Anti-backflow air check valve

Abstract

The invention relates to an anti-backflow air check valve, and relates to the technical field of air valves. The two ends of the shell are open, the valve plate is rotationally connected into the shell through a rotating shaft, the valve plate can block the shell, the rotating shaft is connected with a connecting rod, the connecting rod is perpendicular to the rotating shaft, and a balancing weight is fixed to the end, close to the rotating shaft, of the connecting rod. The valve plate abuts against the inner wall of the shell and is used for blocking the shell, and when the end, connected with the balancing weight, of the connecting rod is higher than the other end of the connecting rod, the valve plate is separated from the inner wall and used for opening the shell. The gravity of the balancing weight is used as auxiliary force, it is ensured that the valve plate can be tightly closed when no airflow exists or airflow flows backwards slightly, and airflow flows backwards are prevented.

Description

Technical Field

[0001] The present application relates to the field of air valves, and in particular to an anti-backflow check air valve. Background Art

[0002] At present, air valves are widely used in various industrial and civil ventilation systems to achieve directional flow and regulation of gas. Traditional check valves mainly rely on mechanical springs or magnetic devices to achieve one-way flow, but their stability and sealing are often challenged when facing high-pressure backflow or instantaneous airflow impact.

[0003] Traditional air valve designs mostly use mechanical springs or magnetic force to maintain the closure of the valve. When positive airflow passes through, the valve is opened by the air pressure; when reverse airflow or pressure decreases, the valve is closed by the spring or magnetic force. When faced with sudden backflow of air or system pressure fluctuations, traditional air valves may cause backflow of air due to delayed response or insufficient force, thus affecting the safety and stability of the entire ventilation system, so there is room for improvement. Contents of the invention In order to improve the problem of air flow backflow caused by the reaction lag of the spring or the insufficient strength of the magnetic force, the present application provides an anti-backflow check valve.

[0004] The anti-backflow check air valve provided in this application adopts the following technical solution: A backflow prevention check air valve, comprising: A shell, wherein both ends of the shell are open; A valve plate, rotatably connected to the housing via a rotating shaft, and the valve plate can seal the housing; A connecting rod, wherein the connecting rod is connected to the rotating shaft, the connecting rod is perpendicular to the rotating shaft, a counterweight block is fixed on one end of the connecting rod close to the rotating shaft, when one end of the connecting rod connected to the counterweight block is lower than the other end of the connecting rod, the valve plate abuts against the inner wall of the shell to seal the shell, and when one end of the connecting rod connected to the counterweight block is higher than the other end, the valve plate is separated from the inner wall to open the shell.

[0005] By adopting the above technical solution, in the initial state, the circumferential side wall of the valve plate abuts against the inner wall of the shell, thereby blocking the shell and making the two ends of the shell not connected. At this time, one end of the connecting rod hanging a counterweight block tilts downward under the action of the counterweight block. When in use, the wind enters from the opening at one end of the shell, which is a positive airflow. When the gas flows to the valve plate, a thrust is applied to the valve plate. Among them, the connecting rod uses the connection between the connecting rod and the rotating shaft as a fulcrum to form a lever mechanism. When one end of the connecting rod connected to the counterweight block is used as a power arm, it is shorter and requires greater power. The thrust of the airflow is to realize the flipping of the valve plate. The airflow force needs to overcome the gravity of the counterweight block and the force of the lever mechanism to push the valve plate to open, that is, the circumferential side wall of the valve plate is separated from the inner wall of the shell, so that the gas can flow from the gap between the valve plate and the inner wall of the shell to the other end of the shell.

[0006] When there is no airflow or gas enters from the other end of the shell, it is reverse airflow. The counterweight quickly drives one end of the connecting rod to tilt downward under the action of gravity. At this time, the valve plate is in a closed state. The gravity of the counterweight acts as an auxiliary force, making it difficult to lift the end of the connecting rod connected to the counterweight, making it difficult to rotate the connecting rod, increasing the tightness of the valve plate blocking the shell and preventing backflow of airflow. The gravity of the counterweight provides a continuous closing force for the valve plate, enhancing the stability of the air valve under conditions of no airflow or weak airflow.

[0007] The end of the connecting rod connected to the counterweight is close to the fulcrum of the lever mechanism, so that the section of the connecting rod connected to the counterweight as a power arm is shorter and requires more power, making it inconvenient to lift this section of the connecting rod, thereby amplifying the resistance to the rotation of the connecting rod, causing the valve plate to fit tightly against the inner wall of the shell, thereby achieving the stability of the valve body's closure and further preventing backflow of airflow.

