Fire rated check valve

Abstract

The present application relates to a fireproof check valve, which solves the problem of easy loss of locking mechanism. The fireproof check valve comprises a valve body, a first elastic element, a lever unit and a valve plate unit, the valve body is provided with an exhaust port, the valve plate unit and the lever unit are movably arranged on the valve body, the lever unit and the valve body are further connected through the first elastic element, the lever unit has a locking position and an unlocking position, and the first elastic element is used to drive the lever unit to move from the locking position to the unlocking position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port.

Description

Technical Field

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

[0002] Existing fireproof check valves include a valve body, a valve plate, a connecting rod, and a first torsion spring. The valve body has an exhaust port. The valve plate is rotatably connected to the upper end of the connecting rod, and the lower end of the connecting rod is rotatably connected to the main body. The first torsion spring is located on the main body and drives the valve plate to close the exhaust port via the connecting rod. Fireproof check valves are used to connect or disconnect the gas flow channel between indoors and outdoors. To ensure the blockage of gas flow between indoors and outdoors in the event of a fire, the fireproof check valve also includes a lever, a second torsion spring, a locking mechanism, brazing filler metal, and a mounting plate. The mounting plate is fixedly connected to the main body, and the locking mechanism is fixedly connected to the mounting plate via brazing filler metal. The lever is rotatably connected to the main body. When the locking mechanism is fixedly connected to the mounting plate via brazing filler metal, the lever abuts against the locking mechanism. When the brazing filler metal melts and the locking mechanism separates from the mounting plate, the second torsion spring pushes the connecting rod to rotate relative to the main body via the lever, thereby causing the connecting rod to push the valve plate to close the exhaust port.

[0003] However, since the locking mechanism is not directly connected to the valve body, when the brazing filler melts or is separated from the locking mechanism by external force, the locking mechanism will not be able to continue to be fixed to the valve body, which makes the locking mechanism easy to lose after it is separated from the brazing filler. Summary of the Invention

[0004] The problem to be solved by this invention is to provide a fireproof check valve that solves the problem of easy loss of the locking mechanism.

[0005] To address the above problems, the present invention provides the following technical solution:

[0006] The fireproof check valve includes a valve body, a first elastic element, a lever unit, and a valve plate unit. The valve body has an exhaust port. The valve plate unit and the lever unit are movably disposed on the valve body. The lever unit is also connected to the valve body through the first elastic element. The lever unit has a locked position and an unlocked position. The first elastic element is used to drive the lever unit from the locked position to the unlocked position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port.

[0007] The fireproof check valve also includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is connected to the valve body through the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is in the locking position and abuts against the locking mechanism.

[0008] The locking mechanism is also rotatably connected to the valve body. When the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit. After the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port through the lever unit.

[0009] In this invention, the fireproof check valve includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is fixedly connected to the valve body via the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is in the locked position and abuts against the locking mechanism. This design ensures that the lever unit will not directly or indirectly push the valve plate unit to close the exhaust valve, thus guaranteeing that the valve plate unit can open the exhaust port.

[0010] In this invention, the locking mechanism is also rotatably connected to the valve body. When the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body via the lever unit. After the first elastic element pushes the locking mechanism to rotate around the valve body and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port via the lever unit. The sliding connection between the locking mechanism and the valve body is used to limit the movement trajectory of the locking mechanism after it separates from the lever unit. When the movement trajectory of the locking mechanism is limited by the valve body, the valve body can further ensure the reliability of the locking mechanism's movement stroke.

[0011] Because the locking mechanism is rotatably connected to the valve body, it remains connected even when the temperature sensing mechanism stops operating. This structure effectively prevents the locking mechanism from being lost after the temperature sensing mechanism ceases operation.

[0012] Furthermore, the locking mechanism is detachably mounted on the temperature sensing mechanism, and / or the temperature sensing mechanism is detachably mounted on the valve body. The detachable temperature sensing mechanism facilitates replacement, and the detachable locking mechanism facilitates replacement. This design reduces the maintenance cost and time of the fireproof check valve, enabling on-site replacement of components, especially the complete replacement of the temperature sensing and locking mechanisms.

