Fire rated check valve

Abstract

The present application relates to a fireproof check valve. The fireproof check valve comprises a valve body, a first smoke exhaust flue provided on the valve body, the first smoke exhaust flue comprising an air inlet at the first end thereof; a ring-shaped plate, the ring-shaped plate comprising a second smoke exhaust flue, when the ring-shaped plate is arranged on the valve body, the first smoke exhaust flue and the second smoke exhaust flue are communicated to form a smoke exhaust flue, the second smoke exhaust flue comprising a smoke isolation port on the front surface of the ring-shaped plate and a smoke exhaust port on the back surface of the ring-shaped plate; and a smoke isolation unit, the smoke isolation unit comprising at least one smoke isolation valve plate arranged in front of the smoke isolation port, each smoke isolation valve plate is movably arranged on the ring-shaped plate and / or the valve body, each smoke isolation valve plate moves relative to the ring-shaped plate and / or the valve body to open or close a smoke isolation port.

Description

Technical Field

[0001] This invention relates to a fireproof check valve. Background Technology

[0002] Existing residential buildings consist of apartments and flues. Each apartment is equipped with a range hood, and the flue has an exhaust valve. The exhaust valve comprises a valve body and a valve plate. The valve body is mounted on the wall of the apartment, and the range hood's exhaust pipe is fitted onto the valve body. The valve body has an exhaust port, and the valve plate is hinged to the valve body to open or close the exhaust port. The fumes emitted by the range hood into the exhaust pipe enter the flue through the exhaust port. However, existing exhaust valves lack the function of preventing fumes from entering the flue through the exhaust port under high-temperature conditions. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a fireproof check valve.

[0004] To address the above problems, the present invention provides the following technical solution:

[0005] Fireproof check valves include:

[0006] A valve body, wherein a first exhaust flue is provided on the valve body, the first exhaust flue including an air inlet located at its first end;

[0007] An annular plate is provided with a second exhaust flue. When the annular plate is provided on the valve body, the first exhaust flue and the second exhaust flue are connected to form an exhaust flue. The second exhaust flue includes a smoke-proof opening located on the front side of the annular plate and a smoke-exhaust opening located on the back side of the annular plate.

[0008] A smoke-blocking unit, the smoke-blocking unit including at least one smoke-blocking valve plate located in front of the smoke-blocking port, each smoke-blocking valve plate being movably disposed on the annular plate and / or the valve body, each smoke-blocking valve plate moving relative to the annular plate and / or the valve body, so as to open or close a smoke-blocking port of the smoke-blocking unit;

[0009] The smoke exhaust unit includes at least one smoke exhaust valve plate located behind the smoke exhaust port. Each smoke exhaust valve plate is movably disposed on the annular plate and / or the valve body. Each smoke exhaust valve plate moves relative to the annular plate and / or the valve body to open or close a smoke exhaust port of the smoke exhaust unit.

[0010] The number of smoke-blocking valves included in the smoke-blocking unit is different from the number of smoke-exhausting valves included in the smoke-exhausting unit.

[0011] In this invention, the fireproof backflow preventer includes an annular plate and a smoke-blocking unit. The annular plate is provided with a second smoke exhaust duct, which includes a smoke-blocking opening. The smoke-blocking unit includes at least one smoke-blocking valve plate. When the smoke-blocking unit closes the smoke-blocking opening, the smoke generated by a fire in the room will not be able to be discharged into the smoke duct through the fireproof backflow preventer.

[0012] In this invention, the smoke-isolating unit includes at least one smoke-isolating valve plate, and the smoke-exhausting unit includes at least one smoke-exhausting valve plate. The number of smoke-isolating valve plates in the smoke-isolating unit differs from the number of smoke-exhausting valve plates in the smoke-exhausting unit. When the number of smoke-isolating valve plates in the smoke-isolating unit differs from the number of smoke-exhausting valve plates in the smoke-exhausting unit, the force exerted by the smoke-isolating valve plate impacting the front of the annular plate differs from the force exerted by the smoke-exhausting valve plate impacting the back of the annular plate. This design, by differentiating the force exerted by the smoke-isolating valve plate impacting the front of the annular plate from the force exerted by the smoke-exhausting valve plate impacting the back of the annular plate, avoids resonance between the smoke-isolating valve plate and the smoke-exhausting valve plate when they impact the annular plate, and also avoids resonance between the smoke-isolating valve plate and the smoke-isolating valve plate when they impact the annular plate.

