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 an unlocking position and a locking position, and the first elastic element is used to drive the lever unit to move from the unlocking position to the locking 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 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.

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

[0008] The locking mechanism is slidably connected to the valve body. When the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under its own weight or external force and separates from 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 slidably connected to the valve body. When the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under its own weight or external force and separates from the lever unit. The slidable 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 movement stroke of the locking mechanism.

[0011] Because the locking mechanism is slidably 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 valve body is provided with a guide rail that cooperates with the locking mechanism. When the temperature sensing mechanism stops working, the locking mechanism slides along the guide rail and separates from the lever unit. The guide rail is used to maintain the stability of the locking mechanism during its sliding along the valve body. In addition, the guide rail defines the position of the locking mechanism relative to the valve body, facilitating connection with the temperature sensing mechanism.

[0013] Furthermore, the valve body includes a main body and a first column. The exhaust port is located on the main body, and the first column is fixedly connected to the main body. The guide rail is located on the first column. When the temperature sensing mechanism operates and the locking mechanism cooperates with the guide rail, the contact point between the lever unit and the locking mechanism is located between the exhaust port and the first column. This structure protects the contact point between the lever unit and the locking mechanism, preventing them from being separated by external force.

[0014] Furthermore, the first column is detachably mounted on the main body, the temperature sensing mechanism is detachably mounted on the first column and / or the main body, and the locking mechanism is detachably mounted on the temperature sensing mechanism. The detachable first column facilitates replacement of the main body, the detachable temperature sensing mechanism facilitates replacement of the temperature sensing mechanism, and the detachable locking mechanism facilitates replacement of the locking mechanism. 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 mechanism and locking mechanism.

[0015] Furthermore, the lever unit is detachably mounted on the first column, and the valve body also includes a guide shroud fixedly connected to the main body; and / or, the valve body also includes a second column, the valve plate unit is movably mounted on the second column, the second column is detachably mounted on the main body, and the inner side of the main body is provided with a receiving groove for accommodating the second column. When the lever unit is detachably mounted on the first column, the lever unit is easy to replace, and the receiving groove on the main body does not require drilling a hole in the valve body to install the lever unit. When the valve plate unit is movably mounted on the second column, the valve plate unit is easy to replace, and there is no need to drill a hole in the valve body to install the valve plate unit. In addition, the receiving groove on the inner side of the main body is used to change the position of the exhaust port and the valve plate unit, so as to realize that the valve plate unit fits against the main body and closes the exhaust port.

[0016] Furthermore, a second elastic element is included. The locking mechanism is movably connected to the valve body via the second elastic element. When the temperature sensing mechanism stops working, the second elastic element drives the locking mechanism to slide along the guide rail, thus separating the locking mechanism from the lever unit. The second elastic element provides a driving force for the locking mechanism to separate from the lever unit, driving the locking mechanism to move while the outer and / or inner solder assemblies are not fully melted. This design shortens the time required for the lever unit to directly or indirectly close the exhaust port through the valve plate unit.

[0017] The second elastic element provides an auxiliary driving force for the first elastic element to drive the lever's movement. This design reduces the driving force required to initiate the lever's rotation.

[0018] Furthermore, the locking mechanism includes a locking plate, which has a slot for abutting the lever unit and a mounting portion for connecting the second elastic element, which is a tension spring. The opening direction of the slot is not perpendicular to the central axis of the tension spring. This design reduces the driving force required for the second elastic element to move the locking plate relative to the guide rail.

[0019] Furthermore, the slot is formed by an inward recess in the top wall of the locking plate, and the side walls of the slot are inclined, with an inclined transition between the side walls of the slot and the top wall of the locking plate. The side walls guide the locking plate into the slot. This structure reduces the requirements for manufacturing precision and installation position accuracy of the locking plate and the lever unit, and also reduces the difficulty of inserting the lever unit into the locking plate.

[0020] Furthermore, the guide rail serves as a guide channel, and the locking mechanism further includes a guide rod and a mounting plate. The temperature sensing mechanism is located on the mounting plate, the guide rod passes through the guide channel, the locking plate is located at one end of the guide rod near the valve plate unit, and the mounting plate is located at the other end of the guide rod away from the valve plate unit. This design prevents the locking mechanism from separating from the valve body.

[0021] Furthermore, the temperature sensing mechanism includes an outer fuse assembly and an inner fuse assembly. The locking mechanism is disposed on the inner fuse assembly, and the outer fuse assembly is disposed on the outer wall of the valve body. When the outer fuse assembly is disposed on the outer wall of the valve body, the outer fuse assembly penetrates the valve body and is connected to the inner fuse assembly.

[0022] Alternatively, 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, the inner fusible link penetrates the valve body and is connected 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.

[0023] 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.

