Fire check valve

Abstract

The present invention relates to a fire check valve, which solves the problem of complex installation structure of a temperature sensing mechanism. The fire check valve comprises a valve body with an exhaust port, a valve plate and a connecting mechanism, wherein the connecting mechanism connects the valve plate with the valve body and is used to drive the valve plate to close the exhaust port, and the fire check valve also comprises a locking mechanism, a toggle mechanism, a first elastic element and a temperature sensing mechanism, wherein the locking mechanism and the toggle mechanism are arranged on the valve body, and the temperature sensing mechanism connects the locking mechanism and the toggle mechanism, and after the temperature sensing mechanism is actuated, the toggle mechanism drives the connecting mechanism to move relative to the valve body, so that the connecting mechanism closes the exhaust port through the valve plate.

Description

Technical Field

[0001] The invention relates to a fire-proof check valve. Background Art

[0002] The existing fireproof check valve (the specific structure can refer to the invention patent with application number 201610651149.5) includes a valve seat, a lever, a temperature sensing mechanism and a torsion spring. The temperature sensing mechanism includes a first metal plate, a second metal plate and a fusible solder for connecting the first metal plate and the second metal plate. The lever and the second metal plate are rotatably connected to the valve seat. One torsion arm of the torsion spring is connected to the valve seat. The other torsion arm of the torsion spring is connected to the lever and drives the lever to abut against the first metal plate. A limiter is provided on the valve seat. When the other torsion arm of the torsion spring is connected to the lever and drives the lever to abut against the first metal plate, and the first metal plate and the second metal plate are connected by the fusible solder, the second metal plate abuts against the limiter to achieve the temperature sensing mechanism being clamped between the lever and the limiter. However, the installation structure of the existing temperature sensing mechanism is complicated. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a fire-proof check valve to simplify the installation structure of a temperature sensing mechanism.

[0004] To solve the above problems, the present invention provides the following technical solutions: a fire check valve, comprising a valve body with an exhaust port, a valve plate and a connecting mechanism, the valve plate being made of metal, the connecting mechanism connecting the valve plate and the valve body and being used to drive the valve plate to close the exhaust port, the fire check valve also comprising a locking mechanism, a toggle mechanism, a first elastic element and a temperature sensing mechanism, the locking mechanism and the toggle mechanism being arranged on the valve body, the temperature sensing mechanism connecting the locking mechanism and the toggle mechanism, after the temperature sensing mechanism is actuated, the toggle mechanism drives the connecting mechanism to move relative to the valve body so that the connecting mechanism closes the exhaust port through the valve plate.

[0005] Furthermore, one end of the temperature sensing mechanism is detachably arranged on the locking mechanism and / or the other end of the temperature sensing mechanism is detachably arranged on the toggle mechanism.

[0006] Further, one end of the temperature sensing mechanism is arranged on the locking mechanism, and the other end of the temperature sensing mechanism is clamped with the toggle mechanism; or, one end of the temperature sensing mechanism is clamped with the locking mechanism, and the other end of the temperature sensing mechanism is arranged on the toggle mechanism; or, one end of the temperature sensing mechanism is clamped with the locking mechanism, and the other end of the temperature sensing mechanism is clamped with the toggle mechanism.

[0007] Furthermore, the temperature sensing mechanism includes a first metal plate, a second metal plate and a first solder for connecting the first metal plate and the second metal plate, the first metal plate is arranged on the locking mechanism, the second metal plate is provided with a stopper, and the stopper is engaged with the toggle mechanism; or, the temperature sensing mechanism includes a first solder for connecting the locking mechanism and the toggle mechanism.

[0008] Furthermore, the temperature sensing mechanism further includes a second solder material arranged on the locking mechanism, the second solder material is arranged on the outside of the valve body, and the first solder material is arranged on the inside of the valve body.

[0009] Furthermore, the locking mechanism includes a locking rod, the valve body includes an annular baffle, and the annular baffle is provided with a guide hole. After the locking rod passes through the guide hole, the second solder is arranged at one end of the locking rod, and the first metal plate is arranged at the other end of the locking rod.

[0010] Furthermore, the locking rod comprises a screw, the second solder is clamped between the screw head and the outer end wall of the annular baffle, and the rod portion of the screw is fixedly connected to the first metal plate.

[0011] Furthermore, the second solder is a solder ring sleeved on the screw shank.