[0013] After the smoke isolation valve plate strikes the annular plate and resonates with the smoke exhaust valve plate, the smoke exhaust valve plate can open the smoke exhaust port in an instant. When the smoke isolation valve plate strikes the annular plate and rebounds, it opens the smoke isolation port. When the smoke exhaust valve plate opens the smoke exhaust port, the smoke can continuously pass through the smoke isolation port, the smoke isolation chamber and the smoke exhaust port in sequence, which will cause the fireproof check valve to fail in smoke isolation.

[0014] Similarly, after the smoke exhaust valve plate hits the annular plate and resonates with the smoke isolation valve plate, the smoke isolation valve plate can open the smoke isolation port in an instant. When the smoke exhaust valve plate hits the annular plate and rebounds, it opens the smoke exhaust port. When the smoke isolation valve plate opens the smoke isolation port, the smoke can continuously pass through the smoke exhaust port, the smoke isolation chamber and the smoke isolation port in sequence, which will cause the fireproof backflow preventer to fail to isolate smoke.

[0015] Furthermore, the annular plate of the present invention includes a smoke-proof opening and a smoke-exhaust opening. This design avoids obstructions such as "pillars" within the annular plate, thus preventing any impact on the smoke exhaust efficiency of the smoke-proof opening and the smoke-exhaust opening.

[0016] Furthermore, the number of smoke-blocking valves in the smoke-blocking unit is greater than the number of smoke-exhausting valves in the smoke-exhausting unit, and the volume of each smoke-blocking valve is less than the volume of each smoke-exhausting valve. When the volume of each smoke-blocking valve is less than the volume of each smoke-exhausting valve, the force exerted by the smoke-blocking valve on the annular plate is less than the force exerted by the smoke-exhausting valve on the annular plate. With this design, the time it takes for the smoke-blocking valve to close the smoke-blocking opening is later than the time it takes for the smoke-exhausting valve to close the smoke-exhausting opening.

[0017] Furthermore, the number of smoke-proof valve plates included in the smoke-proof unit is ≥2. When each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and causes the smoke-proof unit to close a smoke-proof port along the exhaust direction of the exhaust duct, at least two adjacent smoke-proof valve plates are stacked.

[0018] Alternatively, the number of smoke-proof valve plates included in the smoke-proof unit is ≥2. When each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and causes the smoke-proof unit to close a smoke-proof port along the exhaust direction of the exhaust passage, at least two adjacent smoke-proof valve plates are interference-fitted.

[0019] At least two adjacent smoke-proof valve plates are stacked to reduce the manufacturing precision required for the smoke-proof valve plates. At least two adjacent valve plates are interference-fitted to increase the sealing performance of the smoke-proof opening.

[0020] Furthermore, the number of exhaust valves included in the exhaust unit is ≥2. When each exhaust valve moves relative to the annular plate and / or the valve body, and causes the exhaust unit to close one exhaust port along the reverse exhaust direction of the exhaust channel, at least two adjacent exhaust valves are stacked.

[0021] Alternatively, the number of exhaust valves included in the exhaust unit is ≥2, and when each exhaust valve moves relative to the annular plate and / or the valve body, and causes the exhaust unit to close one exhaust port in the reverse exhaust direction of the exhaust passage, at least two adjacent exhaust valves are interference-fitted.

[0022] At least two adjacent smoke exhaust valve plates are stacked to reduce the manufacturing precision required for the smoke exhaust valve plates. At least two adjacent smoke exhaust valve plates are interference-fitted to increase the sealing performance of the smoke exhaust port.

[0023] Furthermore, each smoke exhaust valve plate is hinged to the annular plate, and each smoke barrier valve plate is hinged to the annular plate. When the smoke barrier unit closes one smoke barrier port and the smoke exhaust unit closes one smoke exhaust port, the smoke barrier unit, the smoke exhaust unit, and the annular plate form a smoke barrier chamber. The smoke barrier chamber can effectively prevent oil fumes from flowing from the air inlet to the smoke exhaust port, and can also effectively prevent oil fumes from flowing from the exhaust port to the air inlet.