[0013] Furthermore, the fireproof check valve also includes a limiting mechanism. The locking mechanism has a mating part that cooperates with the limiting mechanism. During the process where the first elastic element pushes the locking mechanism to rotate around the valve body via the lever unit, the limiting mechanism limits the rotation range of the locking mechanism relative to the valve body through the mating part. This design allows the limiting mechanism to initially position the locking mechanism on the valve body, facilitating subsequent installation of the temperature sensing mechanism.

[0014] Furthermore, the limiting mechanism includes a limiting rod disposed on the valve body. The axis of the rotatable connection between the locking mechanism and the valve body is not parallel to the axis of the limiting rod. The locking mechanism has a through hole, which serves as the mating part. The diameter of the through hole is larger than the diameter of the limiting rod, and the limiting rod passes through the through hole. During the process where the first elastic element pushes the locking mechanism to rotate around the valve body via the lever unit, the limiting rod limits the rotation range of the locking mechanism relative to the valve body through the through hole. This design simplifies the structure of the limiting mechanism and the mating structure between the locking mechanism and the limiting mechanism.

[0015] Furthermore, the valve body includes a main body and a mounting base, the mounting base being disposed on the main body, and the temperature sensing mechanism and the limiting mechanism being detachably disposed on the mounting base; or, the valve body includes a main body and a mounting base, the mounting base being disposed on the main body via the temperature sensing mechanism or the limiting mechanism. This design reduces the impact on the main body when replacing the temperature sensing mechanism and the limiting mechanism.

[0016] Furthermore, the locking mechanism includes a locking plate, which, from the inside out, is provided with a transition portion, a connecting portion, a mating portion, and an abutment block. The locking plate is rotatably connected to the valve body via the transition portion, connected to the temperature sensing mechanism via the connecting portion, and abuts against the lever unit via the abutment block. This design, without changing the size of the locking plate, increases the rotation range of the locking plate by increasing the distance between the transition portion and the mating portion.

[0017] Furthermore, the valve plate unit includes at least one valve plate, each valve plate comprising a metal plate and a flexible ring. The metal plate has a circumferential bend, and the flexible ring is fitted onto the bend. This design increases the difficulty for the flexible ring to detach from the metal plate.

[0018] Furthermore, the valve plate unit and the lever unit are rotatably connected to the valve body, with the rotatable connection between the valve plate unit and the valve body located below the rotatable connection between the lever unit and the valve body. By raising the lever unit to close the valve plate unit, the distance between the rotatable connection between the valve plate unit and the valve body and the lever unit and the valve body is increased. This design effectively enhances the force with which the valve plate on the fireproof check valve closes the exhaust port.

[0019] Furthermore, the fireproof check valve also includes an air guide hood, which is fixedly connected to the valve body. After the air guide hood is fixedly connected to the valve body, an air guide channel is formed. The cross-sectional area of ​​the lower end of the air guide channel is smaller than the cross-sectional area of ​​the upper end of the air guide channel.

[0020] Furthermore, the temperature sensing mechanism includes an outer fusible link and an inner fusible link. The locking mechanism is located on the inner fusible link, and the outer fusible link is located on the outer wall of the valve body. When the outer fusible link is located on the outer wall of the valve body, it penetrates the valve body and connects to the inner fusible link. Alternatively, the temperature sensing mechanism includes an outer fusible link and an inner fusible link, with the locking mechanism located on the inner fusible link and the outer fusible link located on the outer wall of the valve body. When the outer fusible link is located on the outer wall of the valve body, the inner fusible link penetrates the valve body and connects to the outer fusible link. With this design, the temperature sensing mechanism can start working when either the inner or outer fusible link is heated.

[0021] Alternatively, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector. The connector penetrates the valve body. The outer fusible link is clamped between the connector and the outer wall of the valve body, and the inner fusible link is clamped between the connector and the inner wall of the valve body. The connector has strong resistance to deformation, effectively reducing the probability of separation between the outer and inner fusible links at room temperature. The outer fusible link being clamped between the connector and the outer wall of the valve body effectively shortens the installation time and reduces the installation difficulty of the outer fusible link. Similarly, the inner fusible link being clamped between the connector and the inner wall of the valve body effectively shortens the installation time and reduces the installation difficulty of the inner fusible link.

