent to the linear movement of the transmission mechanism 5. This rotation further drives the first valve plate 2 and the second valve plate 3 to rotate outward, opening the outlet. As the airflow increases, the airflow further pushes the first valve plate 2 and the second valve plate 3 to rotate outward until they are fully extended. When the airflow in the cylinder 1 decreases, the transmission mechanism 5 moves axially in the opposite direction. The linear movement of the transmission mechanism 5 is converted into the rotation of the first rotating rod 41 and the second rotating rod 42, causing the first valve plate 2 and the second valve plate 3 to rotate inward, reducing their opening angle. When no more air enters the cylinder 1, the first valve plate 2 and the second valve plate 3 gradually rotate inward under the drive of the rotating rod, and finally fit against the air outlet to close the air outlet.

[0024] In this embodiment, the transmission mechanism 5 achieves precise airflow regulation by controlling the opening and closing angles of the first valve plate 2 and the second valve plate 3. In traditional air valves, the opening and closing angles of the valve plates are usually determined by the airflow magnitude and cannot be automatically adjusted. However, through the transmission mechanism 5, the opening and closing angles of the valve plates can be automatically adjusted according to actual needs, thereby controlling the airflow magnitude. The transmission mechanism 5 ensures that the opening and closing actions of the first valve plate 2 and the second valve plate 3 are synchronized. Since the valve plates are symmetrically installed at the air outlet, the transmission mechanism 5, through its connection with the first rotating rod 41 and the second rotating rod 42, ensures that the two valve plates maintain consistent movements during opening and closing, avoiding airflow turbulence or valve plate damage caused by inconsistent valve plate movements. The axial movement of the transmission mechanism 5 is continuous, enabling smooth adjustment of the valve plate opening and closing angles. This smooth adjustment method avoids sudden impacts or vibrations during the opening and closing of the valve plates, extending the service life of the valve plates and the transmission mechanism 5. The transmission mechanism 5 can dynamically adjust the opening angle of the valve plate according to real-time changes in air volume. When the air volume increases, the valve plate pushes the transmission mechanism 5 to move; when the air volume decreases, the transmission mechanism 5 automatically partially closes the valve plate. This dynamic adjustment capability allows the air valve to adapt to different working conditions, improving the system's flexibility. Furthermore, the transmission mechanism 5 can adjust the opening angle of the valve plate according to the air volume, minimizing airflow resistance as it passes through the air valve. When the air volume is large, the valve plate is fully open, allowing smooth airflow; when the air volume is small, the valve plate is partially closed to prevent eddies or turbulence at the valve plate, thereby improving ventilation efficiency. Through the precise control of the transmission mechanism 5, the opening angle of the valve plate can be optimized according to the airflow distribution, making the airflow more uniform at the outlet.

[0025] In this embodiment, the first valve plate 2 and the second valve plate 3 are symmetrically installed at the air outlet of the cylinder 1. This symmetrical arrangement allows the airflow to act evenly on the two valve plates when passing through the air outlet. The symmetrically installed valve plates can rotate synchronously outward or inward under the action of the airflow, thereby ensuring that the opening and closing action of the air outlet is smooth and consistent. The transmission mechanism 5, through its connection with the first rotating rod 41 and the second rotating rod 42, can precisely control the opening and closing angle of the two valve plates. The combination of the symmetrically installed valve plates and the balance control of the transmission mechanism 5 enables the air valve to maintain good airflow characteristics during operation, while improving the stability and reliability of the system. The transmission mechanism 5 can adjust the opening and closing angle of the valve plate as needed. When the air volume changes, the transmission mechanism 5 can convert linear motion into rotation of the rod through axial movement, thereby adjusting the opening and closing angle of the valve plate. The dynamic adjustment capability of the transmission mechanism 5 allows the opening and closing angle of the valve plate to be not only driven by the airflow, but also precisely controlled according to actual needs. The combination of airflow drive and dynamic adjustment of the transmission mechanism 5 enables the air valve to respond quickly when the airflow changes, while also being able to make precise adjustments according to actual needs, thus improving the flexibility and adaptability of the system.

[0026] It is worth noting that in this embodiment, the transmission mechanism 5 can be moved axially by rotating the first valve plate 2 and the second valve plate 3, utilizing the influence of gravity. Alternatively, the opening and closing angles of the first valve plate 2 and the second valve plate 3 can be adjusted by the transmission mechanism 5 according to the airflow. The transmission mechanism 5 can be implemented by setting a connecting rod and a motor, or by setting a spring, or by setting a spring, gear, and rack structure simultaneously. The configuration of the transmission mechanism 5 must ensure the torque required to close the valve plates.

