Fireproof check valve

Abstract

The utility model provides a fireproof check valve, and relates to the technical field of check valves, the fireproof check valve comprises a valve body, a valve plate and a fireproof rod, the valve plate is rotatably connected with the valve body through a first rotating shaft; the fireproof rod is movably connected with the valve body, and the fireproof rod can move in the second direction after being unlocked so as to push the valve plate to close the air outlet; the fireproof rod is located on the rear side of the valve block, a pressing inclined face and an abutting plane which are in sliding contact with the fireproof rod are sequentially arranged on the rear side face of the valve block, and the tail end of the pressing inclined face is connected with the head end of the abutting plane. When the valve plate is in a state of sealing the air outlet, the fireproof rod is propped against the propping plane, and the front-back distance between the pressing inclined plane and the vertical plane where the fireproof rod is located is gradually reduced in the direction from the head end of the pressing inclined plane to the tail end of the pressing inclined plane; the abutting plane is parallel to the vertical plane where the fireproof rod is located.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a fireproof check valve. Background Art

[0002] The fireproof check valve comprises a valve body, a valve disc and a fireproof rod. The valve disc is rotatably connected with the valve body. When a fire occurs, a fuse piece is fused, and the fireproof rod moves towards the valve disc driven by a spring to push the valve disc so as to close a smoke guide hole on the valve body.

[0003] However, the existing fireproof check valve has insufficient sealing performance, and the valve disc is prone to accidental opening when a fire occurs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fireproof check valve to alleviate the technical problems of insufficient sealing performance and easy accidental opening of the existing fireproof check valve.

[0005] In a first aspect, a fireproof check valve provided by the utility model comprises: a valve body, a valve disc and a fireproof rod. The valve disc is rotatably connected with the valve body through a first rotating shaft and is used for opening and closing an air outlet of the valve body. The first rotating shaft extends along a first direction; the fireproof rod is movably connected with the valve body, and the fireproof rod can move along a second direction after being unlocked to push the valve disc to close the air outlet; both the first direction and the second direction are perpendicular to the front-back direction;

[0006] The fireproof rod is located at the rear side of the valve disc. A pressing inclined surface and an abutting plane which are in sliding contact with the fireproof rod are sequentially arranged on the rear side surface of the valve disc. The end of the pressing inclined surface is connected with the head of the abutting plane so that in the process of switching from the unlocked state to the blocking state, the fireproof rod contacts with the pressing inclined surface and the abutting plane successively;

[0007] When the valve disc is in a state of closing the air outlet, the fireproof rod abuts against the abutting plane, and in the direction from the head of the pressing inclined surface towards the tail of the pressing inclined surface, the front-back distance between the pressing inclined surface and the vertical plane where the fireproof rod is located gradually decreases; the abutting plane is parallel to the vertical plane where the fireproof rod is located.

[0008] Furthermore, a limiting surface is further arranged on the valve disc. The end of the abutting plane is connected with the limiting surface, and the limiting surface is used for preventing the fireproof rod from sliding out from the tail of the abutting plane.

[0009] Furthermore, from front to back, the limiting surface inclines towards the side of the abutting plane so that the included angle between the abutting plane and the limiting surface is less than 90°, which is used for preventing the fireproof rod from contacting with a turning fillet formed at the transition between the abutting plane and the limiting surface.

[0010] Furthermore, a stop portion protruding towards the side where the abutting plane is located is provided on the limiting surface. The stop portion contacts the fire prevention rod to prevent the fire prevention rod from contacting the turning fillet formed at the transition between the abutting plane and the limiting surface.

[0011] Furthermore, a protruding portion is provided on the side wall of the fire prevention rod. The protruding portion is spaced from the abutting end portion of the fire prevention rod. The protruding portion contacts the limiting surface to prevent the fire prevention rod from contacting the turning fillet formed at the transition between the abutting plane and the limiting surface.

