Flue check valve with high efficiency of smoke exhaust

Abstract

The present application belongs to the technical field of pipeline, and particularly relates to a flue check valve with high smoke exhaust efficiency, which comprises a control system, a connecting mechanism, a valve body, a valve clack and a rotating shaft. The valve clack comprises a first valve clack, a second valve clack and a third valve clack. The first valve clack comprises a connecting plate and hinged plates hinged on both sides of the connecting plate through torsional springs. The connecting mechanism comprises a first connecting strip and a second connecting strip. The two ends of the first connecting strip are hinged with the connecting plate and the second valve clack respectively, and the two ends of the second connecting strip are hinged with the second valve clack and the third valve clack respectively. The control system comprises a controller and a first electromagnet, and the first electromagnet is electrically connected with the controller. The first electromagnet is arranged on the upper surface of a mounting ring, the first valve clack is a metal valve clack, the first electromagnet can adsorb the first valve clack, and the connecting plate of the first valve clack is arranged perpendicularly to the mounting ring. The connecting plate of the first valve clack, the second valve clack and the third valve clack are parallel. The present scheme has higher oil fume exhaust efficiency.

Description

Technical Field

[0001] This invention belongs to the field of pipeline technology, specifically relating to a high-efficiency flue gas check valve. Background Technology

[0002] Modern high-rise buildings typically use shared flues to exhaust cooking fumes. To prevent fumes from other floors from flowing back into the range hoods on this floor, shared flues often employ double-layered flues and backflow preventer connections. A shared vertical exhaust system is a common ventilation method in residential kitchens. Cooking fumes are exhausted through the range hood and backflow preventer into the shared flue.

[0003] A flue gas check valve is a type of valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow. Currently, most flue gas check valves are configured with several valve discs distributed vertically or horizontally; a few are single-disc valves, but these generally cannot be fully opened within the valve body. Specifically, for example... Figure 7 The flue check valve 1' shown is composed of several valve discs. When exhausting smoke, the first valve disc 11', the second valve disc 12', and the third valve disc 13' can only open to a certain angle due to their own weight. At the same time, the first valve disc 11' can only open to a certain angle due to the obstruction of the inner peripheral wall of the flue check valve 1'. This is not conducive to the exhaust of oil fumes, affects the exhaust efficiency, leads to indoor pollution, and in severe cases, endangers people's physical and mental health. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a high-efficiency flue check valve for smoke extraction. This solves the problem that in existing flue check valves, the multiple valve discs cannot be fully opened within the valve body, but can only open to a certain angle, which is not conducive to the discharge of oil fumes, affects the smoke extraction efficiency, leads to indoor pollution, and in severe cases, endangers people's physical and mental health.

[0005] The technical solution adopted in this invention is as follows: a high-efficiency flue check valve for smoke exhaust, comprising a control system, a connecting mechanism, a valve body, a valve disc, and a rotating shaft;

[0006] The valve body is a cylindrical structure with openings at both ends. An installation ring is fitted on the inner circumferential wall of the valve body, and a wind-resistant seat is fitted on the outer circumferential wall of the valve body.

[0007] The valve disc includes a first valve disc, a second valve disc, and a third valve disc. One end of each of the first, second, and third valve discs is rotatably connected to the mounting ring via a rotating shaft. The end of the first valve disc away from the rotating shaft can abut against the second valve disc, the end of the second valve disc away from the rotating shaft can abut against the third valve disc, and the end of the third valve disc away from the rotating shaft can abut against the mounting ring.

[0008] The first valve disc includes a connecting plate and a hinge plate. One end of the connecting plate is rotatably connected to the mounting ring via a rotating shaft. There are two hinge plates, which are respectively hinged to both sides of the connecting plate. A torsion spring is connected between the connecting plate and the hinge plate, and the torsion spring is located on the lower surface of the connecting plate and the hinge plate.

[0009] The connecting mechanism includes a first connecting bar and a second connecting bar;

[0010] One end of the first connecting strip is hinged to the lower surface of the connecting plate of the first valve disc. The connecting plate of the first valve disc has a first clearance hole so that the other end of the first connecting strip can pass through the first valve disc upward and extend above the second valve disc. The other end of the first connecting strip is hinged to the upper surface of the second valve disc.

[0011] One end of the second connecting strip is hinged to the lower surface of the second valve disc. The second valve disc has a second clearance hole so that the other end of the second connecting strip can pass through the second valve disc upward and extend above the third valve disc. The other end of the second connecting strip is hinged to the upper surface of the third valve disc.