[0027] See also Figures 1 to 7 As shown, the transmission mechanism 5 has a transmission end 51 and a telescopic end 52. The two sides of the transmission end 51 are respectively engaged with the first end 411 of the first rotating rod 41 and the first end 421 of the second rotating rod 42. The telescopic end 52 is connected to the cylinder 1, and the length of the telescopic end 52 can be extended or shortened.

[0028] Specifically, in the initial state, the first valve plate 2 and the second valve plate 3 are in the closed state, with the two valve plates tightly fitted together, completely sealing the air outlet. The first end 421 of the first rotating rod 41 and the second rotating rod 42 extends out of the cylinder 1 and engages with the transmission end 51 of the transmission mechanism 5. The second end 422 of the first rotating rod 41 and the second rotating rod 42 is rotatably mounted on the cylinder 1. The telescopic end 52 of the transmission mechanism 5 is in the initial position, with the telescopic end 52 at its shortest length. The transmission end 51 engages with the rotating rod, but no external force is applied to the rotating rod, and the valve plates remain in the closed state. When the cylinder 1 begins to intake air, the airflow enters from the fan inlet, passes through the duct, and finally blows onto the first valve plate 2 and the second valve plate 3 at the air outlet. The pressure and kinetic energy of the airflow cause the first valve plate 2 and the second valve plate 3 to be pushed outward, and the valve plates begin to rotate outward. The transmission end 51 engages with the first end 421 of the first rotating rod 41 and the second rotating rod 42, and the rotation of the rotating rod is converted into the movement of the transmission end 51, thereby stretching the telescopic end 52. The rotation of the first rotating rod 41 and the second rotating rod 42 drives the first valve plate 2 and the second valve plate 3 to rotate outward, accelerating the opening of the air outlet. As the air volume increases, the airflow pushes the valve plates, further pushing the valve plates to rotate outward. The rotation of the rotating rod continues to convert the linear movement of the transmission mechanism 5, and the telescopic end 52 of the transmission mechanism 5 continues to extend, ensuring that the valve plates can open smoothly to the maximum. When the air volume reaches the maximum value, the first valve plate 2 and the second valve plate 3 are fully rotated out, the air outlet is fully opened, and the airflow can pass freely. When the airflow in cylinder 1 begins to decrease, the thrust of the airflow on the valve plate also decreases. The telescopic end 52 of the transmission mechanism 5 begins to shorten. The transmission end 51, through engagement with the first end 421 of the first rotating rod 41 and the second rotating rod 42, converts the linear movement of the telescopic end 52 into the reverse rotation of the rotating rod. The reverse rotation of the first rotating rod 41 and the second rotating rod 42 drives the first valve plate 2 and the second valve plate 3 to rotate inward, reducing the opening and closing angle of the valve plates and ensuring that the airflow matches the opening and closing angle of the valve plates. When no more air enters cylinder 1, the thrust of the airflow on the valve plate disappears, and the telescopic end 52 of the transmission mechanism 5 continues to shorten until the valve plate is completely closed. The first rotating rod 41 and the second rotating rod 42, driven by the transmission mechanism 5, gradually rotate inward, causing the first valve plate 2 and the second valve plate 3 to finally fit together, completely sealing the air outlet. At this time, the telescopic end 52 of the transmission mechanism 5 returns to its initial position, and the air valve returns to its initial closed state, waiting for the next air intake.

[0029] In this embodiment, the telescopic end 52 of the transmission mechanism 5 can dynamically extend or shorten according to the air volume. Through the engagement of the transmission end 51 with the rotating rod, the linear motion of the telescopic end 52 is converted into the rotational motion of the rotating rod, thereby precisely controlling the opening and closing angle of the valve plate. This dynamic adjustment capability allows the air valve to adjust the air volume in real time according to actual needs, improving the system's flexibility and adaptability. In workshops, factories, and other places, ventilation needs may change with time and production activities. Through the dynamic adjustment of the transmission mechanism 5, the air valve can quickly adjust the air volume according to actual needs, ensuring that the ventilation effect is always at its best. The extension or shortening of the telescopic end 52 of the transmission mechanism 5 is continuous, enabling smooth adjustment of the valve plate's opening and closing angle. This smooth adjustment method avoids sudden impacts or vibrations to the valve plate during opening and closing, extending the service life of the valve plate and the transmission mechanism 5. The transmission mechanism 5 can dynamically adjust the length of the telescopic end 52 according to real-time changes in air volume, thereby dynamically adjusting the valve plate's opening and closing angle. This dynamic adaptability allows the air valve to respond quickly under different working conditions, ensuring that the air volume matches the valve plate's opening and closing angle.