[0008] Optionally, the valve plate includes two baffles arranged opposite to each other, and when the two baffles are in the same plane, they are used to seal the shell, and the rotating shaft includes a rotating rod and a transmission rod, and the rotating rod and the transmission rod are arranged along the width direction of the shell, one of the baffles is fixed to the rotating rod, and the other baffle is fixed to the transmission rod, and the rotating rod and the transmission rod are connected by a transmission assembly, and the transmission assembly is used to control the rotating rod and the transmission rod to rotate synchronously to drive the two baffles to approach or move away from each other, and one end of the rotating rod extends out of the shell and is fixed to the connecting rod.

[0009] By adopting the above technical solution, when a positive airflow is introduced into the shell, the baffle is thrusted to overcome the force of the counterweight and the lever mechanism, driving the rotating rod to drive the connecting rod to rotate. Driven by the transmission assembly, the transmission rod and the rotating rod rotate synchronously, so that the two baffles are separated from the shell at the same time to open the valve plate. When the airflow is reverse or stops, the gravity of the counterweight and the amplification effect of the lever mechanism jointly force the valve plate to close tightly to prevent the backflow of airflow. The setting of the two baffles prevents the valve plate from rotating 360°, so that the connecting rod will not maintain a vertical state and cannot achieve the effect of the lever mechanism, affecting the use effect.

[0010] Optionally, the transmission assembly includes: A rotating gear is coaxially sleeved on the rotating rod and fixed to the rotating rod; The transmission gear is coaxially sleeved on the transmission rod and fixed to the transmission rod, and the transmission gear is meshed with the rotating gear.

[0011] By adopting the above technical solution, when the positive airflow exerts force on one of the baffles, the baffle flips, that is, the rotating rod or the transmission rod rotates. Due to the meshing transmission of the rotating gear and the transmission gear, the rotating rod and the transmission rod rotate synchronously, thereby driving the two baffles to approach or move away from each other by the same distance at the same time, ensuring that the two baffles are simultaneously against the inner wall of the shell, thereby achieving instant closure of the valve plate and preventing backflow of airflow.

[0012] Optionally, the housing is provided with a limit assembly for limiting the rotation angle of the rotating rod and the transmission rod, and the limit assembly includes: A moving frame is slidably connected to the housing, one end of the rotating rod and the transmission rod are both inserted through the housing and inserted into the moving frame, and can move relatively in the moving frame; A rotating block, wherein the rotating block is fixed to the side wall of the rotating rod, a rotating hole is opened on the inner wall of one side of the moving frame, and the rotating block is inserted into the rotating hole and can rotate in the rotating hole; A transmission block is fixed to the side wall of the transmission rod, a transmission hole is opened on the inner wall of the other side of the moving frame, and the transmission block is inserted in the transmission hole and can rotate in the transmission hole.

[0013] By adopting the above technical solution, when the baffle is flipped, the rotating rod and the transmission rod both rotate, so that the rotating block is displaced around the circumferential trajectory of the rotating rod, and the transmission block is displaced around the circumferential trajectory of the transmission rod. In this process, the rotating block abuts against the inner wall of the rotating hole, thereby applying a resisting thrust to the inner wall of the mounting hole, and the transmission block applies a resisting thrust to the inner wall of the transmission hole. Since the rotating rod and the transmission rod rotate in opposite directions, that is, the displacement directions of the rotating block and the transmission block are opposite, but the rotating block and the transmission block are located on both sides of the moving frame, so that the moving block is subjected to the thrust in the same direction, thereby realizing the sliding of the moving frame on the shell. The moving tracks of the rotating block and the transmission block are arc-shaped. Restricted by the rotating hole and the transmission hole, the moving distance of the rotating block and the transmission block is limited, thereby limiting the rotation angle of the rotating rod and the transmission rod, so that when the two baffles approach each other, they will not directly collide with each other, thereby increasing the stability of the valve plate structure. The restriction of the rotation angle of the rotating rod also prevents the connecting rod from rotating to a vertical state, so that the counterweight block will not be vertically downward, ensuring that the baffle can always be affected by the lever mechanism.

[0014] Optionally, one end of the movable frame is connected to a weighted ball via a connecting rope, a support plate is fixed on the shell, the weighted ball can be placed on the support plate, the movable frame can move on the support plate, and when the movable frame moves in the direction of the weighted ball, it is used to drive a baffle to seal the shell, and the shell is provided with a movable component for driving the weighted ball to be placed on the support plate.

[0015] By adopting the above technical solution, when the moving frame moves in the direction away from the support plate, the two baffles are in a state of approaching each other, so that the valve plate is opened. During this process, the weighted ball is placed on the support plate, so that the gravity of the weighted ball will not affect the movement of the moving frame, that is, it will not add a large resistance to the opening of the valve plate. When there is no airflow or reverse airflow, under the action of the lever mechanism, the rotating rod rotates to make the moving frame move in the direction of the support plate, and pushes the weighted ball on the support plate away from the support plate, and the weighted ball loses support and falls, thereby driving the connecting rope to drive the moving frame to move quickly, increasing the rotation speed of the rotating rod and the transmission rod, so that the two baffles are close to each other, and the lever mechanism is assisted to enable the valve plate to close quickly and tightly when facing reverse airflow, effectively preventing airflow backflow.