[0012] The control system includes a controller and a first electromagnet, wherein the first electromagnet is electrically connected to the controller.

[0013] The first electromagnet is disposed on the upper surface of the mounting ring, located near the connecting plate of the first valve disc. The first valve disc is a metal valve disc. The first electromagnet can attract the connecting plate of the first valve disc, and make the connecting plate of the first valve disc perpendicular to the mounting ring. The connecting plate of the first valve disc, the second valve disc, and the third valve disc are parallel.

[0014] Furthermore, the control system also includes a wind direction sensor, which is electrically connected to the controller;

[0015] The wind direction sensor is installed on the inner wall of the valve body. The wind direction sensor detects the wind direction of the gas in the valve body, generates a wind direction detection signal, and feeds back the wind direction detection signal to the controller.

[0016] The controller controls the opening and closing of the first electromagnet based on the wind direction detection signal.

[0017] Furthermore, the first valve disc, the second valve disc, and the third valve disc are all provided with connecting portions, and the first valve disc and the second valve disc are also provided with overlapping portions, the shapes of the connecting portions and the overlapping portions being adapted to each other;

[0018] The connecting parts of the first valve disc, the second valve disc, and the third valve disc are all rotatably connected to the mounting ring via a rotating shaft, and the overlapping parts of the first valve disc and the second valve disc can be fastened to the connecting parts of the second valve disc and the third valve disc, respectively.

[0019] The lower surface of the third valve disc at the end furthest from the rotating shaft abuts against the upper surface of the mounting ring;

[0020] The first clearance hole is formed on the overlapping portion of the first valve disc, and the second clearance hole is formed on the overlapping portion of the second valve disc.

[0021] One end of the first connecting strip is hinged to the lower surface of the connecting plate of the first valve disc, and the other end of the first connecting strip extends upward through the first clearance hole to the top of the second valve disc and is hinged to the upper surface of the second valve disc.

[0022] One end of the second connecting strip is hinged to the lower surface of the connecting plate of the second valve disc, and the other end of the second connecting strip extends upward through the second clearance hole to the top of the second valve disc and is hinged to the upper surface of the third valve disc.

[0023] Furthermore, the control system also includes a pressure sensor, a second electromagnet, and a pressure block;

[0024] The pressure sensor and the second electromagnet are both electrically connected to the controller.

[0025] The pressure sensor is disposed on the upper surface of the mounting ring, and the pressure block is disposed on the upper surface of the second valve disc. The pressure block can abut against the pressure sensor. The pressure sensor detects the pressure at the upper end of the pressure sensor, generates a pressure detection signal, and feeds back the pressure detection signal to the controller.

[0026] The second electromagnet is configured as two, and is respectively disposed in the rotating shaft of the second valve disc and the third valve disc. The overlapping part of the first valve disc and the second valve disc is a metal overlapping plate. The second electromagnet in the rotating shaft of the second valve disc can attract the overlapping part of the first valve disc, and the second electromagnet in the rotating shaft of the third valve disc can attract the overlapping part of the second valve disc.

[0027] The controller controls the opening and closing of the second electromagnet based on the pressure detection signal.

[0028] Furthermore, the wind-resistant base is provided with an array of several threaded holes.

[0029] Furthermore, the upper surface of the wind-resistant base is provided with staggered reinforcing ribs.

[0030] Furthermore, a sealing strip is provided on the lower surface of the overlapping portion.

[0031] Furthermore, both ends of the rotating shaft are rotatably connected to the mounting ring via bearings.

[0032] Furthermore, the connecting plate and the hinge plate of the first valve disc are hinged together by a hinge, which is disposed on the upper surface of the connecting plate and the hinge plate.

[0033] The beneficial effects of this invention are as follows: The valve body is installed inside the flue via a wind-resistant seat. When the fumes pass through the check valve, the impact force of the fumes opens the valve discs, allowing for smoke exhaust. When the valve body is installed in the indoor smoke exhaust channel via the wind-resistant seat, the smoke inside the valve body opens the first, second, and third valve discs as the fumes pass through the check valve. The controller then energizes the first electromagnet to open the valve. When the first valve disc rotates to a certain angle, until the first electromagnet can attract the connecting plate of the first valve disc, the connecting plate of the first valve disc is perpendicular to the mounting ring. The two sides of the connecting plate of the first valve disc... The hinge plate on the side will be blocked by the inner peripheral wall of the valve body and rotate inward, so that a certain angle is formed between the connecting plate and the hinge plate, which makes it easy for the connecting plate of the first valve disc to be perpendicular to the mounting ring. The first connecting strip drives the second valve disc to continue to rotate until the second valve disc is perpendicular to the mounting ring. The second connecting strip drives the third valve disc to continue to rotate until the third valve disc is perpendicular to the mounting ring. This makes the opening angle of the connecting plate of the first valve disc, the second valve disc and the third valve disc ninety degrees, which increases the smoke exhaust angle, which is conducive to the exhaust of oil fumes and makes the exhaust efficiency higher.