[0030] See also Figures 1 to 7 As shown, the transmission mechanism 5 includes a rack 502 and a telescopic member 503 connected to each other. The rack 502 is installed on the top of the cylinder 1 and has a certain length. Gear grooves are provided on both sides of the rack 502. The length of the rack 502 is flexibly adjusted according to the opening angle of the valve plate; the greater the opening angle, the longer the rack 502. The two sides of the rack 502 mesh with the first end 411 of the first rotating rod 41 and the first end 421 of the second rotating rod 42, respectively. The rack 502 is movably arranged in the axial direction of the cylinder 1. The end of the telescopic member 503 facing away from the rack 502 is connected to the outer edge of the air outlet of the cylinder 1. The length of the telescopic member 503 can be extended or shortened. In this embodiment, the telescopic member 503 is a spring or a telescopic rod, and the entire transmission mechanism is located near the air outlet of the cylinder 1.

[0031] Specifically, in the initial state, the first valve plate 2 and the second valve plate 3 are in the closed state, and the two valve plates are tightly fitted together, completely sealing the air outlet. The first end 421 of the first rotating rod 41 and the second rotating rod 42 extends out of the cylinder 1 and meshes with the rack 502. The second end 422 of the first rotating rod 41 and the second rotating rod 42 is rotatably mounted on the cylinder 1. The rack 502 is in the initial position in the axial direction of the cylinder 1, and the length of the telescopic member 503 is the shortest. The rack 502 meshes with the rotating rod, but no external force is applied to the rotating rod, and the valve plate remains in the closed state. When the cylinder 1 begins to intake air, the airflow enters from the inlet of the fan, passes through the air duct, and finally blows towards the first valve plate 2 and the second valve plate 3 at the air outlet. The pressure and kinetic energy of the airflow will cause the first valve plate 2 and the second valve plate 3 to be pushed outward, and the valve plates begin to rotate outward. The movement of the rack 502 is converted into the linear movement (to the right) of the rack 502 by meshing with the first end 421 of the first rotating rod 41 and the second rotating rod 42. The first valve plate 2 and the second valve plate 3 rotate outward, accelerating the opening of the air outlet. When the air volume reaches the maximum value, the first valve plate 2 and the second valve plate 3 are completely rotated out, the air outlet is fully opened, and the airflow can pass freely. When the air volume in the cylinder 1 begins to decrease, the thrust of the airflow on the valve plate also decreases, the telescopic component 503 begins to shorten, and the rack 502 moves in the opposite direction in the axial direction of the cylinder 1. The reverse movement of the rack 502, through meshing with the first end 421 of the first rotating rod 41 and the second rotating rod 42, converts the linear movement (to the left) into the reverse rotation of the rotating rod. The reverse rotation of the first rotating rod 41 and the second rotating rod 42 drives the first valve plate 2 and the second valve plate 3 to rotate inward, reducing the opening and closing angle of the valve plate and ensuring that the air volume matches the opening and closing angle of the valve plate.

[0032] In this embodiment, the rack 502 has toothed grooves on both sides, which mesh with the first ends 421 of the first rotating rod 41 and the second rotating rod 42. When the rack 502 moves in the axial direction of the cylinder 1, the linear motion is converted into the rotational motion of the rotating rod through the meshing of the toothed grooves with the rotating rod. This transmission method ensures that the opening and closing angle of the valve plate can be precisely controlled according to the moving position of the rack 502. The meshing of the rack 502 with the first rotating rod 41 and the second rotating rod 42 ensures the synchronous action of the two valve plates. Since the rack 502 drives the two rotating rods simultaneously, the first valve plate 2 and the second valve plate 3 always maintain the same angle during the opening and closing process, avoiding airflow turbulence or valve plate damage caused by inconsistent actions. The movement of the rack 502 is continuous, which can realize the smooth adjustment of the valve plate opening and closing angle. This smooth adjustment method avoids sudden impacts or vibrations of the valve plate during the opening and closing process, and extends the service life of the valve plate and the transmission mechanism 5. The telescopic component 503 (spring or telescopic rod) can be extended or shortened, thereby pushing or pulling the rack 502 to move axially in the cylinder 1. When the telescopic component 503 is extended, the rack 502 moves towards the air outlet, causing the valve plate to rotate outward and open the air outlet. When the telescopic component 503 is shortened, the rack 502 moves in the opposite direction, causing the valve plate to rotate inward, reducing the opening angle or closing the air outlet. If the telescopic component 503 is a spring, the elasticity of the spring can provide a certain buffering effect. When the airflow changes, the spring can absorb the impact force to a certain extent, ensuring the smooth operation of the rack 502 and the rotating rod. The elasticity of the spring can also realize the automatic reset function. When the airflow disappears or the telescopic component 503 loses external force, the spring can automatically pull the rack 502 back to the initial position, so that the valve plate returns to the closed state. This automatic reset function ensures that the air valve can be reliably closed when there is no airflow, improving the safety of the system. The combination of rack 502 and telescopic component 503 enables precise control and dynamic adjustment of the air valve. The extension or shortening of telescopic component 503 precisely controls the opening and closing angle of the valve plate through the movement of rack 502, allowing the air valve to adjust in real time according to changes in air volume. The smooth movement of rack 502 and the elastic buffering effect of telescopic component 503 ensure the smooth operation of the valve plate during opening and closing, reducing mechanical shock and wear, and improving the reliability and durability of the system.