[0012] Furthermore, the fireproof check valve also includes a fixing mechanism movably arranged on the valve body, and the wall of the exhaust duct can be clamped between the fixing mechanism and the valve body; the fixing mechanism includes a torsion spring, and the torsion spring is detachably arranged inside the valve body.

[0013] Furthermore, the fire check valve also includes a second elastic element, which is used to drive the connecting mechanism to rotate relative to the valve body to maintain the tendency of the connecting mechanism to close the exhaust port through the valve plate; the fire check valve also includes a flexible gasket arranged on the inner side of the valve body.

[0014] Beneficial effects of the present invention:

[0015] In the present invention, the fire check valve includes a locking mechanism and a temperature sensing mechanism, and the temperature sensing mechanism connects the locking mechanism and the fluctuation mechanism. In the prior art, the fire check valve needs to go through three steps to install the temperature sensing mechanism on the valve seat during the manufacturing process: step one, the temperature sensing mechanism is set on the valve seat through a fastener; step two, one side of the temperature sensing mechanism is against the limiter; step three, the other side of the temperature sensing mechanism is against the lever. In the present invention, the temperature sensing mechanism is first set on the locking mechanism, and then the temperature sensing mechanism is set on the toggle mechanism. Through the above two steps, the temperature sensing mechanism completes its installation steps. With such a design, by changing the installation position and installation structure of the temperature sensing mechanism, the installation steps of the fire check valve are simplified, the production efficiency of the fire check valve is improved, and the manufacturing cost of the fire check valve is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of a fire check valve in a preferred embodiment of the present invention;

[0017] Figure 2 is a bottom view of a fire check valve in a preferred embodiment of the present invention;

[0018] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0019] Figure 4 yes Figure 2 Cross-sectional view at the middle BB (locking mechanism in locked position);

[0020] Figure 5 yes Figure 2 Cross-sectional view at the middle BB (locking mechanism in unlocked position);

[0021] Figure 6 is a three-dimensional diagram of a locking mechanism and a temperature sensing mechanism in a preferred embodiment of the present invention;

[0022] Figure 7 is a cross-sectional view of a locking mechanism and a temperature sensing mechanism in a preferred embodiment of the present invention;

[0023] Figure 8 is a three-dimensional diagram of a valve body in a preferred embodiment of the present invention;

[0024] Figure 9 is a front view of the toggle mechanism in a preferred embodiment of the present invention;

[0025] Figure 10 is a three-dimensional diagram of a second valve seat in a preferred embodiment of the present invention;

[0026] Figure 11 It is a three-dimensional diagram of a part of the fire-proof check valve in the preferred embodiment of the present invention (the valve plate and the connecting mechanism are omitted);

[0027] Figure 12 It is a three-dimensional diagram of a part of the fire-proof check valve in the preferred embodiment of the present invention (the toggle mechanism is omitted);

[0028] Figure 13 It is a three-dimensional diagram of the connecting mechanism in the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0030] See also Figure 2 and Figure 3 The fireproof check valve comprises a valve body 1 having an exhaust port 111, a valve plate 2 and a connecting mechanism 3. The valve body 1, the valve plate 2 and the connecting mechanism 3 are made of metal or other high temperature resistant materials. The connecting mechanism 3 is used to connect the valve plate 2 with the valve body 1 and can drive the valve plate 2 to close the exhaust port 111.

[0031] from Figure 3 It can be seen that the valve body 1 of this embodiment has an exhaust channel 11, and an exhaust port 111 is arranged on the exhaust channel 11. When the valve plate 2 closes the exhaust port 111, the exhaust channel 11 located on both sides of the exhaust port 111 will not be able to realize the flow of smoke, which means that when the valve plate 2 closes the exhaust port 111, the smoke in the user's room cannot pass through the fire check valve to enter the exhaust channel, and the smoke in the exhaust channel cannot pass through the fire check valve to enter the user's room. Of course, in the prior art, the valve body may include an annular baffle with an exhaust port, and there is no exhaust channel on this valve body.

[0032] There are three ways for the connection mechanism 3 on the fire check valve to close the exhaust port 111 through the valve plate 2: 1. Figure 3 As shown, the fire check valve includes a second elastic element 8, which is one of a second torsion spring, a tension spring and a compression spring. The second elastic element 8 is used to drive the connecting mechanism 3 to drive the valve plate 1 to rotate relative to the valve body 1, so as to maintain the tendency of the connecting mechanism 3 to close the exhaust port 111 through the valve plate 1; 2. The valve plate maintains the tendency to close the exhaust port under the action of its own gravity; 3. The connecting mechanism is eccentrically arranged to maintain the tendency of the valve plate to close the exhaust port.