[0012] Furthermore, an inclined boss protruding from the front side towards the rear side is provided on the valve plate. The rear side of the inclined boss is an inclined surface. A sunken platform recessed from the rear to the front is provided on the inclined surface. The bottom surface of the sunken platform forms the abutting plane, and the side wall of the sunken platform close to the high end of the inclined surface forms the limiting surface; in the inclined surface, the portion from the bottom end of the inclined surface to the sunken platform forms the pressing inclined surface.

[0013] Furthermore, an inclined boss protruding from the front side towards the rear side is provided on the valve plate. The rear side of the inclined boss is a continuously bent surface. The continuously bent surface includes an inclined surface, a horizontal surface, and a vertical surface sequentially connected from the bottom end to the top end. The inclined surface forms the pressing inclined surface, the horizontal surface forms the abutting plane, and the vertical surface forms the limiting surface.

[0014] Furthermore, the abutting end of the fire prevention rod is a round head.

[0015] Furthermore, the first rotating shaft can rotate relative to the valve body. A one-way rotating assembly is correspondingly provided on the first rotating shaft and the valve body, so that the valve plate can only rotate in one direction to close the air outlet.

[0016] Furthermore, the one-way rotating assembly includes a ratchet provided on the first rotating shaft and a pawl provided on the valve body.

[0017] The present utility model at least has the following advantages or beneficial effects:

[0018] The fire prevention check valve provided by the utility model comprises: a valve body, a valve disc and a fire prevention rod. The valve disc is rotatably connected to the valve body through a first rotating shaft and is used for opening and closing the air outlet of the valve body. The first rotating shaft extends along a first direction. The fire prevention rod is movably connected to the valve body and can move along a second direction after being unlocked to push the valve disc to close the air outlet. Both the first direction and the second direction are perpendicular to the front-back direction. The fire prevention rod is located at the rear side of the valve disc. A pressing inclined plane and an abutting plane which are in sliding contact with the fire prevention rod are sequentially arranged on the rear side surface of the valve disc. The end of the pressing inclined plane is connected to the head of the abutting plane, so that in the process of switching from the unlocked state to the stopping state, the fire prevention rod contacts the pressing inclined plane and the abutting plane successively. When the valve disc is in the state of closing the air outlet, the fire prevention rod abuts against the abutting plane, and in the direction from the head of the pressing inclined plane to the tail of the pressing inclined plane, the front-back distance between the pressing inclined plane and the vertical plane where the fire prevention rod is located gradually decreases. The abutting plane is parallel to the vertical plane where the fire prevention rod is located.

[0019] When a fire occurs, after the fire prevention rod loses its restriction, it can move towards the valve disc. The abutting end of the fire prevention rod first comes into sliding contact with the pressing inclined plane on the rear side surface of the valve disc. Because when the valve disc is in the state of closing the air outlet, in the direction from the head of the pressing inclined plane to the tail of the pressing inclined plane, the front-back distance between the pressing inclined plane and the vertical plane where the fire prevention rod is located gradually decreases, so during the movement of the fire prevention rod, it will gradually push the valve disc towards the front side, so that the valve disc is pressed against the air outlet of the valve body, and the valve disc and the valve body are sealed more tightly. The fire prevention rod continues to move until it slides onto the abutting plane and stops moving. At this time, the fire prevention rod stops on the abutting plane, and the force exerted on the fire prevention rod by the abutting plane is generally along the front-back direction, and this direction is perpendicular to the movement direction of the fire prevention rod. When a fire occurs, the valve disc has a tendency to open due to the pressure, and the fire prevention rod prevents the valve disc from opening. In this solution, through the arrangement of the abutting plane, it can be avoided that the fire prevention rod moves on the plane perpendicular to the front-back direction under the push of the valve disc, that is, the position of the fire prevention rod will not change easily, and a stable abutting effect on the valve disc is formed. Therefore, the valve disc can be sealed more tightly. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1Schematic diagram of the fire prevention check valve provided by the embodiment of the present utility model (valve disc opened);