[0024] 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

[0025] Figure 1 This is a perspective view of the fireproof check valve in a preferred embodiment of the present invention;

[0026] Figure 2 This is a perspective view of the fireproof check valve in a preferred embodiment of the present invention (valve plate unit omitted);

[0027] Figure 3This is a first perspective view of the lever unit, locking mechanism, and temperature sensing mechanism in a preferred embodiment of the present invention;

[0028] Figure 4 This is a second perspective view of the lever unit, locking mechanism, and temperature sensing mechanism in a preferred embodiment of the present invention;

[0029] Figure 5 This is a perspective view of the locking mechanism and the temperature sensing mechanism in a preferred embodiment of the present invention;

[0030] Figure 6 This is a rear view of the locking mechanism and the temperature sensing mechanism in a preferred embodiment of the present invention;

[0031] Figure 7 for Figure 6 Sectional view at point AA;

[0032] Figure 8 This is a perspective view of the first column in a preferred embodiment of the present invention. 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 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 2. 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.

[0035] In this embodiment, the fireproof check valve further includes a third elastic element. The valve plate unit 2 includes two valve plates, each valve plate being rotatably connected to the valve body 1. The exhaust port 111 includes two small exhaust ports. Each valve plate is also connected to the valve body 1 via the third 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 small exhaust ports. The third elastic element drives the valve plate to rotate relative to the valve body 1 to close the small exhaust ports. 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 small exhaust ports; 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 small exhaust ports. The lever unit indirectly pushes the valve plate unit to close the exhaust ports through the connecting rod.

[0036] In this embodiment, the lever unit 3 includes two levers, each lever pushes a valve plate to directly close the small 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.

[0037] 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.

[0038] Furthermore, in other embodiments of the present invention, the number of valve plates included in the valve plate unit is not limited to two; the valve plate unit may also include one valve plate, three valve plates, four valve plates, six valve plates, nine valve plates, etc. Similarly, in other embodiments of the present invention, the number of levers included in the lever unit is not limited to two; the lever unit may also include one lever, three levers, four levers, six levers, nine levers, etc.

[0039] 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.

[0040] Preferably, the third elastic element is a third torsion spring, which is sleeved on the valve plate. One torsion arm of the third torsion spring is connected to the valve body 1, and the other torsion arm of the third torsion spring is connected to the valve plate. In other embodiments of the present invention, the third elastic element may be a third tension spring or a third compression spring.

[0041] See Figure 2 and Figure 3 The difference from the prior art is that the fireproof check valve of the present invention also includes a locking mechanism 4 and a temperature sensing mechanism 5. The locking mechanism 4 is fixedly 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.

[0042] The locking mechanism 4 is slidably connected to the valve body 1. When the temperature sensing mechanism 5 stops working, the locking mechanism 4 slides along the valve body 1 under its own weight or external force and separates from the lever unit 3.

[0043] See Figure 1 and Figure 8 The valve body 1 is provided with a guide rail 121 that cooperates with the locking mechanism 4. When the temperature sensing mechanism 5 stops working, the locking mechanism 4 slides along the guide rail 121 and separates from the lever unit 3.

[0044] In this embodiment, the valve body 1 includes a body 11 and a first column 12. The exhaust port 111 is located on the body 11. The first column 12 is fixedly connected to the body 11. The guide rail 121 is located on the first column 12. When the temperature sensing mechanism 5 is working and the locking mechanism 4 cooperates with the guide rail 121, the contact point between the lever unit 3 and the locking mechanism 4 is located between the exhaust port 111 and the first column 12.

[0045] Preferably, the first column 12 is detachably disposed on the body 11, the temperature sensing mechanism 5 is detachably disposed on the first column 12 and / or the body 11, and the locking mechanism 4 is detachably disposed on the temperature sensing mechanism 5. In other embodiments of the present invention, the first column is fixedly connected to the body; or, the temperature sensing mechanism is fixedly connected to the first column and the body; or, the temperature sensing mechanism is fixedly connected to the first column; or, the temperature sensing mechanism is fixedly connected to the body; or, the locking mechanism is fixedly connected to the temperature sensing mechanism.

[0046] Preferably, the first column 12 is provided with a mounting plate 123 for connecting the second elastic element 6. This structure facilitates the overall assembly and disassembly of the locking mechanism 4 and the temperature sensing mechanism 5. In other embodiments of the invention, the second elastic element may also be connected to the main body.

[0047] See Figure 1 and Figure 2 The lever unit 3 is detachably mounted on the first column 12, and the valve body 1 also includes a guide shroud fixedly connected to the main body 11; the valve body 1 also includes a second column 13, the valve plate unit 2 is movably mounted on the second column 13, the second column 13 is detachably mounted on the main body 11, and the inner side of the main body 11 is provided with a receiving groove for accommodating the second column 13. In other embodiments of the present invention, the lever unit is detachably mounted on the first column, and the valve body also includes a guide shroud fixedly connected to the main body; or, the valve body also includes a second column, the valve plate unit is movably mounted on the second column, the second column is detachably mounted on the main body, and the inner side of the main body is provided with a receiving groove for accommodating the second column.