[0034] After the smoke exhaust is completed, the controller de-energizes the first electromagnet, causing the first valve disc to detach from its attraction. The first, second, and third valve discs then reset and seal due to their own gravity. When the first valve disc rotates to reset, the torsion spring between the connecting plate and the hinge plate causes the connecting plate and the hinge plate to reset without external force, ensuring that the connecting plate and the hinge plate are on the same plane, thus guaranteeing the sealing of the valve body and preventing backflow of smoke. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the present invention from a top view (valve disc closed state);

[0036] Figure 2 This is a three-dimensional structural diagram of the present invention viewed from a low angle (valve disc in open state);

[0037] Figure 3 This is a three-dimensional structural diagram of the present invention from a top view (valve disc in open state);

[0038] Figure 4 This is a first-person side view of the valve body (the valve body and wind-resistant seat are not shown in the figure);

[0039] Figure 5 This is a second perspective view of the valve body's internal side view (the valve body and wind-resistant seat are not shown in the figure);

[0040] Figure 6 This is a cross-sectional view of the rotating shaft of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of an existing flue gas check valve;

[0042] Figure 8 This is a schematic diagram of the flue system of the present invention;

[0043] The attached diagram is labeled as follows:

[0044] Existing technology:

[0045] Flue check valve 1', first valve disc 11', second valve disc 12', third valve disc 13';

[0046] This invention:

[0047] Valve body 1, mounting ring 11, windproof seat 12, threaded hole 13, reinforcing rib 14, valve disc 2, first valve disc 21, connecting plate 211, hinge plate 212, second valve disc 22, third valve disc 23, first clearance hole 24, second clearance hole 25, connecting part 26, overlapping part 27, torsion spring 28, hinge 29, rotating shaft 3, connecting mechanism 4, first connecting bar 41, second connecting bar 42, control system 5, first electromagnet 51, wind direction sensor 52, pressure sensor 53, second electromagnet 54, pressure block 55, bearing seat 6, flue system 7, range hood 71, indoor smoke exhaust channel 72, flue check valve 73, common flue 74. Detailed Implementation

[0048] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0049] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and 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 of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Example 1:

[0052] like Figures 1-6 As shown, a high-efficiency flue check valve includes a control system 5, a connecting mechanism 4, a valve body 1, a valve disc 2, and a rotating shaft 3.

[0053] The valve body 1 is a cylindrical structure with open ends. An installation ring 11 is fitted on the inner peripheral wall of the valve body 1, and a wind-resistant seat 12 is fitted on the outer peripheral wall of the valve body 1.

[0054] The valve disc 2 includes a first valve disc 21, a second valve disc 22, and a third valve disc 23. One end of each of the first valve disc 21, the second valve disc 22, and the third valve disc 23 is rotatably connected to the mounting ring 11 via a rotating shaft 3. The end of the first valve disc 21 away from the rotating shaft 3 can abut against the second valve disc 22, the end of the second valve disc 22 away from the rotating shaft 3 can abut against the third valve disc 23, and the end of the third valve disc 23 away from the rotating shaft 3 can abut against the mounting ring 11.

[0055] The first valve disc 21 includes a connecting plate 211 and a hinge plate 212. One end of the connecting plate 211 is rotatably connected to the mounting ring 11 via a rotating shaft 3. There are two hinge plates 212, which are respectively hinged to both sides of the connecting plate 211. A torsion spring 28 is connected between the connecting plate 211 and the hinge plate 212. The torsion spring 28 is located on the lower surface of the connecting plate 211 and the hinge plate 212.

[0056] The connecting mechanism 4 includes a first connecting bar 41 and a second connecting bar 42;

[0057] like Figure 1 and Figure 2 As shown, one end of the first connecting strip 41 is hinged to the lower surface of the connecting plate 211 of the first valve disc 21. The connecting plate 211 of the first valve disc 21 is provided with a first clearance hole 24 so that the other end of the first connecting strip 41 can pass through the first valve disc 21 and extend to the top of the second valve disc 22. The other end of the first connecting strip 41 is hinged to the upper surface of the second valve disc 22.