[0033] See also Figures 1 to 9As shown, the transmission mechanism 5 also includes an electromagnetic component 501, which is disposed in the moving direction of the transmission mechanism 5. The magnetic force generated by the electromagnetic component 501 provides a reverse force to the transmission end 51. Specifically, the transmission mechanism 5 includes a rack 502 and a telescopic component 503 connected to each other. The electromagnetic component 501 is disposed opposite to the rack 502, with the electromagnetic component 501 located on the side of the rack 502 away from the telescopic component 503. The telescopic component 503 and the electromagnetic component 501 are located on opposite sides of the telescopic component 503 in the moving direction, and a certain distance is left between the electromagnetic component 501 and the rack 502. The magnetic force generated by the electromagnetic component 501 acts on the rack 502. The rack 502 is made of magnetic material. The end of the rack 502 facing the electromagnetic component 501 is the N pole. The electromagnetic component 501 is an electromagnet. The end of the electromagnetic component 501 facing the rack 502 is the N pole. The electromagnetic component 501 is composed of a coil and an iron block. The magnetism generated by the electromagnetic component 501 is the induced magnetic field generated by the coil being energized. The magnitude of the induced magnetic field can be controlled by the magnitude of the energization of the coil.

[0034] Specifically, when the cylinder 1 starts to take in air, the airflow enters from the inlet of the fan, passes through the air duct, and finally blows towards the first valve plate 2 and the second valve plate 3 at the air outlet. The pressure and kinetic energy of the airflow will cause the first valve plate 2 and the second valve plate 3 to be pushed outward, and the valve plates begin to rotate outward. The movement of the rack 502 is converted into the linear movement (to the right) of the rack 502 by meshing with the first end 421 of the first rotating rod 41 and the second rotating rod 42. During this process, in order to ensure that the first valve plate 2 and the second valve plate 3 can be opened, the electromagnetic component 501 is not energized. When the air volume in cylinder 1 begins to decrease, the thrust of the airflow on the valve plate also decreases, the telescopic component 503 begins to shorten, and the rack 502 moves in the opposite direction (to the left) in the axial direction of cylinder 1. The reverse movement of the rack 502 is converted into the reverse rotation of the rod by meshing with the first end 421 of the first rotating rod 41 and the second rotating rod 42. At the same time, the electromagnetic component 501 is energized to generate magnetic force. The magnetic force (N pole) generated by the electromagnetic component 501 applies a thrust (to the left) to the rack 502, which works together with the tension of the telescopic component 503. The thrust and the tension of the telescopic spring combined are greater than the wind force generated by the rotation of the fan blades. The rack 502 moves to the left, which in turn drives the opening and closing angle of the air valve to decrease. If it is necessary to further reduce the opening and closing angle of the air valve, the magnetism generated by the electromagnetic component 501 can be increased accordingly.