[0016] The weighted ball finally falls onto the moving assembly, and the moving assembly moves the weighted ball back to the support plate for subsequent opening of the valve plate.

[0017] Optionally, the mobile component includes: A cylinder, disposed on the housing; A movable plate is arranged on the output end of the cylinder, the cylinder is used to drive the movable plate to move towards or away from the support plate, a receiving hole is formed through the movable plate, a plurality of receiving bars are hinged on the inner wall of the receiving hole through a torsion spring, the torsion spring is used to drive the receiving bar to tilt upward, the weighted ball can be inserted into the receiving hole and drive the receiving bar to tilt downward; A photoelectric sensor is arranged on the movable plate. The photoelectric sensor is connected to the cylinder signal. The transmitting end and the receiving end of the photoelectric sensor are arranged symmetrically with the central axis of the accommodating hole. When the receiving strip is inserted between the transmitting end and the receiving end, the photoelectric sensor is used to control the start of the cylinder.

[0018] By adopting the above technical solution, when the valve plate is closed, the moving frame moves on the support plate, pushes the weighted ball onto the moving plate, and after it is inserted into the receiving hole, the valve plate is closed. The weighted ball applies downward pressure to the receiving bar in the receiving hole, thereby deforming the torsion spring, driving the receiving bar to rotate downward with the torsion spring as the axis, until the end of the receiving bar away from the torsion spring passes through the receiving hole and tilts downward. At this time, the receiving bar is inserted between the transmitting end and the receiving end of the photoelectric sensor, so that the light emitted by the transmitting end is blocked by the receiving bar, so that the receiving end cannot receive the light, and then the photoelectric sensor transmits a signal, driving the cylinder to start, so that the moving plate moves up to the support plate with the weighted ball, and the weighted ball is moved from the moving plate to the support plate, and the connecting rope is stacked.

[0019] At this time, the receiving bar loses its squeezing force, and the torsion spring recovers its deformation, causing the receiving bar to tilt upward again, so that there is no obstruction between the transmitting end and the receiving end of the photoelectric sensor, that is, the receiving end can receive the light emitted by the transmitting end, and drive the cylinder to drive the moving plate downward, thereby resetting the moving plate and the weighted ball. When the valve plate needs to be opened next time, the moving frame moves away from the support plate, so that the accumulated connecting ropes are continuously stretched without pulling the weighted ball to move, so that the weighted ball will not cause resistance interference to the opening of the valve plate, which is convenient for the subsequent rotation of the two baffles.

[0020] Optionally, a plurality of abutment blocks are fixed on the bottom wall of the movable plate, and the plurality of abutment blocks correspond to the receiving bars one by one, and the receiving bars can abut against the abutment blocks.

[0021] By adopting the above technical solution, when the weighted ball is embedded in the accommodating hole, the weighted ball squeezes the receiving bar, causing the torsion spring to deform, driving the receiving bar to gradually rotate in the direction of the center axis of the accommodating hole, and then gradually rotate in the direction away from the center axis of the accommodating hole after passing through the accommodating hole. At this time, the receiving bar rotates to the bottom of the movable plate, and when the receiving bar abuts against the abutment block, the abutment block restricts the receiving bar from continuing to move in the direction away from the center axis of the accommodating hole, so that the receiving bar maintains an inclined state, thereby making several receiving bars present a trumpet shape with the opening facing upward, which is convenient for supporting the weighted ball in the accommodating hole and prevents the weighted ball from falling off the movable plate.

[0022] Optionally, a fixed plate is fixed on the output end of the cylinder, and the movable plate is connected to the fixed plate via a connecting spring.

[0023] By adopting the above technical solution, after the weighted ball falls onto the moving plate, the moving plate is forced to move downward, causing the connecting spring to compress and deform, thereby offsetting the impact of the weighted ball, playing a role of shock absorption and buffering, making the moving plate less likely to be damaged and extending its service life. At the same time, the connecting spring allows the moving plate to float on the fixed plate, thereby facilitating the rotation of the receiving bar and making the photoelectric sensor less likely to be compressed.

[0024] Optionally, a limit block is provided on the support plate, and when the movable plate moves upward, the side of the top wall of the movable plate close to the support plate can abut against the limit block to drive the side of the movable plate close to the support plate to tilt downward.