[0033] See also Figure 1 , Figure 4 and Figure 6, which is different from the prior art in that: in this embodiment, the fire check valve also includes a locking mechanism 4, a toggle mechanism 6, a first elastic element 7 and a temperature sensing mechanism 5. The locking mechanism 4 and the toggle mechanism 6 are arranged on the valve body 1, and the temperature sensing mechanism 5 connects the locking mechanism 4 and the toggle mechanism 6. After the temperature sensing mechanism 5 is actuated, the toggle mechanism 6 drives the connecting mechanism 3 to move relative to the valve body 1, so that the connecting mechanism 3 closes the exhaust port 111 through the valve plate 2.

[0034] In the present invention, one end of the temperature sensing mechanism 5 is detachably arranged on the locking mechanism 4 and / or the other end of the temperature sensing mechanism 5 is detachably arranged on the toggle mechanism 6, for example: one end of the temperature sensing mechanism 5 is arranged on the locking mechanism 4, and the other end of the temperature sensing mechanism 5 is engaged with the toggle mechanism 6; or, one end of the temperature sensing mechanism 5 is engaged with the locking mechanism 4, and the other end of the temperature sensing mechanism 5 is arranged on the toggle mechanism 6; or, one end of the temperature sensing mechanism 5 is engaged with the locking mechanism 4, and the other end of the temperature sensing mechanism 5 is engaged with the toggle mechanism 6. Such a design reduces the replacement cost of the temperature sensing mechanism 5.

[0035] Combination Figure 4 and Figure 6 It can be concluded that the temperature sensing mechanism 5 of this embodiment includes a first metal plate 521, a second metal plate 523 and a first solder 522 for connecting the first metal plate 521 and the second metal plate 523. The first metal plate 521 is arranged on the locking mechanism 4, and a rotation stop 5231 is arranged on the second metal plate 523. The rotation stop 5231 is engaged with the toggle mechanism 6. When the locking mechanism 4 is in the locking position, the rotation stop 5231 is engaged with the toggle mechanism 6 to prevent the first elastic element 7 from driving the toggle mechanism 6 to move relative to the valve body 1. In other embodiments of the present invention, the temperature sensing mechanism includes a first solder for connecting the locking mechanism and the toggle mechanism; or, the temperature sensing mechanism includes a first memory metal for connecting the locking mechanism and the toggle mechanism.

[0036] In this embodiment, the first metal plate 521, the second metal plate 523 and the first solder 522 are arranged on the inner side of the valve body 1, and the temperature sensing mechanism 5 further includes the second solder 51 arranged on the locking mechanism 4. In other embodiments of the invention, the first metal plate, part of the second metal plate and the first solder can be arranged on the outer side of the valve body. In this case, it is only necessary to open an avoidance hole for avoiding the second metal plate on the annular baffle of the valve body, so that the remaining part of the second metal plate is located on the inner side of the valve body.

[0037] The first metal plate 521, the second metal plate 523 and the first solder 522 form a temperature sensing unit 52. The temperature sensing unit 52 and the second solder 51 form a temperature sensing mechanism 5. The second solder 51 is arranged outside the valve body 1. When a fire occurs indoors, the second solder 51 melts, and the locking rod moves axially from the locked position to the unlocked position to close the exhaust port 111 by the valve plate 2. The temperature sensing unit 51 is arranged inside the valve body 1. When a fire occurs outdoors, the first solder 522 melts, and the first metal plate 521 is separated from the second metal plate 523 to close the exhaust port 111 by the valve plate 2.

[0038] In this embodiment, the first solder 52 and the second solder 51 may be one or more of solders such as bismuth-based, indium-based, tin-based, cadmium-based, zinc-based, and lead-based solders.

[0039] See Figure 6 and Figure 8 , the locking mechanism 4 includes a locking rod. The valve body 1 includes a first exhaust pipe 101, a second exhaust pipe 103, and an annular baffle 102 that can abut against the valve plate 2. The first exhaust pipe 101 is connected to the second exhaust pipe 103 through the annular baffle 102. The annular baffle 102 encloses the exhaust port 111. A guiding hole 12 is provided on the annular baffle 102. After the locking rod passes through the guiding hole 12, the second solder 51 is arranged at one end of the locking rod, and the first metal plate 521 is arranged at the other end of the locking rod. Of course, in other embodiments of the present invention, the locking rod can be welded inside the valve body.