[0024] Furthermore, the annular plate and / or the valve body are provided with a detachable first mounting seat, and the smoke-blocking valve plate is movably mounted on the first mounting seat; the annular plate and / or the valve body are also provided with a detachable second mounting seat, and the smoke-exhaust valve plate is movably mounted on the second mounting seat. This design facilitates the replacement and cleaning of the smoke-blocking valve plate and / or the smoke-exhaust valve plate.

[0025] Furthermore, each smoke-proof valve plate is fixedly connected to the annular plate and / or the valve body via a fastening mechanism. When each smoke-proof valve plate is fixedly connected to the annular plate and / or the valve body via the fastening mechanism, the smoke-proof unit opens the smoke-proof opening; when each smoke-proof valve plate stops being fixedly connected to the annular plate and / or the valve body via the fastening mechanism, each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and the smoke-proof unit closes the smoke-proof opening. This design prevents the smoke-proof valve plate from closing the smoke-proof opening when the exhaust valve is working normally, meaning that the residential building is not experiencing a fire.

[0026] Furthermore, when each smoke-blocking valve plate is fixedly connected to the annular plate and / or the valve body via a fastening mechanism, the included angle between the smoke-blocking valve plate and the centerline of the smoke-blocking opening is <90°. With this design, when each smoke-blocking valve plate is fixedly connected to the annular plate and / or the valve body via a fastening mechanism, the smoke-blocking valve plate guides the oil fumes towards the smoke-blocking opening and increases the flow rate of the oil fumes.

[0027] Furthermore, the fastening mechanism includes brazing filler metal, and each smoke-proof valve plate is also fixedly connected to the annular plate and / or the valve body via the brazing filler metal; or, the fastening mechanism includes a limiting member and brazing filler metal, with each smoke-proof valve plate abutting against the limiting member, and the limiting member being fixedly connected to the annular plate and / or the valve body via the brazing filler metal; or, the fastening mechanism includes a first limiting member, a second limiting member, and brazing filler metal for connecting the first limiting member and the second limiting member, with each smoke-proof valve plate abutting against the first limiting member, and the second limiting member being fixedly connected to the annular plate and / or the valve body. With this design, the fastening mechanism can automatically operate in the event of a fire in the residential building.

[0028] Furthermore, the fireproof check valve also includes an air guide shroud, which is disposed on the annular plate and / or the valve body. When the air guide shroud is disposed on the annular plate and / or the valve body, the air guide shroud and the annular plate and / or the valve body form an air guide channel. The air guide channel is vertically continuous, and the upper opening of the air guide channel is greater than the lower opening of the air guide channel. According to Bernoulli's principle, the air guide shroud will create a "negative pressure" at the lower opening of its air guide channel, and this "negative pressure" will increase the suction force of the exhaust valve. Attached Figure Description

[0029] Figure 1 This is a perspective view of the fireproof check valve in a preferred embodiment of the present invention;

[0030] Figure 2 This is a front view of the fireproof check valve in a preferred embodiment of the present invention;

[0031] Figure 3 for Figure 2 Sectional view at point AA;

[0032] Figure 4 for Figure 3 A magnified view of a section at point B in the middle. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0034] See Figure 2 Figure 3 Fireproof check valves include:

[0035] Valve body 1, the valve body 1 is provided with a first exhaust flue 11, the first exhaust flue 11 includes an air inlet 111 located at its first end;

[0036] Annular plate 9, with a second exhaust flue 91 on the annular plate 9. When the annular plate 9 is located on the valve body 1, the first exhaust flue 11 and the second exhaust flue 91 are connected to form an exhaust flue. The second exhaust flue 91 includes a smoke-proof opening 912 located on the front side of the annular plate 9 and an exhaust opening 911 located on the back side of the annular plate 9.

[0037] The smoke isolation unit includes at least one smoke isolation valve plate 3 located in front of the smoke isolation port 912. Each smoke isolation valve plate 3 is movably disposed on the annular plate 9 and / or valve body 1. Each smoke isolation valve plate 3 moves relative to the annular plate 9 and / or valve body 1 to open or close a smoke isolation port 912 of the smoke isolation unit.