[0025] By adopting the above technical solution, when the cylinder drives the fixed plate to move up, thereby driving the movable plate and the weighted ball to move to the support plate, the top wall of the movable plate abuts against the limit block, and the limit block plays a limiting role, so that the side of the movable plate close to the support plate cannot move up, while the fixed plate is still moving up, so that the fixed plate squeezes the part of the connecting spring close to the support plate, and the rest of the movable plate moves up under the push of the fixed plate, so that the movable plate finally tilts in the direction of the support plate, specifically, the end of the movable plate close to the support plate is lower than the end of the movable plate away from the support plate, at this time, the top wall of the movable plate forms a guide surface, so that the weighted ball can roll down the movable plate to the support plate without manual handling. When the weighted ball leaves the movable plate, the photoelectric sensor drives the cylinder to reset, so that the movable plate is located below the support plate again, so as to receive the subsequent falling weighted ball.

[0026] Optionally, a limiting plate is fixed to a side of the movable plate and the supporting plate away from the shell.

[0027] By adopting the above technical solution, the limit plate plays a limiting role, making it difficult for the weighted ball to flip over when placed on the moving plate and the supporting plate, ensuring that the weighted ball can achieve the effect of accelerating the closing of the valve plate and not affecting the opening of the valve plate.

[0028] In summary, the present application includes at least one of the following beneficial effects: 1. When the positive airflow passes through, the airflow force overcomes the gravity of the counterweight block and the force of the lever mechanism, pushing the valve plate to open. When the reverse airflow or airflow stops, the gravity of the counterweight block and the amplification effect of the lever mechanism jointly cause the valve plate to close tightly; 2. When the positive airflow exerts force on one of the baffles, the baffle flips, that is, the rotating rod or the transmission rod rotates. Due to the meshing transmission of the rotating gear and the transmission gear, the rotating rod and the transmission rod rotate synchronously, thereby driving the two baffles to move away from each other by the same distance at the same time, ensuring that the two baffles are against the inner wall of the shell at the same time, realizing the instant closure of the valve plate and preventing the backflow of airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the anti-backflow check air valve according to an embodiment of the present application; Figure 2 It is a structural schematic diagram of the connection relationship between the limit assembly and the valve plate; Figure 3 It is a schematic diagram of the structure on the side wall of the shell; Figure 4 It is a schematic diagram of the structure of the movable plate and the fixed plate.

[0030] In the figure: 10, shell; 11, support plate; 111, limit block; 20, valve plate; 21, baffle; 30, rotating shaft; 31, rotating rod; 32, transmission rod; 40, connecting rod; 41, counterweight; 50, transmission assembly; 51, rotating gear; 52, transmission gear; 60, limit assembly; 61, moving frame; 611, rotating hole; 612, transmission hole; 613, connecting rope; 6131, weighted ball; 62, rotating block; 63, transmission block; 70, moving assembly; 71, cylinder; 72, moving plate; 721, accommodating hole; 722, abutment block; 73, torsion spring; 74, receiving strip; 75, photoelectric sensor; 751, transmitting end; 752, receiving end; 80, fixing plate; 90, connecting spring; 110, limit plate. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The present application embodiment discloses a backflow prevention check valve. Figure 1 and Figure 2 The backflow prevention check valve includes a shell 10 with two ends connected. The shell 10 is placed horizontally, and a valve plate 20 is inserted in the shell 10. The valve plate 20 includes two baffles 21 arranged up and down. The baffles 21 are semicircular and are symmetrically arranged with the central axis of the shell 10 in the width direction as the axis.

[0033] Reference Figure 1 and Figure 2 , a rotating rod 31 is passed through the straight side of one baffle 21, and the rotating rod 31 is fixed to the baffle 21, and a transmission rod 32 is passed through the straight side of the other baffle 21, and the transmission rod 32 is fixed to the baffle 21. The rotating rod 31 and the transmission rod 32 are parallel to each other, and the ends of the rotating rod 31 and the transmission rod 32 are both rotatably connected to the housing 10. The rotating rod 31 and the transmission rod 32 can drive the two baffles 21 to a vertical state. At this time, the two baffles 21 are in the same plane and form a complete circular plate, that is, the valve plate 20. At this time, the circumferential side walls of the two baffles 21 are in contact with the inner wall of the housing 10, thereby blocking the two end openings of the housing 10, so that the valve plate 20 is in a closed state.

[0034] Reference Figure 1 and Figure 2 In order to enable the two baffles 21 to move synchronously to realize the opening and closing of the valve plate 20, a transmission assembly 50 is set on the rotating rod 31 and connected to the transmission rod 32. The transmission assembly 50 includes a rotating gear 51 and a transmission gear 52. The rotating gear 51 is coaxially sleeved on the rotating rod 31, and the rotating gear 51 is fixed to the rotating rod 31, while the transmission gear 52 is coaxially fixed on the transmission rod 32, and the transmission gear 52 is meshed with the rotating gear 51.