[0058] One end of the second connecting bar 42 is hinged to the lower surface of the second valve disc 22. The second valve disc 22 is provided with a second clearance hole 25 so that the other end of the second connecting bar 42 can pass through the second valve disc 22 upward and extend above the third valve disc 23. The other end of the second connecting bar 42 is hinged to the upper surface of the third valve disc 23.

[0059] The control system 5 includes a controller and a first electromagnet 51, wherein the first electromagnet 51 is electrically connected to the controller.

[0060] The first electromagnet 51 is disposed on the upper surface of the mounting ring 11, located near the connecting plate 211 of the first valve disc 21. The first valve disc 21 is a metal valve disc 2. The first electromagnet 51 can attract the connecting plate 211 of the first valve disc 21, and make the connecting plate 211 of the first valve disc 21 perpendicular to the mounting ring 11. The connecting plate 211 of the first valve disc 21, the second valve disc 22 and the third valve disc 23 are parallel.

[0061] In this embodiment, the controller is a microcontroller, preferably an STM32H series high-performance microcontroller; the first electromagnet 51 is a Sheng Hui brand, model SH-H3530.

[0062] As a preferred embodiment, the control system 5 also includes a wind direction sensor 52, which is electrically connected to the controller;

[0063] The wind direction sensor 52 is installed on the inner wall of the valve body 1. The wind direction sensor 52 detects the wind direction of the gas inside the valve body 1, generates a wind direction detection signal, and feeds back the wind direction detection signal to the controller.

[0064] The controller controls the opening and closing of the first electromagnet 51 based on the wind direction detection signal.

[0065] In this embodiment, as Figure 2 As shown, by installing a wind direction sensor 52 on the inner wall of the valve body 1, the wind direction of the gas inside the valve body 1 is detected, a wind direction detection signal is generated, and the wind direction detection signal is fed back to the controller. The wind direction sensor 52 controls the opening and closing of the first electromagnet 51 according to the wind direction detection signal; specifically, as shown... Figures 3 to 5As shown, when exhausting smoke, the upward flow of smoke in the valve body 1 pushes open the first valve disc 21, the second valve disc 22, and the third valve disc 23. The wind direction sensor 52 detects the upward flow of smoke in the valve body 1 and feeds it back to the controller. The controller then controls the first electromagnet 51 to be energized and opened. When the first valve disc 21 rotates to a certain angle, in this embodiment, the adsorption end of the first electromagnet 51 faces the first valve disc 21 until the first electromagnet 51 can adsorb the upper surface of the connecting plate 211 of the first valve disc 21, so that the connecting plate 211 of the first valve disc 21 is distributed perpendicular to the mounting ring 11. The hinge plates 212 on both sides of the connecting plate 211 of the first valve disc 21 will be blocked by the inner peripheral wall of the valve body 1 and rotate inward, so that a certain angle is formed between the connecting plate 211 and the hinge plate 212, so that the connecting plate 211 of the first valve disc 21 can be distributed perpendicular to the mounting ring 11. And through the first connecting strip 41, the second valve disc 22 is driven to continue to rotate until the second valve disc 22 is perpendicular to the mounting ring 11. The connecting strip 42 drives the third valve disc 23 to continue rotating until the third valve disc 23 is perpendicular to the mounting ring 11, so that the opening angle of the connecting plate 211 of the first valve disc 21, the second valve disc 22, and the third valve disc 23 is ninety degrees, increasing the exhaust angle and facilitating the exhaust of oil fumes, thus making the exhaust efficiency higher. After the exhaust is completed, if there is backflow of smoke, the wind direction sensor 52 detects that the airflow direction in the valve body 1 is downward and feeds back to the controller. The controller then controls the first electromagnet 51 to be de-energized and closed, and the valve disc 2... The valve body will close downwards due to its own gravity, causing the first valve 21 to detach from the first electromagnet 51. The first valve 21, the second valve 22, and the third valve 23 will all close downwards to prevent backflow of flue gas. After the flue gas exhaust is completed, the wind direction sensor 52 detects the wind direction in the valve body 1 where there is no flue gas flow and feeds it back to the controller. The controller then controls the first electromagnet 51 to be de-energized and closed, causing the first valve 21 to detach from the first electromagnet 51. The first valve 21, the second valve 22, and the third valve 23 will all close downwards.