[0022] Alternatively, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector, the connector penetrating the valve body, the outer fusible link clamped between the connector and the outer wall of the valve body, and the locking mechanism connected to the connector via the inner fusible link; or, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector, the connector penetrating the valve body, the connector and the outer fusible link connected to the outer wall of the valve body, and the inner fusible link clamped between the connector and the inner wall of the valve body; or, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector, the connector penetrating the valve body, the connector and the outer fusible link connected to the outer wall of the valve body, and the locking mechanism connected to the connector via the inner fusible link. Attached Figure Description

[0023] Figure 1 This is a perspective view of the fireproof check valve in a preferred embodiment of the present invention;

[0024] Figure 2 This is a perspective view of the fireproof check valve in a preferred embodiment of the present invention (valve plate unit omitted);

[0025] Figure 3 This is a rear view of the fireproof check valve in a preferred embodiment of the present invention;

[0026] Figure 4 for Figure 3 Sectional view at point AA;

[0027] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0028] Figure 6 This is a perspective view of the locking mechanism, mounting base, and temperature sensing mechanism in a preferred embodiment of the present invention. Detailed Implementation

[0029] 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.

[0030] See Figure 1 and Figure 2 The fireproof check valve includes a valve body 1, a first elastic element (unmarked), a lever unit 3, and a valve plate unit 4. The valve body 1 has an exhaust port 111. The valve plate unit 2 and the lever unit 3 are movably mounted on the valve body 1. The lever unit 3 is also connected to the valve body 1 via the first elastic element. The lever unit 3 has a locked position (e.g., ...). Figure 1 and Figure 2 As shown, the lever unit 3 is in the locked position and the unlocked position. The first elastic element is used to drive the lever unit 3 from the locked position to the unlocked position so that the lever unit 3 directly or indirectly pushes the valve plate unit 2 to close the exhaust port 111.

[0031] In this embodiment, the fireproof check valve further includes a second elastic element (unmarked). The valve plate unit 2 includes a valve plate, which is rotatably connected to the valve body 1. The valve plate and the valve body 1 are also connected via the second elastic element. Under normal temperature conditions, the range hood blows oil fumes to rotate the valve plate relative to the valve body 1 to open the exhaust port 111. The second elastic element drives the valve plate to rotate relative to the valve body 1 to close the exhaust port 111. In other embodiments of the present invention, the valve plate can also rotate relative to the valve body under the action of gravity to close the exhaust port; or, the valve plate is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the valve body. The connecting rod rotates relative to the valve body to drive the valve plate to close the exhaust port, and the lever unit indirectly pushes the valve plate unit to close the exhaust port through the connecting rod.

[0032] In this embodiment, the lever unit 3 includes a lever that pushes the valve plate to directly close the exhaust port 111. The number of levers is preferably the same as the number of valve plates. Of course, under certain circumstances, the number of levers may be more or less than the number of valve plates.

[0033] In this embodiment, the lever is rotatably connected to the valve body 1. In other embodiments of the present invention, the lever may also be slidably connected to the valve body.

[0034] Furthermore, in other embodiments of the present invention, the number of valve plates included in the valve plate unit is not limited to one; the valve plate unit may also include two, three, four, six, nine, or other valve plates. Similarly, in other embodiments of the present invention, the number of levers included in the lever unit is not limited to one; the lever unit may also include two, three, four, six, nine, or other levers.

[0035] Preferably, the first elastic element is a first torsion spring, which is sleeved on the lever. One torsion arm of the first torsion spring is connected to the valve body 1, and the other torsion arm of the first torsion spring is connected to the lever. In other embodiments of the present invention, the first elastic element may be a first tension spring or a first compression spring.

[0036] Preferably, the second elastic element is a second torsion spring, which is sleeved on the valve plate. One torsion arm of the second torsion spring is connected to the valve body 1, and the other torsion arm of the second torsion spring is connected to the valve plate. In other embodiments of the present invention, the second elastic element may be a second tension spring or a second compression spring.