[0035] In this embodiment, when the airflow changes, the telescopic movement of the telescopic component 503 and the magnetic force generated by the electromagnetic component 501 work together to enable the rack 502 to move precisely, thereby accurately controlling the opening and closing angle of the valve plate. By adjusting the magnetic force of the electromagnetic component 501 (by controlling the energizing current of the coil), the opening and closing angle of the valve plate can be finely adjusted to ensure precise airflow control. When the airflow suddenly increases or decreases, the telescopic component 503 can quickly extend or retract, the rack 502 can move rapidly, and the opening and closing angle of the valve plate can be quickly adjusted, ensuring that the system can quickly respond to changes in airflow. Through the magnetic force adjustment of the electromagnetic component 501, the system can flexibly adjust the opening and closing angle of the valve plate according to different operating conditions (such as different airflow requirements, different environmental conditions, etc.), improving the adaptability of the system. When either the telescopic component 503 or the solenoid component 501 malfunctions, the valve plate can still partially open under the action of airflow, but the opening and closing angle cannot be precisely controlled. The solenoid component 501 can provide additional reverse force when needed to ensure that the valve plate can reliably close, improving system safety. The combination of the solenoid component 501 and the telescopic component 503 provides redundancy; even if one component fails, the other component can still partially complete the adjustment function, ensuring basic system operation. Through the magnetic force of the solenoid component 501 and the smooth extension and retraction of the telescopic component 503, the movement of the rack 502 is more stable, reducing wear between mechanical parts. This smooth operation extends the service life of the rack 502, the rotating rod, and the solenoid component 501, reducing maintenance costs.

[0036] See also Figures 1 to 9 As shown, the first end 411 of the first rotating rod 41 is fitted with the first gear 413, the first end 421 of the second rotating rod 42 is fitted with the second gear 423, and the two sides of the rack 502 mesh with the first gear 413 and the second gear 423 respectively.

[0037] Specifically, when the cylinder 1 starts to take in air, the airflow enters from the inlet of the fan, passes through the air duct, and finally blows towards the first valve plate 2 and the second valve plate 3 at the air outlet. The movement of the rack 502 is converted into the movement of the rack 502 by meshing with the first gear 413 and the second gear 423. The rotation of the first rotating rod 41 and the second rotating rod 42 is converted into the movement of the rack 502. The rack 502 moves in the axial direction of the cylinder 1, and the telescopic member 503 begins to extend. During this stage, the electromagnetic member 501 is not energized and does not generate magnetic force. When the air volume in the cylinder 1 begins to decrease, the thrust of the airflow on the valve plate also decreases, the telescopic member 503 begins to shorten, and the rack 502 moves in the opposite direction (to the left) in the axial direction of the cylinder 1. The reverse movement of the rack 502, through meshing with the first gear 413 and the second gear 423, converts the linear movement into the reverse rotation of the gears. The reverse rotation of the first gear 413 and the second gear 423 respectively drives the first rotating rod 41 and the second rotating rod 42 to rotate in the opposite direction, thereby driving the first valve plate 2 and the second valve plate 3 to rotate inward, reducing the opening and closing angle of the valve plate.

[0038] In this embodiment, the meshing transmission between the gear and the rack 502 can accurately convert the linear motion of the rack 502 into the rotational motion of the rod. This transmission method ensures that the opening and closing angle of the valve plate can be precisely controlled according to the moving position of the rack 502. By adjusting the moving distance of the rack 502, the opening and closing angles of the first valve plate 2 and the second valve plate 3 can be precisely controlled, thereby achieving precise adjustment of the air volume.

[0039] See also Figures 1 to 10 As shown, mounting holes are respectively provided on the opposite sidewalls of the first valve plate 2 and the second valve plate 3. The mounting holes are opened along the longitudinal direction of the sidewalls. The first rotating rod 41 and the second rotating rod 42 are respectively installed in the corresponding mounting holes, and the two ends of the first rotating rod 41 and the second rotating rod 42 extend out of the corresponding mounting holes.

[0040] In this embodiment, the mounting hole is opened longitudinally along the side wall to ensure that the first rotating rod 41 and the second rotating rod 42 can be accurately installed on the side wall of the valve plate. This precise installation method makes the valve plate more stable during rotation and avoids shaking or jamming caused by insecure installation. The two ends of the rotating rod extend out of the mounting hole, providing additional support points. This setting allows the valve plate to be evenly stressed during rotation, reducing deformation or damage caused by uneven stress. The first end 421 of the first rotating rod 41 and the second rotating rod 42 are respectively fitted with the first gear 413 and the second gear 423. The two sides of the rack 502 mesh with the first gear 413 and the second gear 423 respectively. This arrangement allows the linear motion of the rack 502 to be accurately converted into the rotational motion of the rotating rod, thereby achieving precise control of the opening and closing angle of the valve plate. Since the first rotating rod 41 and the second rotating rod 42 are respectively installed in the corresponding mounting holes and extend at both ends, this arrangement ensures the synchronous action of the first valve plate 2 and the second valve plate 3. The two valve plates always maintain the same angle during the opening and closing process, avoiding airflow turbulence or valve plate damage caused by inconsistent actions.