[0066] The wind direction sensor 52 in this embodiment is a small ultrasonic wind speed and direction sensor 52, brand name Weimengshi, model VMS-3003-CFSFX-N0. The working principle of the wind direction sensor 52 is to accurately measure the high-frequency components of gusts of wind pulsation in the gas inside the valve body 1. The device uses four ultrasonic probes to cyclically send and receive ultrasonic waves in a two-dimensional plane and measures the wind speed and direction by the time difference of propagation in the air.

[0067] As a preferred option, such as Figure 4 and Figure 5 As shown, the first valve disc 21, the second valve disc 22 and the third valve disc 23 are all provided with connecting parts 26, and the first valve disc 21 and the second valve disc 22 are also provided with overlapping parts 27. The shapes of the connecting parts 26 and the overlapping parts 27 are adapted to each other.

[0068] The connecting portions 26 of the first valve disc 21, the second valve disc 22 and the third valve disc 23 are all rotatably connected to the mounting ring 11 via the rotating shaft 3. The overlapping portions 27 of the first valve disc 21 and the second valve disc 22 can be fastened to the connecting portions 26 of the second valve disc 22 and the third valve disc 23 respectively.

[0069] The lower surface of the third valve disc 23 at the end away from the rotating shaft 3 abuts against the upper surface of the mounting ring 11;

[0070] The first clearance hole 24 is formed on the overlapping portion 27 of the first valve disc 21, and the second clearance hole 25 is formed on the overlapping portion 27 of the second valve disc 22.

[0071] One end of the first connecting bar 41 is hinged to the lower surface of the connecting plate 211 of the first valve disc 21, and the other end of the first connecting bar 41 extends upward through the first clearance hole 24 to the top of the second valve disc 22 and is hinged to the upper surface of the second valve disc 22.

[0072] One end of the second connecting bar 42 is hinged to the lower surface of the connecting plate 211 of the second valve disc 22, and the other end of the second connecting bar 42 extends upward through the second clearance hole 25 to the top of the second valve disc 22 and is hinged to the upper surface of the third valve disc 23.

[0073] In this embodiment, by providing connecting portions 26 for each of the first valve disc 21, the second valve disc 22, and the third valve disc 23, it is convenient to rotatably mount the first valve disc 21, the second valve disc 22, and the third valve disc 23 onto the mounting ring 11 via the rotating shaft 3. The first valve disc 21 and the second valve disc 22 also have overlapping portions 27. The shapes of the connecting portions 26 and the overlapping portions 27 are adapted to each other, allowing the overlapping portions 27 of the first valve disc 21 and the second valve disc 22 to respectively engage with the connecting portions 26 of the second valve disc 22 and the third valve disc 23. This results in better sealing between the first valve disc 21, the second valve disc 22, and the third valve disc 23, effectively concealing the closure gap between adjacent valve discs 2. This design improves the sealing effect of valve disc 2 and prevents backflow of flue gas. In this embodiment, the structure of the part of the first connecting strip 41 that passes through the first relief hole 24 is adapted to the structure of the overlapping part 27 of the first valve disc 21. The first connecting strip 41 can fit against the inner wall of the first relief hole 24 and can slide within the first relief hole 24. The structure of the part of the second connecting strip 42 that passes through the second relief hole 25 is adapted to the structure of the overlapping part 27 of the second valve disc 22. The second connecting strip 42 can fit against the inner wall of the second relief hole 25 and can slide within the first relief hole 24, thus improving the sealing performance of the overlapping part 27 of the first valve disc 21 and the second valve disc 22.

[0074] As a preferred option, such as Figures 4 to 6As shown, the control system 5 further includes a pressure sensor 53, a second electromagnet 54, and a pressure block 55; both the pressure sensor 53 and the second electromagnet 54 are electrically connected to the controller; the pressure sensor 53 is disposed on the upper surface of the mounting ring 11, and the pressure block 55 is disposed on the upper surface of the second valve disc 22. The pressure block 55 can abut against the pressure sensor 53. The pressure sensor 53 detects the pressure at the upper end of the pressure sensor 53, generates a pressure detection signal, and feeds back the pressure detection signal to the controller; two second electromagnets 54 are provided, and are respectively disposed in the rotating shaft 3 of the second valve disc 22 and the third valve disc 23. The overlapping part 27 of the first valve disc 21 and the second valve disc 22 is a metal overlapping plate. The second electromagnet 54 in the rotating shaft 3 of the second valve disc 22 can attract the overlapping part 27 of the first valve disc 21, and the second electromagnet 54 in the rotating shaft 3 of the third valve disc 23 can attract the overlapping part 27 of the second valve disc 22; the controller controls the opening and closing of the second electromagnets 54 according to the pressure detection signal.