[0038] The smoke exhaust unit includes at least one smoke exhaust valve plate 2 located behind the smoke exhaust port 911. Each smoke exhaust valve plate 2 is movably disposed on the annular plate 9 and / or valve body 1. Each smoke exhaust valve plate 2 moves relative to the annular plate 9 and / or valve body 1 to open or close a smoke exhaust port 911.

[0039] The number of smoke-proof valve plates 3 included in the smoke-proof unit is different from the number of smoke-exhaust valve plates 2 included in the smoke-exhaust unit.

[0040] It should be noted that: "Each smoke-blocking valve plate 3 is movably disposed on the annular plate 9 and / or valve body 1" in this embodiment, the smoke-blocking valve plate 3 is actually movably disposed on the annular plate 9, while in other embodiments of the present invention, the smoke-blocking valve plate 3 is movably disposed on the valve body 1; or, the smoke-blocking valve plate 3 is movably disposed on both the annular plate 9 and the valve body 1. Similarly, "Each smoke-exhaust valve plate 2 is movably disposed on the annular plate 9 and / or valve body 1" in this embodiment, the smoke-exhaust valve plate 2 is actually movably disposed on the annular plate 9, while in other embodiments of the present invention, the smoke-exhaust valve plate 2 is movably disposed on the valve body 1; or, the smoke-exhaust valve plate 2 is movably disposed on both the annular plate 9 and the valve body 1.

[0041] See Figure 1 and Figure 2 The number of smoke-proof valve plates 3 included in the smoke-proof unit is greater than the number of smoke-exhaust valve plates 2 included in the smoke-exhaust unit, and the volume of each smoke-proof valve plate 3 is less than the volume of each smoke-exhaust valve plate 2.

[0042] In this embodiment, the number of smoke-proof valve plates 3 included in the smoke-proof unit is ≥2. When each smoke-proof valve plate 3 moves relative to the annular plate 9 and / or the valve body 1, and causes the smoke-proof unit to close a smoke-proof port 912 along the exhaust direction of the exhaust channel, at least two adjacent smoke-proof valve plates 3 are stacked.

[0043] Alternatively, the number of smoke-proof valve plates 3 included in the smoke-proof unit is ≥2. When each smoke-proof valve plate 3 moves relative to the annular plate 9 and / or the valve body 1, and causes the smoke-proof unit to close a smoke-proof port 912 along the exhaust direction of the exhaust passage, at least two adjacent smoke-proof valve plates 3 are interference-fitted.

[0044] Preferably, the number of smoke-proof valve plates 3 included in the smoke-proof unit is 2, and the number of smoke-exhaust valve plates 2 included in the smoke-exhaust unit is 1.

[0045] In other embodiments of the present invention, the number of smoke exhaust valves included in the smoke exhaust unit is ≥2. When each smoke exhaust valve moves relative to the annular plate and / or the valve body, and causes the smoke exhaust unit to close a smoke exhaust port in the reverse exhaust direction of the exhaust channel, at least two adjacent smoke exhaust valves are stacked; or, the number of smoke exhaust valves included in the smoke exhaust unit is ≥2. When each smoke exhaust valve moves relative to the annular plate and / or the valve body, and causes the smoke exhaust unit to close a smoke exhaust port in the reverse exhaust direction of the exhaust channel, at least two adjacent smoke exhaust valves are interference-fitted.

[0046] See Figure 3 Each smoke exhaust valve plate 2 is hinged to the annular plate 9, and each smoke isolation valve plate 3 is hinged to the annular plate 9. When the smoke isolation unit closes a smoke isolation port 912 and the smoke exhaust unit closes a smoke exhaust port 911, the smoke isolation unit, the smoke exhaust unit and the annular plate 9 form a smoke isolation cavity.

[0047] In other embodiments of the present invention, the smoke exhaust valve plate is hinged to one end of the first connecting rod, and the annular plate is hinged to the other end of the first connecting rod. Similarly, the smoke isolation valve plate is hinged to one end of the second connecting rod, and the annular plate is hinged to the other end of the second connecting rod.

[0048] See Figure 1 and Figure 2 The annular plate 9 and / or valve body 1 are provided with a detachable first mounting seat 7, and the smoke isolation valve plate 3 is movably mounted on the first mounting seat 7; the annular plate 9 and / or valve body 1 are also provided with a detachable second mounting seat 6, and the smoke exhaust valve plate 2 is movably mounted on the second mounting seat 6.