[0035] When in use, the wind enters from the opening at one end of the housing 10, which is a positive airflow. When the gas flows to the baffle 21, the baffle 21 is pushed and flipped, that is, the rotating rod 31 or the transmission rod 32 rotates. Because the rotating gear 51 and the transmission gear 52 are meshed and transmitted, the rotating rod 31 and the transmission rod 32 rotate synchronously, thereby driving the two baffles 21 to move away from each other by the same distance at the same time, ensuring that the two baffles 21 are simultaneously pressed against the inner wall of the housing 10, realizing the immediate closure of the valve plate 20, and preventing the airflow from flowing back. Similarly, the two baffles 21 will also approach each other at the same time, which is convenient for opening the valve plate 20.

[0036] Reference Figure 1 and Figure 2 One end of the rotating rod 31 extends out of the shell 10 and is fixed with a connecting rod 40, the connecting rod 40 is perpendicular to the rotating rod 31, and the connection between the rotating rod 31 and the connecting rod 40 is not at the center of the connecting rod 40, and a counterweight block 41 is fixed on one end of the connecting rod 40 close to the rotating rod 31.

[0037] In the initial state, one end of the connecting rod 40 with the counterweight 41 hanging thereon tilts downward under the action of the counterweight 41, and at this time, the circumferential side wall of the valve plate 20 abuts against the inner wall of the housing 10, thereby blocking the housing 10, so that the two ends of the housing 10 are not connected. When in use, when the positive airflow enters the housing 10, a thrust is applied to the baffle 21, wherein the connecting rod 40 uses the connection between the connecting rod 40 and the rotating shaft 30 as a fulcrum to form a lever mechanism, and the baffle 21 needs to be rotated to open, that is, the airflow force needs to overcome the gravity of the counterweight 41 and the action of the lever mechanism to push the valve plate 20 to open.

[0038] Reference Figure 1 and Figure 2 When there is no airflow or gas enters from the other end of the housing 10, it is a reverse airflow. The counterweight 41 quickly drives one end of the connecting rod 40 to tilt downward under the action of gravity. At this time, the valve plate 20 is in a closed state. The gravity of the counterweight 41 acts as an auxiliary force, making it difficult for the end of the connecting rod 40 connected to the counterweight 41 to lift up, making it difficult for the connecting rod 40 to rotate, thereby increasing the tightness of the valve plate 20 blocking the housing 10 and preventing backflow of airflow. The gravity of the counterweight 41 provides a continuous closing force for the valve plate 20, enhancing the stability of the air valve under conditions of no airflow or weak airflow.

[0039] One end of the connecting rod 40 connected to the counterweight 41 is close to the fulcrum of the lever mechanism, so that the section of the connecting rod 40 connected to the counterweight 41 as a power arm is shorter and requires more power, making it inconvenient to lift this section of the connecting rod 40, thereby amplifying the resistance to the rotation of the connecting rod 40, prompting the valve plate 20 to fit closely to the inner wall of the shell 10, thereby achieving the stability of the valve body's closure and further preventing air flow backflow.

[0040] Reference Figure 2 and Figure 3 A limit assembly 60 is provided on the other side of the housing 10, which can assist the lever mechanism. The limit assembly 60 includes a moving frame 61, a rotating block 62 and a transmission block 63. The moving frame 61 is slidably connected to the housing 10 through a slide rail. Specifically, the moving frame 61 can move along the length direction of the housing 10. One end of the rotating rod 31 and the transmission rod 32 are both inserted into the housing 10 and inserted into the moving frame 61, and can move relatively in the moving frame 61.

[0041] Reference Figure 2 and Figure 3 The rotating block 62 is fixed to the side wall of the rotating rod 31 , and a rotating hole 611 is opened on the inner wall of one side of the moving frame 61 . The rotating block 62 is inserted into the rotating hole 611 and is loosely matched with the rotating hole 611 , so that the rotating block 62 can rotate in the rotating hole 611 .

[0042] Reference Figure 2 and Figure 3The transmission block 63 is fixed to the side wall of the transmission rod 32, that is, the rotating block 62 and the transmission block 63 are arranged symmetrically with the central axis of the length direction of the moving frame 61. A transmission hole 612 is opened on the inner wall of the other side of the moving frame 61, and the transmission block 63 is inserted into the transmission hole 612 and can rotate in the transmission hole 612.