[0040] In the prior art, when the temperature sensing mechanism is clamped between the lever and the limiting member, the lever exerts a first acting force on the first metal plate, and the limiting member exerts a second acting force on the second metal plate. The first acting force and the second acting force are equal in magnitude and opposite in direction. In other words, the first acting force maintains the tendency of the first metal plate to move upward relative to the fusible solder, and the second acting force maintains the tendency of the second metal plate to move downward relative to the fusible solder. Since the positions where the lever abuts against the first metal plate and the positions where the limiting member abuts against the second metal plate are staggered from each other, the fusible solder is long-term subjected to torsional force. The long-term action of the torsional force on the fusible solder will cause the first metal plate (or the second metal plate) to be separated from the fusible solder, which means that at normal temperature, the temperature sensing mechanism of the fire prevention check valve will automatically fail after being used for a period of time. After the temperature sensing mechanism automatically fails, the torsion spring drives the lever to rotate relative to the valve seat to close the exhaust port by the lever through the connecting rod.

[0041] From Figure 6 it can be seen that the locking rod includes a screw. The second solder 51 is clamped between the head 41 of the screw and the outer end wall of the annular baffle 102. The rod portion 42 of the screw is fixedly connected to the first metal plate 521. The second solder 51 can effectively improve the service life of the temperature sensing mechanism 5.

[0042] Such asFigure 4 As shown in FIG. 1 , when the screw is in the locked position, the second solder 51 is clamped between the screw head 41 and the outer end wall of the annular baffle 102. After the temperature sensing mechanism 5 is actuated, the first elastic element 7 drives the screw from the locked position to the unlocked position through the toggle mechanism 6. Figure 5 As shown, when the screw is located at the unlocking position, the valve plate 2 closes the exhaust port 111 .

[0043] The action of the temperature sensing mechanism 5 includes a melting action of the temperature sensing mechanism 5. In other embodiments of the present invention, the temperature sensing mechanism may include a second memory metal, which is clamped between the locking mechanism and the valve body. After the second memory metal undergoes a deformation action (the deformation action includes but is not limited to the bending of the second memory metal under pressure and the change of the thickness of the second memory metal under pressure), the first elastic element drives the locking mechanism to move from the locked position to the unlocked position through the toggle mechanism. When the locking mechanism is in the unlocked position, the valve plate closes the exhaust port.

[0044] See also Figure 7 The second brazing material 51 is a brazing material ring which is sleeved on the screw shank 42. The brazing material ring 51 has a mounting hole 511. When the screw shank 42 passes through the mounting hole 511, the brazing material ring 51 is clamped between the screw head 41 and the annular baffle 102. In other embodiments of the present invention, the locking mechanism includes a bolt and a nut. The bolt passes through the brazing material ring and the first metal plate and is fixedly connected with the nut.

[0045] Furthermore, in other embodiments of the present invention, the temperature sensing mechanism may include at least one solder plate, and the solder plate is clamped between the head of the screw and the annular baffle.

[0046] In this embodiment, the height of the anti-rotation portion 5231 is H1, and the axial length of the solder ring is H3, where H1<H3. With such a design, after the solder ring melts, the axial movement range of the locking mechanism 4 relative to the valve body 1 is greater than H1, which means that when the locking mechanism 4 moves from the locked position to the unlocked position, the anti-rotation portion 5231 will be separated from the toggle mechanism 6.

[0047] In this embodiment, a solder ring is clamped between the head 41 of the screw and the annular baffle 102, but in other embodiments of the present invention, the number of solder rings clamped between the fixing portion and the annular baffle can be adjusted according to actual needs.

[0048] In this embodiment, the first metal plate 521 can be detachably set on the other end of the locking rod by means of snap-on, screw-on, hinged, etc. Preferably, a fixing section 5211 is provided on the first metal plate 521, and a threaded hole matching the rod portion 42 of the screw is provided on the fixing section 5211. Therefore, the rod portion 42 of the screw passes through the threaded hole to realize the fixed connection between the rod portion 42 of the screw and the first metal plate 521.

[0049] See also Figure 3 and Figure 13 The connecting mechanism 3 includes a connecting rod 31, the lower end of the connecting rod 31 is rotatably connected to the valve body 1, and the upper end of the connecting rod 31 is movably connected to the valve plate 2. In addition, in other embodiments of the present invention, the lower end of the connecting rod can slide along the slide rail on the valve body to enable the valve plate to close the exhaust port, while the upper end of the connecting rod is rotatably connected to the valve plate.