[0037] See Figure 3 , Figure 4 and Figure 5 The difference from the existing technology is that the fireproof check valve also includes a locking mechanism 4 and a temperature sensing mechanism 5. The locking mechanism 4 is connected to the valve body 1 through the temperature sensing mechanism 5. When the temperature sensing mechanism 5 is working, the lever unit 3 is in the locked position and abuts against the locking mechanism 4.

[0038] The locking mechanism 4 is also rotatably connected to the valve body 1. When the temperature sensing mechanism 5 stops working, the first elastic element pushes the locking mechanism 4 to rotate around the valve body 1 through the lever unit 3. After the first elastic element pushes the locking mechanism 4 to rotate around the valve body 1 through the lever unit 3 and separates from the locking mechanism 4, the first elastic element directly or indirectly pushes the valve plate unit 2 to close the exhaust port 111 through the lever unit 3.

[0039] In this embodiment, the locking mechanism 4 is detachably disposed on the temperature sensing mechanism 5, and / or the temperature sensing mechanism 5 is detachably disposed on the valve body 1.

[0040] See Figure 6 The fireproof check valve also includes a limiting mechanism (not marked). The locking mechanism 4 is provided with a mating part 43 that cooperates with the limiting mechanism. During the process of the first elastic element pushing the locking mechanism 4 to rotate around the valve body 1 through the lever unit 3, the limiting mechanism limits the rotation range of the locking mechanism 4 relative to the valve body 1 through the mating part 43.

[0041] In this embodiment, the limiting mechanism includes a limiting rod disposed on the valve body 1. The axis of the locking mechanism 4 and the valve body 1 at the rotatable connection is not parallel to the axis of the limiting rod. The locking mechanism 4 has a through hole, which is a mating part 43. The diameter of the through hole is larger than the diameter of the limiting rod, and the limiting rod passes through the through hole. During the process of the first elastic element pushing the locking mechanism 4 to rotate around the valve body 1 through the lever unit 3, the limiting rod limits the rotation range of the locking mechanism 4 relative to the valve body 1 through the through hole. In other embodiments of the present invention, the limiting mechanism includes an arc-shaped groove, and the locking mechanism has a protrusion that mates with the arc-shaped groove.

[0042] Preferably, the through hole is a rectangular hole and the limiting rod is a circular rod.

[0043] See Figure 1 and Figure 5 The valve body 1 includes a body 11 and a mounting base 12, with the mounting base 12 disposed on the body 11. The temperature sensing mechanism 5 and the limiting mechanism are detachably disposed on the mounting base 12. In other embodiments of the present invention, the valve body includes a body and a mounting base, with the mounting base disposed on the body via the temperature sensing mechanism or the limiting mechanism.

[0044] See Figure 6 The locking mechanism 4 includes a locking plate, which, from the inside out, is provided with a transition portion 41, a connecting portion 42, a mating portion 43, and an abutment block 44. The locking plate 4 is rotatably connected to the valve body 1 through the transition portion 41, connected to the temperature sensing mechanism 5 through the connecting portion 43, and abuts against the lever unit 3 through the abutment block 44. In other embodiments of the present invention, the positional relationship of the transition portion, connecting portion, mating portion, and abutment block on the locking plate can be changed.

[0045] Furthermore, in other embodiments of the present invention, the adapter, connecting part, mating part, and abutting block may also be provided on different components of the locking mechanism, and the locking mechanism is formed after the different components are assembled.

[0046] See Figure 4 The valve plate unit includes at least one valve plate (unmarked), the valve plate includes a metal plate (unmarked) and a flexible ring (unmarked), the metal plate has a circumferential bend 21, and the flexible ring is sleeved on the bend 21.

[0047] from Figure 1 and Figure 3 It can be seen that the valve plate unit 2 and the lever unit 3 are rotatably connected to the valve body 1, and the rotatable connection between the valve plate unit 2 and the valve body 1 is located below the rotatable connection between the lever unit 3 and the valve body 1.