[0022] Figure 2 Schematic diagram of the fire prevention check valve provided by the embodiment of the present utility model (valve disc closed);

[0023] Figure 3 For Figure 2 Partial enlarged view of position A in

[0024] Figure 4 Schematic diagram of another fire prevention check valve provided by the embodiment of the present utility model;

[0025] Figure 5 For Figure 4 Partial enlarged view of position B in

[0026] Figure 6 Schematic diagram of the first limiting structure in the fire prevention check valve provided by the embodiment of the present utility model;

[0027] Figure 7 Schematic diagram of the second limiting structure in the fire prevention check valve provided by the embodiment of the present utility model;

[0028] Figure 8 Schematic diagram of the third limiting structure in the fire prevention check valve provided by the embodiment of the present utility model.

[0029] Icon: 100 - valve body; 110 - air outlet;

[0030] 200 - valve disc; 210 - inclined boss; 211 - pressing inclined surface; 212 - abutting plane; 213 - limiting surface; 2131 - stopping portion;

[0031] 300 - fire prevention rod; 330 - abutting end; 331 - protruding portion;

[0032] 400 - fuse piece;

[0033] 510 - ratchet; 520 - ratchet pawl. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Accordingly, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0036] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] Such as Figure 1 and Figure 2As shown in the figure, the fire prevention check valve provided by the utility model includes: a valve body 100, a valve disc 200 and a fire prevention rod 300. The valve body 100 is docked with a common flue. The valve disc 200 is rotatably connected to the valve body 100 through a first rotating shaft for opening and closing an air outlet 110 of the valve body 100. In this embodiment, the first rotating shaft extends in the left-right direction, and the lower end of the valve disc 200 is connected to the lower end of the valve body 100. In other feasible solutions, the connection position between the valve disc 200 and the valve body 100 can be the upper end, the left side or the right side, and the extending direction of the corresponding first rotating shaft also changes accordingly.

[0041] The fire prevention rod 300 is movably connected to the valve body 100, which can be a linear sliding connection or a rotational connection. The fire prevention rod 300 can move along a second direction after being unlocked to push the valve disc 200 to close the air outlet 110. In this embodiment, the fire prevention rod 300 is rotationally connected to the valve body 100, and the rotation plane of the fire prevention rod 300 is perpendicular to the front-back direction. When observing from the rear side of the valve disc 200, the fire prevention rod 300 rotates clockwise to switch to the locked state.

[0042] As Figure 3 shown in the figure, the fire prevention rod 300 is located at the rear side of the valve disc 200. A pressing inclined surface 211 and an abutting plane 212 that are in sliding contact with the fire prevention rod 300 are sequentially arranged on the rear side surface of the valve disc 200. The pressing inclined surface 211 and the abutting plane 212 are continuously arranged. The end of the pressing inclined surface 211 is connected to the beginning of the abutting plane 212. During the process of switching from the unlocked state to the stopping state, the fire prevention rod 300 contacts the pressing inclined surface 211 and the abutting plane 212 successively. When the valve disc 200 is in the state of closing the air outlet 110, that is, when the valve disc 200 is closed, the fire prevention rod 300 abuts on the abutting plane 212. In the direction from the beginning of the pressing inclined surface 211 towards the end of the pressing inclined surface 211, the front-back distance between the pressing inclined surface 211 and the vertical plane where the fire prevention rod 300 is located gradually decreases. That is to say, the abutting end 330 of the fire prevention rod 300 slides from the beginning of the pressing inclined surface 211 onto the pressing inclined surface 211 and pushes it forward. As the fire prevention rod 300 moves towards the end of the pressing inclined surface 211, the pressing degree increases. The abutting plane 212 is connected to the end of the pressing inclined surface 211, and the abutting plane 212 is parallel to the vertical plane where the fire prevention rod 300 is located, avoiding the problem that the fire prevention rod 300 slides reversely along the inclined surface, resulting in insufficient pressing of the fire prevention rod 300.