[0050] In this embodiment, the fireproof check valve also includes a bolt 91 and a nut 92. The bolt 91 passes through the connecting rod 31 and the valve plate 2 in sequence and is fixedly connected with the nut 92. When the bolt 91 passes through the connecting rod 31 and the valve plate 2 in sequence and is fixedly connected with the nut 92, the interval gap between the bolt head and the nut 92 is greater than the sum of the thickness of the valve plate 2 and the thickness of the bottom plate 301 on the connecting rod 31.

[0051] Preferably, the bolt 91 is a stepped bolt, which includes a bolt head, a stepped portion and a screw section in sequence along its axial direction, and the valve plate 2 is sleeved on the stepped portion.

[0052] In this embodiment, the connection mechanism 3 further comprises a rotating shaft 10, and the connecting rod 31 is rotatably connected to the second valve seat 107 via the rotating shaft 10. In other embodiments of the present invention, one of the connecting rod and the second valve seat is provided with a rotating shaft, and the other is provided with an axial hole matched with the rotating shaft.

[0053] See also Figure 9 and Figure 11 The toggle mechanism 6 includes a toggle rod transversely arranged on the valve body 1, a transition portion is arranged at the edge of the toggle rod, and the middle position of the toggle rod protrudes outward. In other embodiments of the present invention, the toggle mechanism includes an arc plate, a rotating rod, and a fastener for connecting the arc plate and the rotating rod.

[0054] See also Figure 9 , the lever is provided with a receiving cavity for limiting the installation position of the temperature sensing element 5, specifically: a positioning groove 611 is provided on the outer wall of the lever, the positioning groove 611 is the receiving cavity, and when the anti-rotation portion 5231 is engaged with the lever, the second metal plate 523 is located in the positioning groove 611. Such a design effectively limits the position where the second metal plate 523 is engaged with the toggle mechanism 6. In other embodiments of the present invention, the lever is provided with a positioning hole, the positioning hole is the receiving cavity, and the second metal plate can be inserted into the positioning hole.

[0055] Preferably, the depth of the positioning groove 611 is H2, where H2>the thickness of the second metal plate 523.

[0056] from Figure 9 It can be seen that the middle position of the lever is provided with an arc segment 61 for connecting the adapter, and the outer side wall of the arc segment is arc-shaped. Such a design can prevent the lever from interfering with the valve body 1 during movement.

[0057] In this embodiment, the adapter includes a rotating shaft section 62 and a clamping section 63, and the first elastic element 7 is a first torsion spring, which is sleeved on the clamping section 63. Of course, in other embodiments of the present invention, the adapter may include only a rotating shaft section, and the first torsion spring is sleeved on the rotating shaft section; or, the adapter may include only a shaft hole section, and the first torsion spring is sleeved on the valve body.

[0058] See also Figure 12 and Figure 13 The connecting rod 31 includes a first side plate 302, a second side plate 303 and a bottom plate 301 for connecting the first side plate 302 and the second side plate 303. The first side plate 302, the bottom plate 301 and the second side plate 303 form a receiving cavity 311. The first side plate 302 is provided with a first inclined section 3021, and the second side plate 303 is provided with a second inclined section 3031. After the temperature sensing mechanism 5 is actuated, the toggle mechanism 6 slides forward along the first inclined section 3021 and / or the second inclined section 3031, so that the connecting rod 31 closes the exhaust port 111 through the valve plate 2. With such a design, the movement direction of the toggle mechanism 6 is limited.

[0059] In this embodiment, at least one protrusion for preventing the lever from sliding in the reverse direction thereof is provided on the first inclined section 3021 and / or the second inclined section 3031. Such a design effectively prevents the valve plate 2 from opening the exhaust port 111 under the action of the high-temperature airflow.

[0060] Preferably, the protrusion is an inverted tooth, and with such a design, the lever cannot slide in the reverse direction. In other embodiments of the present invention, the protrusion may be a boss.

[0061] See also Figure 3 and Figure 10 The valve body 1 is provided with a first valve seat 106 and a second valve seat 107, the first valve seat 106 is connected to the valve body 1 by a first fixing screw 20, and the second valve seat 107 is connected to the valve body 1 by a second fixing screw 30. In other embodiments of the present invention, the first valve seat is snap-connected to the valve body, and the second valve seat is connected to the valve body by welding.