[0041] See also Figures 1 to 12 As shown, both the first rotating rod 41 and the second rotating rod 42 include a first rod 401, a second rod 402, and an elastic element 403. The elastic element 403 is a spring and is installed in the mounting hole. One end of the first rod 401 and the second rod 402 extends into the mounting hole and is connected to both ends of the elastic element 403, respectively. The first rod 401 is positioned above the second rod 402. The other ends of the first rod 401 and the second rod 402 extend out of the mounting hole and are rotatably connected to the cylinder 1.

[0042] Specifically, during the installation of the first rotating rod 41 and the second rotating rod 42, the elastic element 403 is compressed in the mounting hole, and the ends of the first rod 401 and the second rod 402 are retracted or partially retracted in the mounting hole. After the valve plate is installed in place, the elasticity of the elastic element 403 is released, and the ends of the first rod 401 and the second rod 402 extend out of the mounting hole and are rotatably connected to the cylinder 1.

[0043] In this embodiment, the elastic properties of the elastic element 403 enable the first rod 401 and the second rod 402 to automatically adjust their positions during installation, ensuring that the rods can smoothly extend and connect with the cylinder 1 after the valve plate is installed in place. This adaptive adjustment reduces installation errors and improves system reliability. The first rod 401 and the second rod 402 are connected to the valve plate through the elastic element 403, and their ends extend out of the mounting holes and are rotatably connected to the cylinder 1. This design ensures that the valve plate is evenly stressed during rotation, reducing swaying or jamming caused by uneven stress. The buffering effect of the elastic element 403 reduces direct friction between the valve plate and the rotating rod, extending the service life of the valve plate and the rotating rod. After the ends of the first rod 401 and the second rod 402 extend out of the mounting holes, they can precisely mesh with gears or other transmission components on the cylinder 1. This precise transmission control ensures that the opening and closing angle of the valve plate can be precisely adjusted as needed.

[0044] As a specific implementation, since the rotation of the first rotating rod 41 and the second rotating rod 42 is converted into the linear movement of the rack 502, the cross-sections of the first rod 401 and the second rod 402 are rectangular or other irregular structures. Similarly, the structural shape of the mounting hole is adapted to the shape of the rod. After this setting, the first rod 401 and the second rod 402 will not rotate relative to each other after being installed in the mounting hole.

[0045] See also Figures 1 to 14As shown, the inner wall of the top of the cylinder 1 is provided with a first sliding groove 101, and the end of the first sliding groove 101 is provided with a limiting through hole 102. The inner wall of the bottom of the cylinder 1 is provided with a second sliding groove 103, and the end of the second sliding groove 103 is provided with a limiting recess 104. The end of the first rod 401 facing away from the elastic member 403 slides along the first sliding groove 101 into the limiting through hole 102, and the end of the first rod 401 facing away from the elastic member 403 extends out of the limiting through hole 102; the end of the second rod 402 facing away from the elastic member 403 slides along the first sliding groove 101 into the limiting through hole 102. The second slide 103 slides into the limiting groove 104, and the end of the second rod 402 facing away from the elastic member 403 is installed in the limiting groove 104. When the ends of the first rod 401 and the second rod 402 facing away from the elastic member 403 are respectively located in the first slide 101 and the second slide 103, the elastic member 403 is in a compressed state. When the ends of the first rod 401 and the second rod 402 facing away from the elastic member 403 are respectively located in the limiting through hole 102 and the limiting groove 104, the elastic member 403 is in an extended state.

[0046] Specifically, the end of the first rod 401 facing away from the elastic member 403 slides along the first groove 101 on the inner wall of the top of the cylinder 1. When the first rod 401 slides to the end of the first groove 101, its end enters the limiting through hole 102 and protrudes from the limiting through hole 102. The cylinder 1 is provided with a corresponding hole. The end of the first rod 401 protrudes from the cylinder 1 and connects with the corresponding gear. The gear meshes with the rack 502. Similarly, the end of the second rod 402 facing away from the elastic member 403 slides along the second groove 103 on the inner wall of the bottom of the cylinder 1. When the second rod 402 slides to the end of the second groove 103, its end enters the limiting recess 104 and does not protrude from the cylinder 1. When the first rod 401 and the second rod 402 are respectively located in the limiting through hole 102 and the limiting recess 104, the elastic member 403 is in an extended state.