[0048] Preferably, the fireproof check valve also includes an air guide hood (unmarked), which is fixedly connected to the valve body 1. After the air guide hood is fixedly connected to the valve body 1, an air guide channel is formed. The cross-sectional area of ​​the lower end of the air guide channel is smaller than the cross-sectional area of ​​the upper end of the air guide channel.

[0049] See Figure 4 and Figure 5 The temperature sensing mechanism 5 includes an outer fuse assembly 52 and an inner fuse assembly 51. The locking mechanism 4 is located on the inner fuse assembly 51, and the outer fuse assembly 52 is located on the outer wall of the valve body 1. When the outer fuse assembly 52 is located on the outer wall of the valve body 1, the outer fuse assembly 52 penetrates the valve body 1 and connects to the inner fuse assembly 51. Specifically, the inner fuse assembly 51 includes an inner brazing ring, and the outer fuse assembly 52 includes a metal sleeve 521, an outer brazing ring 522, and a connector rod. 523. The outer brazing ring 522 and the plug rod 523 are inserted into the metal sleeve 521. The metal sleeve 521 is fixedly connected to the valve body 1. When the metal sleeve 521 is fixedly connected to the valve body 1, the outer end of the outer brazing ring 522 abuts against the inner wall of the metal sleeve 521, and the inner end of the outer brazing ring 522 abuts against the outer end of the plug rod 523. The inner end of the plug rod 523 penetrates the valve body 1 and is inserted into the inner brazing ring. The locking mechanism 4 is fixedly connected to the inner brazing ring. When the outdoor temperature is high, the outer brazing ring 522 melts. The melting of the outer brazing ring 522 means that the temperature sensing mechanism 5 stops working. The plug rod 523 separates from the inner brazing ring under its own gravity. When the inner brazing ring loses the constraint of the plug rod 523 and has a certain gap with the inner wall of the valve body 1, the second elastic element 6 drives the locking mechanism 4 to separate from the lever unit 3. When the indoor temperature is high, the inner brazing ring melts. The melting of the inner brazing ring means that the temperature sensing mechanism 5 stops working. After the inner brazing ring melts, the locking mechanism 4 loses the constraint of the temperature sensing mechanism 5, and the second elastic element 6 drives the locking mechanism 4 to separate from the lever unit 3.

[0050] In this embodiment, the temperature sensing mechanism 5 is in working condition when the inner solder ring and / or the outer solder ring 522 have not melted.

[0051] In other embodiments of the present invention, the temperature sensing mechanism includes an outer fusible component and an inner fusible component, the locking mechanism is disposed on the inner fusible component, and the outer fusible component is disposed on the outer wall of the valve body. When the outer fusible component is disposed on the outer wall of the valve body, the inner fusible component penetrates the valve body and is connected to the outer fusible component; or, the temperature sensing mechanism includes an outer fusible component, an inner fusible component, and a connector, the connector penetrates the valve body, the outer fusible component is clamped between the connector and the outer wall of the valve body, and the inner fusible component is clamped between the connector and the inner wall of the valve body; or, the temperature sensing mechanism includes an outer fusible component, an inner fusible component, and a connector, the connector... The outer fusible link extends through the valve body, and is clamped between the connector and the outer wall of the valve body. The locking mechanism is connected to the connector via the inner fusible link. Alternatively, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector. The connector extends through the valve body, and is connected to the outer fusible link and the outer wall of the valve body. The inner fusible link is clamped between the connector and the inner wall of the valve body. Alternatively, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector. The connector extends through the valve body, and is connected to the outer fusible link and the outer wall of the valve body. The locking mechanism is connected to the connector via the inner fusible link.