[0043] When a fire occurs, the fuse piece 400 breaks. After the fire prevention rod 300 loses its restraint, it can move towards the valve piece 200. The abutting end 330 of the fire prevention rod 300 first makes sliding contact with the pressing inclined surface 211 on the rear side of the valve piece 200. Since when the valve piece 200 is in the state of closing the air outlet 110, from the head end of the pressing inclined surface 211 towards the tail end of the pressing inclined surface 211, the front-back distance between the pressing inclined surface 211 and the vertical plane where the fire prevention rod 300 is located gradually decreases. Therefore, during the movement of the fire prevention rod 300, it will gradually push the valve piece 200 towards the front side, so that the valve piece 200 is pressed against the air outlet 110 of the valve body 100, and the valve piece 200 and the valve body 100 are sealed more tightly. The fire prevention rod 300 continues to move until the fire prevention rod 300 slides onto the abutting plane 212 and stops moving. At this time, the fire prevention rod 300 stops on the abutting plane 212, and the force exerted by the abutting plane 212 on the fire prevention rod 300 is roughly along the front-back direction, and this direction is perpendicular to the movement direction of the fire prevention rod 300. When a fire occurs, the valve piece 200 has a tendency to open due to the pressure, and the fire prevention rod 300 prevents the valve piece 200 from opening. In this solution, through the setting of the abutting plane 212, it can be avoided that the fire prevention rod 300 moves on the plane perpendicular to the front-back direction under the push of the valve piece 200, that is, the position of the fire prevention rod 300 will not change easily, and a stable abutting effect on the valve piece 200 is formed. Therefore, the valve piece 200 can be sealed more tightly.

[0044] As Figure 3 shown, a limiting surface 213 is further provided on the valve piece 200. The end of the abutting plane 212 is connected to the limiting surface 213, and the limiting surface 213 is used to prevent the fire prevention rod 300 from sliding out from the tail end of the abutting plane 212. When a fire occurs, the restraint of the fire prevention rod 300 is released, and the fire prevention rod 300 rotates from bottom to top. After passing through the pressing inclined surface 211 and the abutting plane 212 in sequence, it is blocked by the limiting surface 213. At this time, the fire prevention rod 300 moves into place and stops the rear side of the valve piece 200.

[0045] The abutting plane 212 and the limiting surface 213 are formed by bending the same plate surface. Due to process limitations, the intersection of the abutting plane 212 and the limiting surface 213 needs to be a rounded corner, and it is necessary to prevent the abutting end 330 of the fire prevention rod 300 from pressing against the rounded corner.

[0046] In order to eliminate the above problems, in the first implementable solution, from front to back, the limiting surface 213 inclines towards the abutting plane 212 side, so that the included angle between the abutting plane 212 and the limiting surface 213 is less than 90°. The rotating fire prevention rod 300 abuts against the edge away from the rounded corner in the limiting surface 213, and the rounded corner can be avoided, as Figure 6 shown.

[0047] In a second implementable solution, a stop portion 2131 protruding toward the side where the abutting plane 212 is located is provided on the limiting surface 213. The stop portion 2131 protrudes from the rounded corner position, and the stop portion 2131 contacts the fire prevention rod 300 to prevent the fire prevention rod 300 from contacting the turning rounded corner formed at the transition between the abutting plane 212 and the limiting surface 213, as Figure 7 shown.

[0048] In a third implementable solution, a protruding portion 331 is provided on the side wall of the fire prevention rod 300. The protruding portion 331 is spaced apart from the abutting end 330 of the fire prevention rod 300 and does not affect the abutting action on the valve plate 200. When the fire prevention rod 300 slides into place, the protruding portion 331 contacts the limiting surface 213, and the protruding portion 331 is away from the rounded corner to prevent the fire prevention rod 300 from contacting the turning rounded corner formed at the transition between the abutting plane 212 and the limiting surface 213, as Figure 8 shown.