[0048] See Figure 2 , Figure 5 and Figure 8The fireproof check valve also includes a second elastic element 6. The locking mechanism 4 is movably connected to the valve body 1 through the second elastic element 6. When the temperature sensing mechanism 5 stops working, the second elastic element 6 drives the locking mechanism 4 to slide along the guide rail 121 and separates the locking mechanism 4 from the lever unit 3.

[0049] See Figure 5 The locking mechanism 4 includes a locking plate 41, which has a slot 411 for abutting the lever unit 3 and a mounting portion 412 for connecting the second elastic element 6. The second elastic element is a second tension spring, and the opening direction of the slot is not perpendicular to the central axis of the second tension spring. In other embodiments of the present invention, the second elastic element may also be a second compression spring or a second torsion spring; or, the locking plate may have an abutting plate for abutting the lever unit.

[0050] See Figure 4 and Figure 6 The slot 411 is formed by the inward recess of the top wall 4112 of the locking plate 41. The side wall 4111 of the slot 411 is inclined, and the side wall 4111 of the slot 411 and the top wall 4112 of the locking plate 41 are inclinedly transitioned.

[0051] In this embodiment, the slot 411 includes a bottom slot wall 4113 and a side slot wall 4111. The lever unit 3 is inserted into the slot 411 and abuts against the bottom slot wall 4113 and / or the side slot wall 4111.

[0052] Preferably, the mounting portion 412 is higher than the bottom groove wall 4113, and the mounting portion 412 extends outward from the bottom groove wall 4113. The mounting portion 412 can also, to some extent, prevent the lever unit 3 from shaking within the slot 411.

[0053] See Figure 6 , Figure 7 and Figure 8 The guide rail 121 serves as a guide channel. The locking mechanism 4 also includes a guide rod 42 and a mounting plate 43. The temperature sensing mechanism 5 is mounted on the mounting plate 43. The guide rod 42 passes through the guide channel. The locking plate 41 is located at one end of the guide rod 43 near the valve plate unit 2, and the mounting plate 43 is located at the other end of the guide rod 42 away from the valve plate unit 2. In other embodiments of the present invention, the guide rail may also be one of a guide groove and a guide protrusion; or, in the case where the locking mechanism only includes a locking plate, the temperature sensing mechanism is fixedly connected to the locking plate.

[0054] See Figure 2 , Figure 6 and Figure 7The 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.

[0055] 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.

[0056] 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.

[0057] 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 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, characterized in that... It also includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is fixedly connected to the valve body through the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is located in the locking position and abuts against the locking mechanism. The locking mechanism is slidably connected to the valve body. When the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under its own weight or external force and separates from the lever unit. The valve body is provided with a guide rail that cooperates with the locking mechanism. The valve body includes a main body and a first column. The exhaust port is located on the main body. The first column is fixedly connected to the main body. The guide rail is located on the first column. When the temperature sensing mechanism is working and the locking mechanism cooperates with the guide rail, the contact point between the lever unit and the locking mechanism is located between the exhaust port and the first column. 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.

2. The fireproof check valve as described in claim 1, characterized in that, When the temperature sensing mechanism stops working, the locking mechanism slides along the guide rail and separates from the lever unit.

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

4. The fireproof check valve as described in claim 3, characterized in that, The lever unit is detachably mounted on the first column, and the valve body further includes an air guide shroud fixedly connected to the main body; and / or, the valve body further includes a second column, the valve plate unit is movably mounted on the second column, the second column is detachably mounted on the main body, and the inner side of the main body is provided with a receiving groove for receiving the second column.

5. The fireproof check valve as described in claim 2, characterized in that, It also includes a second elastic element, and the locking mechanism is movably connected to the valve body through the second elastic element. When the temperature sensing mechanism stops working, the second elastic element drives the locking mechanism to slide along the guide rail and separates the locking mechanism from the lever unit.

6. The fireproof check valve as described in claim 5, characterized in that, The locking mechanism includes a locking plate, which has a slot for abutting the lever unit and a mounting part for connecting the second elastic element. The second elastic element is a tension spring, and the opening direction of the slot is not perpendicular to the central axis of the tension spring.

7. The fireproof check valve as described in claim 6, characterized in that, The slot is formed by an inward recess in the top wall of the locking plate, the side wall of the slot is inclined, and the side wall of the slot transitions inclinedly with the top wall of the locking plate.

8. The fireproof check valve as described in claim 6, characterized in that, The guide rail serves as a guide channel. The locking mechanism further includes a guide rod and a mounting plate. The temperature sensing mechanism is located on the mounting plate. The guide rod passes through the guide channel. The locking plate is located at one end of the guide rod near the valve plate unit, and the mounting plate is located at the other end of the guide rod away from the valve plate unit.

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