[0047] In this embodiment, the first slide groove 101 and the second slide groove 103 respectively guide the sliding of the first rod 401 and the second rod 402, ensuring that they can accurately move along a predetermined path into the limiting through hole 102 and the limiting groove 104. This guiding mechanism reduces alignment errors during installation and improves installation accuracy. The limiting through hole 102 and the limiting groove 104 respectively fix the ends of the first rod 401 and the second rod 402, ensuring that they can be stably connected to the cylinder 1 or other components after installation. The limiting through hole 102 allows the end of the first rod 401 to extend out of the cylinder 1 and connect with other components (such as gears), while the limiting groove 104 ensures that the end of the second rod 402 is stably installed inside the cylinder 1. When the first rod 401 and the second rod 402 are respectively located in the first slide groove 101 and the second slide groove 103, the elastic element 403 is in a compressed state, providing stable support force. When the first rod 401 and the second rod 402 slide into the limiting through hole 102 and the limiting recess 104 respectively, the elastic element 403 is in an extended state, further providing a buffering effect. The elastic characteristics of the elastic element 403 enable the first rod 401 and the second rod 402 to automatically adjust their positions during installation, ensuring that after the valve plate is installed in place, the rod can extend smoothly and connect with the cylinder 1. This adaptive adjustment reduces installation errors and improves the reliability of the system.

[0048] An axial flow fan includes a damper and a duct, wherein the damper is the aforementioned damper and the duct is a cylinder 1.

[0049] Existing axial flow fans consist of a motor, a fan casing, impellers, and a valve. Traditionally, the motor and impellers are fixed inside the fan casing, which is then positioned in the mounting hole. The valve is then positioned on the outlet side, and the fan casing and valve are secured to the mounting surface with screws. This installation method is cumbersome and requires multiple people to work together. In this embodiment, the fan casing is the casing 1, meaning the valve is integrated within it. In this embodiment, the first valve plate 2 and the second valve plate 3 rotate in opposite directions. Traditional axial flow fans typically require a separate valve casing for the valve, increasing overall complexity and size. This embodiment integrates the valve directly into the fan casing, reducing the need for a separate valve casing and making the entire fan structure more compact. By shortening the overall length of the axial flow fan, this design is particularly suitable for installation in space-constrained environments, such as narrow ducts, small equipment rooms, or compact ventilation systems. The integrated design also reduces the space occupied during installation, improving space utilization. Because the number of components such as air valve covers is reduced, the number of parts that need to be inspected and replaced during maintenance is also reduced, which reduces the complexity and cost of maintenance. Since the air valves are directly integrated into the air duct, the airflow path is smoother when passing through the fan, reducing airflow resistance caused by components such as air valve covers and improving ventilation efficiency.

[0050] See also Figures 1 to 14 As shown, it also includes a guide vane 6. The outer ring of the guide vane 6 is embedded in the air duct. An annular groove 105 is provided at the air outlet of the air duct. A stepped surface is formed between the annular groove 105 and the inner wall surface of the air duct. The first valve plate 2 and the second valve plate 3 are symmetrically installed in the annular groove 105. When the first valve plate 2 and the second valve plate 3 close the air outlet of the air duct, the first valve plate 2 and the second valve plate 3 cover the outer ring of the guide vane 6.

[0051] In this embodiment, when the first valve plate 2 and the second valve plate 3 close the air outlet, they fit tightly against the stepped surface of the annular groove 105, simultaneously covering the outer ring of the guide vane 6. This arrangement effectively prevents airflow leakage, ensuring the fan's sealing performance in the off state. By installing the valve plates in the annular groove 105 and covering the outer ring of the guide vane 6, airflow leakage caused by the gap between the valve plates and the guide vane 6 can be reduced, improving the overall sealing performance of the system. Integrating the guide vane 6 and valve plates within the air duct reduces additional components and connection points, making the entire fan setup simpler. This simplified setup reduces manufacturing and assembly costs, as well as maintenance costs, because fewer components need to be inspected and replaced.