[0049] In other implementable solutions, instead of using the limiting surface 213 to limit the rotation range of the fire prevention rod 300, a stop structure may be provided on the valve body 100. The stop structure is located on the rotation path of the fire prevention rod 300 to limit its maximum rotation angle.

[0050] As Figure 3 shown, an inclined boss 210 protruding from the front side to the rear side is provided on the valve plate 200. The inclined boss 210 can be formed by casting or stamping. The rear side of the inclined boss 210 is an inclined surface, and a sunken platform recessed from the rear to the front is provided on the inclined surface. The covering area of the sunken platform is smaller than that of the inclined surface. The bottom surface of the sunken platform forms the abutting plane 212, and the side wall of the sunken platform close to the high end of the inclined surface forms the limiting surface 213; in the inclined surface, the portion from the bottom end of the inclined surface to the sunken platform forms the pressing inclined surface 211. By machining the inclined boss 210 on the valve plate 200 and then machining the sunken platform on the inclined boss 210, the pressing inclined surface 211, the abutting plane 212, and the limiting surface 213 can be directly formed, which is convenient for machining. Moreover, the formation of the inclined boss 210 increases the structural strength of the valve plate 200.

[0051] As Figure 4 shown, an inclined boss 210 protruding from the front side to the rear side is provided on the valve plate 200. The rear side of the inclined boss 210 is a continuous bent surface, and the continuous bent surface includes an inclined surface, a horizontal surface, and a vertical surface sequentially connected from the bottom end to the top end. The inclined surface forms the pressing inclined surface 211, the horizontal surface forms the abutting plane 212, and the vertical surface forms the limiting surface 213.

[0052] Compared with Figure 3The difference from the embodiments lies in that the abutting plane 212 and the limiting surface 213 are no longer formed on the inclined boss 210 through a counterbore, but a continuous bending surface is directly prepared. The continuous bending surface includes an inclined surface, a transverse surface, and a longitudinal surface that are sequentially connected from the bottom end to the top end. The inclined surface forms the pressing inclined surface 211, the transverse surface forms the abutting plane 212, and the longitudinal surface forms the limiting surface 213. The scheme of directly forming a continuous bending surface backward at one time is simpler to operate than the scheme of first preparing the inclined boss 210 backward and then preparing the counterbore forward, and it is not easy to crush the valve plate 200.

[0053] In order to enable the fire prevention rod 300 to slide smoothly on each surface, the abutting end 330 of the fire prevention rod 300 is a round head to reduce sliding friction.

[0054] As Figure 4 and Figure 5 As shown, the first rotating shaft can rotate relative to the valve body 100, and a one-way rotating assembly is correspondingly arranged on the first rotating shaft and the valve body 100, so that the valve plate 200 can only rotate in one direction to close the air outlet 110. Specifically, the one-way rotating assembly includes a ratchet wheel 510 arranged on the first rotating shaft and a ratchet pawl 520 arranged on the valve body 100. When the valve plate 200 rotates forward, the ratchet pawl 520 does not obstruct the ratchet wheel 510, realizing one-way rotation. On the contrary, when the valve plate 200 has a tendency to move backward, the ratchet pawl 520 obstructs the ratchet wheel 510, further improving the sealing performance of the valve plate 200.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire check valve, characterized in that: include: A valve body (100), a valve plate (200) and a fireproof rod (300), wherein the valve plate (200) is rotatably connected to the valve body (100) via a first rotating shaft and is used to open and close an air outlet (110) of the valve body (100), and the first rotating shaft extends along a first direction; the fireproof rod (300) is movably connected to the valve body (100), and the fireproof rod (300) can move along a second direction after being unlocked to push the valve plate (200) to close the air outlet (110); the first direction and the second direction are both perpendicular to the front-rear direction; The fireproof rod (300) is located at the rear side of the valve plate (200), and a pressing inclined surface (211) and an abutting plane (212) that are in sliding contact with the fireproof rod (300) are sequentially arranged on the rear side of the valve plate (200), and the end of the pressing inclined surface (211) is connected to the head end of the abutting plane (212), so that in the process of switching from the unlocking state to the stopping state, the fireproof rod (300) contacts the pressing inclined surface (211) and the abutting plane (212) in sequence; When the valve plate (200) is in a state of closing the air outlet (110), the fireproof rod (300) abuts against the abutment plane (212), and the front-to-back distance between the pressing slope (211) and the vertical plane where the fireproof rod (300) is located gradually decreases from the head end of the pressing slope (211) toward the tail end of the pressing slope (211); the abutment plane (212) is parallel to the vertical plane where the fireproof rod (300) is located.