[0062] In this embodiment, the fire check valve further comprises a fixing mechanism movably arranged on the valve body 1, and the wall of the exhaust duct can be clamped between the fixing mechanism and the valve body 1. Preferably, the fixing mechanism comprises a torsion spring, which is referred to as a third torsion spring in the present invention for the sake of distinction. The third torsion spring is detachably arranged on the inner side of the valve body 1 to achieve the wall of the exhaust duct being clamped between a torsion arm of the third torsion spring and the inner wall of the valve body 1. In other embodiments of the present invention, the fixing mechanism comprises an operating rod and a clamping block, and the operating rod adjusts the spacing distance between the clamping block and the valve body to achieve the wall of the exhaust duct being clamped between the side wall of the clamping block and the inner wall of the valve body.

[0063] Preferably, the fire prevention check valve further includes a flexible gasket disposed inside the valve body 1. When the wall of the exhaust passage is clamped between the fixing mechanism and the valve body 1, the flexible gasket is deformed by the extrusion of the valve body and the wall of the exhaust passage, so as to seal the gap between the valve body 1 and the wall of the exhaust passage.

[0064] The above is only the specific embodiment of the present invention, but the protection scope 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 content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A fire prevention check valve, comprising a valve body with an exhaust port, a valve disc and a connecting mechanism, the connecting mechanism connecting the valve disc and the valve body and being used to drive the valve disc to close the exhaust port, characterized in that, The fire-proof check valve further comprises a locking mechanism, a toggle mechanism, a first elastic element and a temperature sensing mechanism, wherein the locking mechanism and the toggle mechanism are arranged on the valve body, and the temperature sensing mechanism connects the locking mechanism and the toggle mechanism. After the temperature sensing mechanism is actuated, the toggle mechanism drives the connecting mechanism to move relative to the valve body, so that the connecting mechanism closes the exhaust port through the valve plate; The temperature sensing mechanism comprises a first metal plate, a second metal plate and a first solder for connecting the first metal plate and the second metal plate, the first metal plate is arranged on the locking mechanism, the second metal plate is provided with a rotation-stopping portion, and the rotation-stopping portion is engaged with the toggle mechanism; The temperature sensing mechanism further comprises a second solder material arranged on the locking mechanism, the second solder material is arranged on the outside of the valve body, and the first solder material is arranged on the inside of the valve body; The height of the anti-rotation portion is H1, the axial length of the solder ring is H3, and H1<H3.

2. The fire prevention check valve according to claim 1, characterized in that, One end of the temperature sensing mechanism is detachably arranged on the locking mechanism and / or the other end of the temperature sensing mechanism is detachably arranged on the toggle mechanism.

3. The fire prevention check valve according to claim 2, characterized in that, One end of the temperature sensing mechanism is arranged on the locking mechanism, and the other end of the temperature sensing mechanism is clamped with the toggle mechanism; or, one end of the temperature sensing mechanism is clamped with the locking mechanism, and the other end of the temperature sensing mechanism is arranged on the toggle mechanism; or, one end of the temperature sensing mechanism is clamped with the locking mechanism, and the other end of the temperature sensing mechanism is clamped with the toggle mechanism.

4. The fire prevention check valve according to claim 1, characterized in that, The locking mechanism includes a locking rod, the valve body includes an annular baffle, a guide hole is provided on the annular baffle, after the locking rod passes through the guide hole, the second solder is arranged at one end of the locking rod, and the first metal plate is arranged at the other end of the locking rod.

5. The fire prevention check valve according to claim 4, characterized in that, The locking rod comprises a screw, the second solder is clamped between the screw head and the outer end wall of the annular baffle, and the rod portion of the screw is fixedly connected to the first metal plate.

6. The fire prevention check valve according to claim 5, characterized in that, The second solder is a solder ring sleeved on the screw shank.

7. The fire prevention check valve according to claim 1, characterized in that, The fireproof check valve further comprises a fixing mechanism movably arranged on the valve body, and the wall of the exhaust passage can be clamped between the fixing mechanism and the valve body; the fixing mechanism comprises a torsion spring, and the torsion spring is detachably arranged inside the valve body.

8. The fire prevention check valve according to claim 1, characterized in that, The fireproof check valve also includes a second elastic element, which is used to drive the connecting mechanism to rotate relative to the valve body to maintain the tendency of the connecting mechanism to close the exhaust port through the valve plate; the fireproof check valve also includes a flexible gasket arranged inside the valve body.

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