[0043] When the baffle 21 flips, the rotating rod 31 and the transmission rod 32 both rotate, so that the rotating block 62 is displaced around the circumferential trajectory of the rotating rod 31, and the transmission block 63 is displaced around the circumferential trajectory of the transmission rod 32. In this process, the rotating block 62 abuts against the inner wall of the rotating hole 611, thereby applying a resisting thrust to the inner wall of the mounting hole, and the transmission block 63 applies a resisting thrust to the inner wall of the transmission hole 612. Since the rotating directions of the rotating rod 31 and the transmission rod 32 are opposite, that is, the displacement directions of the rotating block 62 and the transmission block 63 are opposite, but the rotating block 62 and the transmission block 63 are located on both sides of the moving frame 61, so that the moving block is subjected to the same thrust, so that the sliding of the moving frame 61 on the housing 10 is realized. Reference Figure 2 and Figure 3 , and the moving tracks of the rotating block 62 and the transmission block 63 are arc-shaped, and are limited by the rotating hole 611 and the transmission hole 612, so that the moving distance of the rotating block 62 and the transmission block 63 is limited, thereby limiting the rotation angle of the rotating rod 31 and the transmission rod 32, so that when the two baffles 21 approach each other, they will not directly collide with each other, thereby increasing the stability of the valve plate 20 structure. The limitation of the rotation angle of the rotating rod 31 also prevents the connecting rod 40 from rotating to a vertical state, so that the counterweight block 41 will not be vertically downward, ensuring that the baffle 21 can always be affected by the lever mechanism.

[0044] Reference Figure 2 and Figure 3 One end of the moving frame 61 is connected to a weighted ball 6131 through a connecting rope 613. A support plate 11 is fixed on the housing 10. The weighted ball 6131 can be placed on the support plate 11. A limiting plate 110 is fixed on the side of the support plate 11 away from the housing 10, so that when the weighted ball 6131 is placed on the support plate 11, it is not easy to slide off the side of the support plate 11. The moving frame 61 can move on the support plate 11, and the weighted ball 6131 is pushed down the support plate 11. The weighted ball 6131 drives the connecting rope 613 to drive the moving frame 61 to move quickly, increase the rotation speed of the rotating rod 31 and the transmission rod 32, so that the two baffles 21 are close to each other, and the lever mechanism is assisted to enable the valve plate 20 to close quickly and tightly when facing reverse airflow, effectively preventing airflow backflow.

[0045] Reference Figure 2 and Figure 4The housing 10 is provided with a moving assembly 70 for driving the weighted ball 6131 to be placed on the support plate 11. The moving assembly 70 includes a cylinder 71, a moving plate 72 and a photoelectric sensor 75. The cylinder 71 is mounted on the housing 10 by bolts. The output end of the cylinder 71 is vertically upward and fixed with a fixing plate 80. The fixing plate 80 is arranged horizontally. A connecting spring 90 is arranged along the four sides of the fixing plate 80 on the fixing plate 80. The moving plate 72 is fixed to the top of the connecting spring 90. A receiving hole 721 is opened through the middle of the moving plate 72. A plurality of mounting rods are fixed on the inner wall of the receiving hole 721. The plurality of mounting rods are evenly arranged along the circumference of the receiving hole 721. A torsion spring 73 is sleeved on the mounting rod. One end of the torsion spring 73 is fixed to the inner wall of the receiving hole 721, and the other end is fixed with a receiving bar 74. The torsion spring 73 is used to drive the receiving bar 74 to tilt upward.

[0046] Reference Figure 2 and Figure 4 When the weighted ball 6131 slides off the support plate 11, the weighted ball 6131 can be aligned and inserted into the accommodating hole 721. During this process, the weighted ball 6131 abuts against the receiving bar 74 and applies downward pressure to it, causing the torsion spring 73 to deform and drive the receiving bar 74 to rotate downward. A plurality of abutment blocks 722 are fixed on the bottom wall of the movable plate 72, and the plurality of abutment blocks 722 correspond to the receiving bar 74 one by one. The receiving bar 74 will eventually turn to abut against the abutment blocks 722, that is, the receiving bar 74 is in a tilted downward state, thereby supporting the weighted ball 6131 on the movable plate 72.

[0047] Reference Figure 2 and Figure 4 The photoelectric sensor 75 is arranged on the bottom wall of the movable plate 72. The photoelectric sensor 75 is connected to the cylinder 71 by signal. The transmitting end 751 and the receiving end 752 of the photoelectric sensor 75 are both installed on the bottom wall of the movable plate 72, and the transmitting end 751 and the receiving end 752 are arranged symmetrically with the central axis of the accommodating hole 721 as the axis.

[0048] When the valve plate 20 is closed, the moving frame 61 moves on the support plate 11, pushing the weighted ball 6131 off the support plate 11 until the weighted ball 6131 falls on the moving plate 72. The side of the moving plate 72 away from the housing 10 is also fixed with a limit plate 110 to limit the weighted ball 6131 from rolling off the moving plate 72. When the weighted ball 6131 falls onto the moving plate 72, the moving plate 72 is forced to move downward, causing the connecting spring 90 to compress and deform, thereby offsetting the impact of the weighted ball 6131, playing a role of shock absorption and buffering.