[0075] In this embodiment, when the exhaust is finished, valve 2 closes downwards. When the first valve 21, the second valve 22, and the third valve 23 close downwards, the pressure block 55 on the second valve 22 presses down against the pressure sensor 53. The pressure sensor 53 detects the pressure at the upper end of the pressure sensor 53, generates a pressure detection signal, and feeds the pressure detection signal back to the controller. According to the pressure detection signal, the controller controls the second electromagnet 54 in the rotating shaft 3 of the second valve 22 and the third valve 23 to be energized and opened, so that the overlapping part 27 of the first valve 21 and the second valve 22 is tightly attracted to the connecting part 26 of the second valve 22 and the third valve 23. At this time, the overlapping part 27 can fit together with the connecting part 26, and at the same time, the overlapping part 27 can block the closing gap between adjacent valve 2, further improving the sealing effect of the valve 2 and better preventing backflow of flue gas.

[0076] In this embodiment, the pressure sensor 53 is an Omron brand, model 2SMPB-02E; the second electromagnet 54 is a round tube electromagnet, brand KAS, model AO1632S-12K32.

[0077] As a preferred embodiment, the wind-resistant base 12 is provided with a plurality of threaded holes 13 arranged in an array. The threaded holes 13 facilitate the fixing of the wind-resistant base 12 to the wall with screws.

[0078] As a preferred embodiment, the upper surface of the wind-resistant seat 12 is provided with staggered reinforcing ribs 14. By providing staggered reinforcing ribs 14 on the wind-resistant seat 12, the wind-resistant seat 12 is less prone to deformation, thereby increasing the overall strength of the check valve.

[0079] As a preferred embodiment, a sealing strip is provided on the lower surface of the overlapping portion 27. Providing a sealing strip on the lower surface of the overlapping portion 27 improves the sealing effect when the check valve is closed. In this embodiment, the sealing strip is a rubber sealing strip, which reduces the noise generated by the collision of the valve disc 2 when it is closed to a certain extent.

[0080] As a preferred embodiment, both ends of the rotating shaft 3 are rotatably connected to the mounting ring 11 via bearings 6. By providing bearings 6 at both ends of the rotating shaft 3, both ends of the rotating shaft 3 can be rotatably connected to the mounting ring 11, resulting in a simple structure and easy installation.

[0081] As a preferred embodiment, the connecting plate 211 and the hinge plate 212 of the first valve disc 21 are hinged together by a hinge 29, which is disposed on the upper surface of the connecting plate 211 and the hinge plate 212. By hinged to the connecting plate 211 on both sides of the first valve disc 21 by hinges 29, the structure is simple and easy to install. When the first valve disc 21 is opened by the flue gas and rotates upward to a certain angle, the hinge plates 212 on both sides of the first valve disc 21 will be blocked by the inner peripheral wall of the valve body 1 and rotate inward, so that the connecting plate 211 and the hinge plate 212 of the first valve disc 21 form a certain angle. When the flue gas is exhausted and the first valve disc 21 rotates downward to reset, under the action of the torsion spring 28 between the connecting plate 211 and the hinge plate 212, the connecting plate 211 and the hinge plate 212 of the first valve disc 21 reset without external force, so that the connecting plate 211 and the hinge plate 212 of the first valve disc 21 are located on the same plane.

[0082] The working principle of this invention is as follows:

[0083] When using, such as Figures 1 to 8As shown, the valve body 1 is horizontally installed in the indoor smoke exhaust duct 72 via the wind-resistant seat 12. The wind-resistant seat 12 is set perpendicular to the axial direction of the indoor smoke exhaust duct 72. The first valve disc 21, the second valve disc 22, and the third valve disc 23 are distributed from top to bottom. When the fumes pass through the check valve, the fumes in the valve body 1 flow to the right, pushing open the first valve disc 21, the second valve disc 22, and the third valve disc 23. The wind direction sensor 52 detects the rightward flow of the fumes in the valve body 1 and feeds it back to the controller. The controller then controls the first electromagnet 51 to be energized and opened. When the first valve disc 21 rotates to a certain angle, until the first electromagnet 51 can attract the connecting plate 211 of the first valve disc 21, so that the connecting plate 211 of the first valve disc 21 is perpendicular to the mounting ring 11. The hinge plates 212 on both sides of the connecting plate 211 of the first valve disc 21 are blocked by the inner peripheral wall of the valve body 1 and rotate inward, so that the connecting plate 211 and the hinge plate 212 form a certain angle, which makes it easy for the connecting plate 211 of the first valve disc 21 to be distributed perpendicular to the mounting ring 11. The first connecting bar 41 drives the second valve disc 22 to continue to rotate until the second valve disc 22 is perpendicular to the mounting ring 11. The second connecting bar 42 drives the third valve disc 23 to continue to rotate until the third valve disc 23 is perpendicular to the mounting ring 11, so that the opening angle of the connecting plate 211 of the first valve disc 21, the second valve disc 22 and the third valve disc 23 is ninety degrees, which increases the smoke exhaust angle, which is conducive to the exhaust of oil fumes and makes the exhaust efficiency higher.

[0084] After the smoke exhaust is completed, if backflow of smoke occurs, the wind direction sensor 52 detects that the gas direction inside the valve body 1 is to the left and sends feedback to the controller. The controller then controls the first electromagnet 51 to be de-energized and closed. The valve disc 2 will close to the left due to its own gravity, causing the first valve disc 21 to detach from the attraction of the first electromagnet 51. The first valve disc 21, the second valve disc 22, and the third valve disc 23 will all close to the left. When the first valve disc 21 rotates to reset, under the action of the torsion spring 28 between the connecting plate 211 and the hinge plate 212, the first valve disc... The connecting plate 211 and hinge plate 212 of the first valve disc 21 are reset without external force, so that the connecting plate 211 and hinge plate 212 of the first valve disc 21 are located on the same plane, thus preventing backflow of flue gas. After the exhaust is completed, the wind direction sensor 52 detects the wind direction in the valve body 1 where there is no flue gas flow and feeds it back to the controller. The controller then controls the first electromagnet 51 to be de-energized and closed, so that the first valve disc 21 is detached from the attraction of the first electromagnet 51, and the first valve disc 21, the second valve disc 22 and the third valve disc 23 all close to the left.

[0085] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A high-efficiency flue gas check valve, characterized in that: include The control system (5), the connecting mechanism (4), the valve body (1), the valve disc (2), and the rotating shaft (3); The valve body (1) is a cylindrical structure with open ends. An installation ring (11) is fitted on the inner peripheral wall of the valve body (1), and a wind-resistant seat (12) is fitted on the outer peripheral wall of the valve body (1). The valve disc (2) includes a first valve disc (21), a second valve disc (22) and a third valve disc (23). One end of the first valve disc (21), the second valve disc (22) and the third valve disc (23) are rotatably connected to the mounting ring (11) via a rotating shaft (3). The end of the first valve disc (21) away from the rotating shaft (3) can abut against the second valve disc (22). The end of the second valve disc (22) away from the rotating shaft (3) can abut against the third valve disc (23). The end of the third valve disc (23) away from the rotating shaft (3) can abut against the mounting ring (11). The first valve disc (21) includes a connecting plate (211) and a hinge plate (212). One end of the connecting plate (211) is rotatably connected to the mounting ring (11) via a rotating shaft (3). There are two hinge plates (212), which are respectively hinged to both sides of the connecting plate (211). A torsion spring (28) is connected between the connecting plate (211) and the hinge plate (212). The torsion spring (28) is located on the lower surface of the connecting plate (211) and the hinge plate (212). The connecting mechanism (4) includes a first connecting bar (41) and a second connecting bar (42); One end of the first connecting strip (41) is hinged to the lower surface of the connecting plate (211) of the first valve disc (21). A first clearance hole (24) is provided on the connecting plate (211) of the first valve disc (21) so that the other end of the first connecting strip (41) can pass through the first valve disc (21) upward and extend to the top of the second valve disc (22). The other end of the first connecting strip (41) is hinged to the upper surface of the second valve disc (22). One end of the second connecting bar (42) is hinged to the lower surface of the second valve disc (22). The second valve disc (22) has a second clearance hole (25) so that the other end of the second connecting bar (42) can pass through the second valve disc (22) upward and extend to the top of the third valve disc (23). The other end of the second connecting bar (42) is hinged to the upper surface of the third valve disc (23). The control system (5) includes a controller and a first electromagnet (51), the first electromagnet (51) being electrically connected to the controller; The first electromagnet (51) is disposed on the upper surface of the mounting ring (11) and located near the connecting plate (211) of the first valve disc (21). The first valve disc (21) is a metal valve disc (2). The first electromagnet (51) can attract the connecting plate (211) of the first valve disc (21) and make the connecting plate (211) of the first valve disc (21) perpendicular to the mounting ring (11). The connecting plate (211) of the first valve disc (21), the second valve disc (22) and the third valve disc (23) are parallel.