[0049] Preferably, the second mounting base 6 is provided with a second bottom support plate 61. The smoke exhaust valve plate 2 is hinged to the second mounting base 6 via a second rotating shaft 4. The lower end face of the second rotating shaft 4 abuts against the second bottom support plate 61 under its own weight. The second rotating shaft 4 includes a second tapered section, and the lower end face of the second rotating shaft 4 is located at the position where the diameter of the second tapered section is smallest. This design reduces the rotational resistance of the second rotating shaft 4. Similarly, the first mounting base 7 is provided with a first bottom support plate. The smoke isolation valve plate 3 is hinged to the first mounting base 7 via a first rotating shaft 5. The lower end face of the first rotating shaft 5 abuts against the first bottom support plate under its own weight. The first rotating shaft 5 includes a first tapered section, and the lower end face of the first rotating shaft 5 is located at the position where the diameter of the first tapered section is smallest.

[0050] Furthermore, when each smoke-proof valve plate is fixedly connected to the annular plate and / or the valve body by a fastening mechanism, the included angle between the smoke-proof valve plate and the center line of the smoke-proof opening is <90°.

[0051] In this embodiment, each smoke-blocking valve plate 3 is also fixedly connected to the annular plate 9 and / or valve body 1 through a fastening mechanism. When each smoke-blocking valve plate 3 is fixedly connected to the annular plate 9 and / or valve body 1 through the fastening mechanism, the smoke-blocking unit opens the smoke-blocking port 912. When each smoke-blocking valve plate 3 stops being fixedly connected to the annular plate 9 and / or valve body 1 through the fastening mechanism, each smoke-blocking valve plate 3 moves relative to the annular plate 9 and / or valve body 1, and the smoke-blocking unit closes the smoke-blocking port 912.

[0052] Preferred embodiments of the fastening mechanism include: the fastening mechanism includes brazing filler metal, and each smoke-proof valve plate is also fixedly connected to the annular plate and / or valve body by brazing filler metal; or, the fastening mechanism includes a limiting member and brazing filler metal, each smoke-proof valve plate abuts against the limiting member, and the limiting member is fixedly connected to the annular plate and / or valve body by brazing filler metal; or, the fastening mechanism includes a first limiting member, a second limiting member, and brazing filler metal for connecting the first limiting member and the second limiting member, each smoke-proof valve plate abuts against the first limiting member, and the second limiting member is fixedly connected to the annular plate and / or valve body.

[0053] In this embodiment, the fireproof check valve also includes an air guide hood, which is disposed on the annular plate and / or the valve body. When the air guide hood is disposed on the annular plate and / or the valve body, the air guide hood and the annular plate and / or the valve body form an air guide channel. The air guide channel is vertically continuous, and the upper opening of the air guide channel is greater than the lower opening of the air guide channel.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A fireproof check valve, characterized in that... include: A valve body, wherein a first exhaust flue is provided on the valve body, the first exhaust flue including an air inlet located at its first end; An annular plate is provided with a second exhaust flue. When the annular plate is provided on the valve body, the first exhaust flue and the second exhaust flue are connected to form an exhaust flue. The second exhaust flue includes a smoke-proof opening located on the front side of the annular plate and a smoke-exhaust opening located on the back side of the annular plate. A smoke-blocking unit, the smoke-blocking unit including at least one smoke-blocking valve plate located in front of the smoke-blocking port, each smoke-blocking valve plate being movably disposed on the annular plate and / or the valve body, each smoke-blocking valve plate moving relative to the annular plate and / or the valve body, so as to open or close a smoke-blocking port of the smoke-blocking unit; The smoke exhaust unit includes at least one smoke exhaust valve plate located behind the smoke exhaust port. Each smoke exhaust valve plate is movably disposed on the annular plate and / or the valve body. The movement trajectory of the smoke isolation valve plate is different from that of the smoke exhaust valve plate. Each smoke exhaust valve plate moves relative to the annular plate and / or the valve body to open or close a smoke exhaust port of the smoke exhaust unit. Each smoke exhaust valve plate is hinged to the annular plate, and each smoke isolation valve plate is hinged to the annular plate. When the smoke isolation unit closes one smoke isolation port and the smoke exhaust unit closes one smoke exhaust port, the smoke isolation unit, the smoke exhaust unit, and the annular plate form a smoke isolation cavity. The number of smoke-blocking valves included in the smoke-blocking unit is different from the number of smoke-exhausting valves included in the smoke-exhausting unit; when the number of smoke-blocking valves included in the smoke-blocking unit is different from the number of smoke-exhausting valves included in the smoke-exhausting unit, the force of the smoke-blocking valve impacting the front of the annular plate is different from the force of the smoke-exhausting valve impacting the back of the annular plate.