[0049] Reference Figure 2 and Figure 4, the weighted ball 6131 is aligned with the receiving hole 721 on the moving plate 72 and inserted into the receiving hole 721, and the weighted ball 6131 presses the receiving bar 74 to rotate downward with the torsion spring 73 as the axis, until the end of the receiving bar 74 away from the torsion spring 73 passes through the receiving hole 721 and tilts downward, and the valve plate 20 is closed. At this time, the receiving bar 74 is inserted between the transmitting end 751 and the receiving end 752 of the photoelectric sensor 75, so that the light emitted by the transmitting end 751 is blocked by the receiving bar 74, so that the receiving end 752 cannot receive the light, and then the photoelectric sensor 75 emits a signal, driving the cylinder 71 to start, so that the moving plate 72 moves up to the support plate 11 with the weighted ball 6131, and the weighted ball 6131 is transported from the moving plate 72 to the support plate 11, and the connecting rope 613 is accumulated.

[0050] At this time, the receiving bar 74 loses its squeezing force, and the torsion spring 73 recovers its deformation, so that the receiving bar 74 tilts upward again, so that there is no obstruction between the transmitting end 751 and the receiving end 752 of the photoelectric sensor 75, that is, the receiving end 752 can receive the light emitted by the transmitting end 751, and drive the cylinder 71 to drive the moving plate 72 to move downward, so as to reset the moving plate 72 and the weighted ball 6131. ​​When the valve plate 20 needs to be opened next time, the moving frame 61 moves away from the support plate 11, so that the accumulated connecting rope 613 is continuously stretched without pulling the weighted ball 6131 to move, so that the weighted ball 6131 will not cause resistance interference to the opening of the valve plate 20, and it is convenient for the subsequent rotation of the two baffles 21.

[0051] Reference Figure 2 and Figure 4 The limit block 111 is fixed on the end wall of the support plate 11, and when the cylinder 71 drives the fixed plate 80 to move upward, thereby driving the moving plate 72 and the weighted ball 6131 to move to the support plate 11, the top wall of the moving plate 72 abuts against the limit block 111, and the limit block 111 plays a limiting role, so that the side of the moving plate 72 close to the support plate 11 cannot move upward, while the fixed plate 80 is still moving upward, so that the fixed plate 80 squeezes the part of the connecting spring 90 close to the support plate 11, and the remaining part of the moving plate 72 moves upward under the push of the fixed plate 80, so that the moving plate 72 finally tilts in the direction of the support plate 11. Specifically, the end of the moving plate 72 close to the support plate 11 is lower than the end of the moving plate 72 away from the support plate 11. At this time, the top wall of the moving plate 72 forms a guide surface, so that the weighted ball 6131 can roll down the moving plate 72 to the support plate 11 without manual handling. When the weighted ball 6131 is separated from the moving plate 72, the photoelectric sensor 75 drives the cylinder 71 to reset, so that the moving plate 72 is re-positioned under the support plate 11 to receive the weighted ball 6131 that falls subsequently.

[0052] The implementation principle of the anti-backflow check valve of the embodiment of the present application is as follows: in the initial state, one end of the connecting rod 40 with the counterweight 41 hanging thereon tilts downward under the action of the counterweight 41, and at this time, the circumferential side wall of the valve plate 20 abuts against the inner wall of the shell 10, thereby blocking the shell 10, so that the two ends of the shell 10 are not connected. When in use, when the positive airflow enters the shell 10, a thrust is applied to the baffle 21, wherein the connecting rod 40 uses the connection point of the connecting rod 40 and the rotating shaft 30 as a fulcrum to form a lever mechanism, and the baffle 21 needs to be rotated to open, that is, the airflow force needs to overcome the gravity of the counterweight 41 and the action force of the lever mechanism to push the valve plate 20 to open.

[0053] When there is no airflow or gas enters from the other end of the shell 10, it is a reverse airflow. The counterweight block 41 quickly drives one end of the connecting rod 40 to tilt downward under the action of gravity. At this time, the valve plate 20 is in a closed state. The gravity of the counterweight block 41 and the amplifying effect of the lever mechanism jointly prompt the valve plate 20 to close tightly, thereby enhancing the stability of the air valve under conditions of no airflow or weak airflow.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A backflow prevention check air valve, characterized in that: include: A shell (10), wherein both ends of the shell (10) are open; A valve plate (20) is rotatably connected to the housing (10) via a rotating shaft (30), and the valve plate (20) is capable of sealing the housing (10); A connecting rod (40), wherein the connecting rod (40) is connected to the rotating shaft (30), the connecting rod (40) is perpendicular to the rotating shaft (30), a counterweight (41) is fixed to one end of the connecting rod (40) close to the rotating shaft (30), when one end of the connecting rod (40) connected to the counterweight (41) is lower than the other end of the connecting rod (40), the valve plate (20) abuts against the inner wall of the shell (10) to seal the shell (10), and when one end of the connecting rod (40) connected to the counterweight (41) is higher than the other end, the valve plate (20) is separated from the inner wall to open the shell (10).