[0052] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A damper, characterized in that The utility model relates to a valve structure of air outlet, including: cylinder (1), first valve piece (2) and second valve piece (3); The first valve piece (2) and the second valve piece (3) are symmetrically installed at the air outlet of the cylinder (1), the first valve piece (2) is provided with first rotary rod (41), the second valve piece (3) is provided with second rotary rod (42), the first end (411) of the first rotary rod (41) and the first end (421) of the second rotary rod (42) respectively extend the cylinder (1), the second end (412) of the first rotary rod (41) and the second end (422) of the second rotary rod (42) are rotatably installed on the cylinder (1), and the first valve piece (2) and the second valve piece (3) are opened under the action of air flow and rotate outwardly; The cylinder (1) is provided with transmission mechanism (5), the transmission mechanism (5) is movably arranged in the axial direction of the cylinder (1), and the first end (411) of the first rotary rod (41) and the first end (421) of the second rotary rod (42) are in transmission connection with the transmission mechanism (5), so that the opening and closing angle of the first valve piece (2) and the second valve piece (3) can be adjustably arranged according to the size of air volume.

2. The damper according to claim 1, wherein The transmission mechanism (5) has a transmission end (51) and a telescopic end (52), the transmission end (51) is meshed with the first end (411) of the first rotary rod (41) and the first end (421) of the second rotary rod (42) on both sides respectively, the telescopic end (52) is connected with the cylinder (1), and the length of the telescopic end (52) can be extended or shortened.

3. The damper according to claim 2, wherein The transmission mechanism (5) includes an electromagnetic member (501), the electromagnetic member (501) is arranged in the moving direction of the transmission mechanism (5), and the magnetic force generated by the electromagnetic member (501) acts on the transmission end (51).

4. The damper according to claim 2, wherein The transmission mechanism (5) further includes a rack (502) and a telescopic member (503) connected with each other, the rack (502) is meshed with the first end (411) of the first rotary rod (41) and the first end (421) of the second rotary rod (42) on both sides respectively, and the rack (502) is movably arranged in the axial direction of the cylinder (1); one end of the telescopic member (503) away from the rack (502) is connected with the outer edge at the air outlet of the cylinder (1), and the length of the telescopic member (503) can be extended or shortened.

5. The damper according to claim 4, wherein The first end (411) of the first rotary rod (41) is sleeved with a first gear (413), the first end (421) of the second rotary rod (42) is sleeved with a second gear (423), and the rack (502) is meshed with the first gear (413) and the second gear (423) on both sides respectively.

6. The damper according to claim 1, wherein The opposite side walls of the first valve piece (2) and the second valve piece (3) are respectively provided with mounting holes, the mounting holes are arranged along the longitudinal direction of the side wall, the first rotary rod (41) and the second rotary rod (42) are respectively arranged in the corresponding mounting holes, and the two ends of the first rotary rod (41) and the second rotary rod (42) extend out of the corresponding mounting holes.

7. The damper according to claim 6, wherein The first rotating rod (41) and the second rotating rod (42) each comprise a first rod (401), a second rod (402) and an elastic member (403), the elastic member (403) is installed in the mounting hole, one end of the first rod (401) and the second rod (402) extends into the mounting hole and is connected with two ends of the elastic member (403) respectively.

8. The damper according to claim 7, wherein The top inner wall of the cylinder (1) is provided with a first sliding groove (101), the end of the first sliding groove (101) is provided with a limiting through hole (102), the bottom inner wall of the cylinder (1) is provided with a second sliding groove (103), the end of the second sliding groove (103) is provided with a limiting groove (104), one end of the first rod (401) away from the elastic member (403) slides into the limiting through hole (102) along the first sliding groove (101), one end of the first rod (401) away from the elastic member (403) extends out of the limiting through hole (102); one end of the second rod (402) away from the elastic member (403) slides into the limiting groove (104) along the second sliding groove (103), one end of the second rod (402) away from the elastic member (403) is installed in the limiting groove (104); When one end of the first rod (401) and the second rod (402) away from the elastic member (403) is located in the first sliding groove (101) and the second sliding groove (103) respectively, the elastic member (403) is in a compressed state; when one end of the first rod (401) and the second rod (402) away from the elastic member (403) is located in the limiting through hole (102) and the limiting groove (104) respectively, the elastic member (403) is in an elongated state.

9. An axial flow fan comprising a wind scoop and a wind tunnel, characterised in that, The air valve is the air valve of any one of claims 1 to 8, and the air duct is the cylinder (1).

10. The axial fan of claim 9, wherein, Further comprising a guide vane (6), an outer ring of the guide vane (6) is embedded in the air duct, the air duct is provided with a ring groove (105) at an air outlet, the first valve plate (2) and the second valve plate (3) are symmetrically installed in the ring groove (105), when the first valve plate (2) and the second valve plate (3) close the air outlet of the air duct, the first valve plate (2) and the second valve plate (3) cover the outer ring of the guide vane (6).

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