2. The fireproof check valve as described in claim 1, characterized in that, The number of smoke-proof valves included in the smoke-proof unit is greater than the number of smoke-exhaust valves included in the smoke-exhaust unit, and the volume of each smoke-proof valve is less than the volume of each smoke-exhaust valve.

3. The fireproof check valve as described in claim 2, characterized in that, The number of smoke-proof valve plates included in the smoke-proof unit is ≥2. When each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and causes the smoke-proof unit to close a smoke-proof port along the exhaust direction of the exhaust channel, at least two adjacent smoke-proof valve plates are stacked. Alternatively, the number of smoke-proof valve plates included in the smoke-proof unit is ≥2. When each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and causes the smoke-proof unit to close a smoke-proof port along the exhaust direction of the exhaust passage, at least two adjacent smoke-proof valve plates are interference-fitted.

4. The fireproof check valve as described in claim 1, characterized in that, The number of exhaust valves included in the exhaust unit is ≥2. When each exhaust valve moves relative to the annular plate and / or the valve body, and causes the exhaust unit to close one exhaust port in the reverse exhaust direction of the exhaust channel, at least two adjacent exhaust valves are stacked. Alternatively, the number of exhaust valves included in the exhaust unit is ≥2, and when each exhaust valve moves relative to the annular plate and / or the valve body, and causes the exhaust unit to close one exhaust port in the reverse exhaust direction of the exhaust passage, at least two adjacent exhaust valves are interference-fitted.

5. The fireproof check valve as described in claim 1, characterized in that, The annular plate and / or the valve body are provided with a detachable first mounting seat, and the smoke-proof valve plate is movably mounted on the first mounting seat; the annular plate and / or the valve body are also provided with a detachable second mounting seat, and the smoke-exhaust valve plate is movably mounted on the second mounting seat.

6. The fireproof check valve as described in claim 1, characterized in that, Each smoke-proof valve plate is also fixedly connected to the annular plate and / or the valve body through a fastening mechanism. When each smoke-proof valve plate is fixedly connected to the annular plate and / or the valve body through the fastening mechanism, the smoke-proof unit opens the smoke-proof port. When each smoke-proof valve plate stops being fixedly connected to the annular plate and / or the valve body through the fastening mechanism, each smoke-proof valve plate moves relative to the annular plate and / or the valve body, and the smoke-proof unit closes the smoke-proof port.

7. The fireproof check valve as described in claim 6, characterized in that, When each smoke-proof valve plate is fixedly connected to the annular plate and / or the valve body by a fastening mechanism, the included angle between the smoke-proof valve plate and the center line of the smoke-proof opening is <90°.

8. The fireproof check valve as described in claim 6, characterized in that, The fastening mechanism includes brazing filler metal, and each smoke-proof valve plate is also fixedly connected to the annular plate and / or the valve body via the brazing filler metal; or, the fastening mechanism includes a limiting member and brazing filler metal, each smoke-proof valve plate abuts against the limiting member, and the limiting member is fixedly connected to the annular plate and / or the valve body via the brazing filler metal; or, the fastening mechanism includes a first limiting member, a second limiting member, and brazing filler metal for connecting the first limiting member and the second limiting member, each smoke-proof valve plate abuts against the first limiting member, and the second limiting member is fixedly connected to the annular plate and / or the valve body.

9. The fireproof check valve as described in claim 1, characterized in that, The fireproof check valve also includes an air guide hood, which is disposed on the annular plate and / or the valve body. When the air guide hood is disposed on the annular plate and / or the valve body, the air guide hood and the annular plate and / or the valve body form an air guide channel. The air guide channel is vertically continuous, and the upper opening of the air guide channel is greater than the lower opening of the air guide channel.

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