[0052] 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, comprising a valve body, a first elastic element, a lever unit, and a valve plate unit, wherein the valve body has an exhaust port, the valve plate unit and the lever unit are movably disposed on the valve body, the lever unit is also connected to the valve body via the first elastic element, the lever unit has an unlocked position and a locked position, the first elastic element is used to drive the lever unit from the locked position to the unlocked position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port, characterized in that... It also includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is connected to the valve body through the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is in the locked position and abuts against the locking mechanism. The locking mechanism is also rotatably connected to the valve body. When the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit. After the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port through the lever unit. The fireproof check valve also includes a limiting mechanism. The locking mechanism is provided with a mating part that cooperates with the limiting mechanism. When the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit, the limiting mechanism limits the rotation range of the locking mechanism relative to the valve body through the mating part. The limiting mechanism includes a limiting rod disposed on the valve body. The axis of the rotatable connection between the locking mechanism and the valve body is not parallel to the axis of the limiting rod. The locking mechanism has a through hole, which is the mating part. The diameter of the through hole is larger than the diameter of the limiting rod. The limiting rod passes through the through hole. During the process of the first elastic element pushing the locking mechanism to rotate around the valve body through the lever unit, the limiting rod limits the rotation range of the locking mechanism relative to the valve body through the through hole.

2. The fireproof check valve as described in claim 1, characterized in that, The locking mechanism is detachably disposed on the temperature sensing mechanism, and / or the temperature sensing mechanism is detachably disposed on the valve body.

3. The fireproof check valve as described in claim 1, characterized in that, The valve body includes a main body and a mounting base, the mounting base being disposed on the main body, and the temperature sensing mechanism and the limiting mechanism being detachably disposed on the mounting base; or, the valve body includes a main body and a mounting base, the mounting base being disposed on the main body via the temperature sensing mechanism or the limiting mechanism.

4. The fireproof check valve as described in claim 1, characterized in that, The locking mechanism includes a locking plate, which has a transition part, a connecting part, a mating part and an abutment block arranged sequentially from the inside to the outside. The locking plate is rotatably connected to the valve body through the transition part, the locking plate is connected to the temperature sensing mechanism through the connecting part, and the locking plate abuts against the lever unit through the abutment block.

5. The fireproof check valve as described in claim 1, characterized in that, The valve plate unit includes at least one valve plate, each valve plate including a metal plate and a flexible ring, the metal plate having a circumferential bend, and the flexible ring being sleeved on the bend.

6. The fireproof check valve as described in claim 1, characterized in that, The valve plate unit and the lever unit are rotatably connected to the valve body, and the rotatable connection between the valve plate unit and the valve body is located below the rotatable connection between the lever unit and the valve body.

7. The fireproof check valve as described in claim 1, characterized in that, The fireproof check valve also includes an air guide cover, which is fixedly connected to the valve body. After the air guide cover is fixedly connected to the valve body, an air guide channel is formed. The cross-sectional area of ​​the lower end of the air guide channel is smaller than the cross-sectional area of ​​the upper end of the air guide channel.

8. The fireproof check valve as described in claim 1, characterized in that, The temperature sensing mechanism includes an outer fusible link and an inner fusible link. A locking mechanism is located on the inner fusible link, and the outer fusible link is located on the outer wall of the valve body. When the outer fusible link is located on the outer wall of the valve body, it penetrates the valve body and connects to the inner fusible link. Alternatively, the temperature sensing mechanism includes an outer fusible link and an inner fusible link, with the locking mechanism located on the inner fusible link and the outer fusible link located on the outer wall of the valve body. When the outer fusible link is located on the outer wall of the valve body, the inner fusible link penetrates the valve body and connects to the outer fusible link. Alternatively, the temperature sensing mechanism includes an outer fusible link, an inner fusible link, and a connector. The connector penetrates the valve body, the outer fusible link is clamped between the connector and the outer wall of the valve body, and the inner fusible link is clamped to the connector. The temperature sensing mechanism comprises an outer fusible link, an inner fusible link, and a connector, wherein the connector penetrates the valve body, the outer fusible link is clamped between the connector and the outer wall of the valve body, and the locking mechanism is connected to the connector via the inner fusible link; or, the temperature sensing mechanism comprises an outer fusible link, an inner fusible link, and a connector, wherein the connector penetrates the valve body, the connector and the outer fusible link are connected to the outer wall of the valve body, and the inner fusible link is clamped between the connector and the inner wall of the valve body; or, the temperature sensing mechanism comprises an outer fusible link, an inner fusible link, and a connector, wherein the connector penetrates the valve body, the connector and the outer fusible link are connected to the outer wall of the valve body, and the locking mechanism is connected to the connector via the inner fusible link.

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