2. The high-efficiency flue gas check valve according to claim 1, characterized in that: The control system (5) also includes a wind direction sensor (52), which is electrically connected to the controller; The wind direction sensor (52) is installed on the inner wall of the valve body (1). The wind direction sensor (52) detects the wind direction of the gas inside the valve body (1), generates a wind direction detection signal, and feeds back the wind direction detection signal to the controller. The controller controls the opening and closing of the first electromagnet (51) based on the wind direction detection signal.

3. The high-efficiency flue gas check valve according to claim 1, characterized in that: The first valve disc (21), the second valve disc (22) and the third valve disc (23) are all provided with connecting parts (26), and the first valve disc (21) and the second valve disc (22) are also provided with overlapping parts (27). The shapes of the connecting parts (26) and the overlapping parts (27) are compatible. The connecting parts (26) of the first valve disc (21), the second valve disc (22) and the third valve disc (23) are all rotatably connected to the mounting ring (11) via the rotating shaft (3). The overlapping parts (27) of the first valve disc (21) and the second valve disc (22) can be fastened to the connecting parts (26) of the second valve disc (22) and the third valve disc (23) respectively. The lower surface of the third valve disc (23) at the end away from the rotating shaft (3) abuts against the upper surface of the mounting ring (11); The first clearance hole (24) is opened on the overlapping part (27) of the first valve disc (21), and the second clearance hole (25) is provided on the overlapping part (27) of the second valve disc (22); One end of the first connecting strip (41) is hinged to the lower surface of the connecting plate (211) of the first valve disc (21), and the other end of the first connecting strip (41) extends upward through the first clearance hole (24) to the top of the second valve disc (22) and is hinged to the upper surface of the second valve disc (22). One end of the second connecting strip (42) is hinged to the lower surface of the connecting plate (211) of the second valve disc (22), and the other end of the second connecting strip (42) extends upward through the second clearance hole (25) to the top of the second valve disc (22) and is hinged to the upper surface of the third valve disc (23).

4. The high-efficiency flue gas check valve according to claim 3, characterized in that: The control system (5) also includes a pressure sensor (53), a second electromagnet (54), and a pressure block (55); The pressure sensor (53) and the second electromagnet (54) are both electrically connected to the controller; The pressure sensor (53) is disposed on the upper surface of the mounting ring (11), and the pressure block (55) is disposed on the upper surface of the second valve disc (22). The pressure block (55) can abut against the pressure sensor (53). The pressure sensor (53) detects the pressure at the upper end of the pressure sensor (53), generates a pressure detection signal, and feeds back the pressure detection signal to the controller. Two second electromagnets (54) are provided, and are respectively located in the shaft (3) of the second valve (22) and the third valve (23). The overlapping part (27) of the first valve (21) and the second valve (22) is a metal overlapping plate. The second electromagnet (54) in the shaft (3) of the second valve (22) can attract the overlapping part (27) of the first valve (21). The second electromagnet (54) in the shaft (3) of the third valve (23) can attract the overlapping part (27) of the second valve (22). The controller controls the opening and closing of the second electromagnet (54) based on the pressure detection signal.

5. The high-efficiency flue gas check valve according to claim 1, characterized in that: The wind-resistant seat (12) is provided with several threaded holes (13).

6. The high-efficiency flue gas check valve according to claim 1, characterized in that: The upper surface of the wind-resistant seat (12) is provided with staggered reinforcing ribs (14).

7. The high-efficiency flue gas check valve according to claim 3, characterized in that: A sealing strip is provided on the lower surface of the overlapping part (27).

8. The high-efficiency flue gas check valve according to claim 1, characterized in that: The two ends of the rotating shaft (3) are rotatably connected to the mounting ring (11) through the bearing (6).

9. A high-efficiency flue gas check valve according to claim 1, characterized in that: The connecting plate (211) and the hinge plate (212) of the first valve disc (21) are hinged together by a hinge (29), which is provided on the upper surface of the connecting plate (211) and the hinge plate (212).

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