2. The anti-backflow check air valve according to claim 1, characterized in that: The valve plate (20) comprises two baffles (21) arranged opposite to each other. When the two baffles (21) are in the same plane, they are used to block the housing (10). The rotating shaft (30) comprises a rotating rod (31) and a transmission rod (32). Both the rotating rod (31) and the transmission rod (32) are arranged along the width direction of the housing (10). One of the baffles (21) is fixed to the rotating rod (31), and the other baffle (21) is fixed to the transmission rod (32). The rotating rod (31) and the transmission rod (32) are connected via a transmission assembly (50). The transmission assembly (50) is used to control the rotating rod (31) and the transmission rod (32) to rotate synchronously, so as to drive the two baffles (21) to move closer to or farther from each other. One end of the rotating rod (31) extends out of the housing (10) and is fixed to the connecting rod (40).

3. The anti-backflow check air valve according to claim 2, characterized in that: The transmission assembly (50) comprises: A rotating gear (51) is coaxially sleeved on the rotating rod (31) and fixed to the rotating rod (31); The transmission gear (52) is coaxially sleeved on the transmission rod (32) and fixed to the transmission rod (32). The transmission gear (52) is meshed with the rotating gear (51).

4. The anti-backflow check air valve according to claim 2, characterized in that: The housing (10) is provided with a limit assembly (60) for limiting the rotation angle of the rotation rod (31) and the transmission rod (32), and the limit assembly (60) comprises: A moving frame (61) is slidably connected to the housing (10), one end of the rotating rod (31) and the transmission rod (32) are both passed through the housing (10) and inserted into the moving frame (61), and can move relatively in the moving frame (61); A rotating block (62), the rotating block (62) being fixed to a side wall of the rotating rod (31), a rotating hole (611) being provided on an inner wall of one side of the moving frame (61), the rotating block (62) being inserted into the rotating hole (611) and being able to rotate in the rotating hole (611); A transmission block (63) is fixed to the side wall of the transmission rod (32); a transmission hole (612) is provided on the inner wall of the other side of the moving frame (61); the transmission block (63) is inserted into the transmission hole (612) and can rotate in the transmission hole (612).

5. The anti-backflow check air valve according to claim 4, characterized in that: One end of the movable frame (61) is connected to a weighted ball (6131) via a connecting rope (613); a support plate (11) is fixed on the shell (10); the weighted ball (6131) can be placed on the support plate (11); the movable frame (61) can move on the support plate (11); when the movable frame (61) moves in the direction of the weighted ball (6131), it is used to drive a baffle (21) to block the shell (10); and a movable component (70) is provided on the shell (10) for driving the weighted ball (6131) to be placed on the support plate (11).

6. The anti-backflow check air valve according to claim 5, characterized in that: The moving assembly (70) comprises: A cylinder (71) is arranged on the housing (10); The movable plate (72) is arranged on the output end of the cylinder (71). The cylinder (71) is used to drive the movable plate (72) to move in a direction close to or away from the support plate (11). The movable plate (72) is provided with a receiving hole (721) through it. A plurality of receiving bars (74) are hinged on the inner wall of the receiving hole (721) through a torsion spring (73). The torsion spring (73) is used to drive the receiving bar (74) to tilt upward. The weighted ball (6131) can be inserted into the receiving hole (721) and drive the receiving bar (74) to tilt downward. A photoelectric sensor (75) is arranged on the movable plate (72). The photoelectric sensor (75) is connected to the cylinder (71) by signal. The transmitting end (751) and the receiving end (752) of the photoelectric sensor (75) are arranged symmetrically with the central axis of the receiving hole (721). When the receiving bar (74) is inserted between the transmitting end (751) and the receiving end (752), the photoelectric sensor (75) is used to control the start of the cylinder (71).

7. The anti-backflow check air valve according to claim 6, characterized in that: A plurality of abutment blocks (722) are fixed on the bottom wall of the movable plate (72), and the plurality of abutment blocks (722) correspond to the receiving bars (74) one by one, and the receiving bars (74) can abut against the abutment blocks (722).

8. The anti-backflow check air valve according to claim 6, characterized in that: A fixed plate (80) is fixed on the output end of the cylinder (71), and the movable plate (72) is connected to the fixed plate (80) via a connecting spring (90).

9. The anti-backflow check air valve according to claim 8, characterized in that: A limit block (111) is provided on the support plate (11); when the movable plate (72) moves upward, a side of the top wall of the movable plate (72) close to the support plate can abut against the limit block (111), so as to drive the side of the movable plate (72) close to the support plate (11) to tilt downward.

10. The anti-backflow check air valve according to claim 6, characterized in that: A limiting plate (110) is fixed to the side of the movable plate (72) and the support plate (11) away from the housing (10).

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