2. The fire check valve according to claim 1, characterized in that: A limiting surface (213) is also provided on the valve plate (200), the end of the abutting plane (212) is connected to the limiting surface (213), and the limiting surface (213) is used to prevent the fire rod (300) from sliding out from the tail end of the abutting plane (212).

3. The fire-proof check valve according to claim 2, characterized in that: From front to back, the limiting surface (213) is inclined toward one side of the abutting plane (212), so that the angle between the abutting plane (212) and the limiting surface (213) is less than 90°, so as to prevent the fire rod (300) from contacting the turning radius formed at the transition between the abutting plane (212) and the limiting surface (213).

4. The fire-proof check valve according to claim 2, characterized in that: The limiting surface (213) is provided with a stopper (2131) protruding toward the side where the abutting plane (212) is located, and the stopper (2131) is in contact with the fireproof rod (300) to prevent the fireproof rod (300) from contacting the rounded corner formed at the transition between the abutting plane (212) and the limiting surface (213).

5. The fire-proof check valve according to claim 2, characterized in that: A protrusion (331) is provided on the side wall of the fire-proof rod (300), and the protrusion (331) is spaced apart from the abutting end (330) of the fire-proof rod (300). The protrusion (331) contacts the limiting surface (213) to prevent the fire-proof rod (300) from contacting the rounded corner formed at the transition between the abutting plane (212) and the limiting surface (213).

6. The fire check valve according to any one of claims 2 to 5, characterized in that: The valve plate (200) is provided with an inclined boss (210) protruding from the front side toward the rear side, the rear side of the inclined boss (210) is an inclined surface, and a sunken platform is provided on the inclined surface, which is sunken from the back to the front. The bottom surface of the sunken platform forms the abutment plane (212), and the side wall of the sunken platform close to the high end of the inclined surface forms the limiting surface (213). In the inclined surface, the part located from the bottom end of the inclined surface to the sunken platform forms the clamping inclined surface (211).

7. The fire-proof check valve according to any one of claims 2 to 5, characterized in that: The valve plate (200) is provided with an inclined boss (210) protruding from the front side toward the rear side, and the rear side of the inclined boss (210) is a continuous bending surface, and the continuous bending surface includes an inclined surface, a transverse surface and a longitudinal surface connected in sequence from the bottom end to the top end, the inclined surface forms the clamping inclined surface (211), the transverse surface forms the abutting plane (212), and the longitudinal surface forms the limiting surface (213).

8. The fire check valve according to any one of claims 1 to 5, characterized in that: The abutting end (330) of the fire-proof rod (300) is a round head.

9. The fire-proof check valve according to any one of claims 1 to 5, characterized in that: The first rotating shaft is capable of rotating relative to the valve body (100), and one-way rotating components are correspondingly provided on the first rotating shaft and the valve body (100), so that the valve plate (200) can only rotate in one direction to close the air outlet (110).

10. The fire check valve according to claim 9, characterized in that: The one-way rotation assembly comprises a ratchet (510) arranged on the first rotating shaft, and a ratchet pawl (520) arranged on the valve body (100).

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