Check valve and exhaust pipe

Abstract

The present application provides a check valve and a smoke exhaust pipe. The check valve provided in the present application includes: a valve body, which is a tubular cavity structure; a valve, which is arranged in the valve body, and the valve includes a valve disc, a drive rod and a support rod. The drive rod is arranged on one side surface of the valve disc, and the support rod is sleeved in the drive rod. The drive rod includes a first temperature sensing element, and the drive rod is used to drive the valve disc to rotate. After the first temperature sensing element is melted, the valve disc is out of the control of the drive rod. The support rod is used to support the valve disc when the first temperature sensing element is melted; the limiting component includes a limiting element, an elastic element and a second temperature sensing element, wherein the limiting element is connected to the inner side wall of the valve body through the elastic element, and the end of the limiting element away from the elastic element is connected to the inner side wall of the valve body through the second temperature sensing element, and the valve disc is located within the limiting stroke of the limiting element. The present application ensures that the check valve can remain closed during a fire to prevent the circulation of air from exacerbating the fire.

Description

Technical Field

[0001] The present application relates to the technical field of engineering components, and in particular to a check valve and a smoke exhaust pipe. Background Art

[0002] In many industrial and daily life scenarios, smoke is generated that needs to be exhausted promptly. For example, cooking fumes are produced. Therefore, in the kitchen, the range hood can be said to be an indispensable appliance. It can remove the fumes produced by the stove during cooking and block the generated fumes outside the kitchen through a check valve.

[0003] Range hoods are typically connected to a public flue via a check valve, exhausting the resulting fumes into the duct to remove them. However, there is a risk of fire during cooking. If the check valve is open, the airflow in the duct could exacerbate the fire. Therefore, how to close the check valve in the event of a fire is a pressing issue. Summary of the Invention

[0004] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a check valve, a smoke exhaust pipe and a range hood system.

[0005] In the first aspect, an embodiment of the present application provides a check valve, which includes: a valve body, which is a tubular cavity structure; a valve arranged in the valve body, the valve including a valve disc, a driving rod and a support rod, the driving rod is arranged on one side surface of the valve disc, and the support rod is sleeved in the driving rod, the driving rod includes a first temperature sensing element, the first temperature sensing element melts when the working environment temperature of the check valve reaches a preset temperature, the driving rod is used to drive the valve disc to rotate, after the first temperature sensing element melts, the valve disc is separated from the control of the driving rod, and the support rod is used to support the valve disc when the first temperature sensing element melts; a limiting component, the limiting component includes a limiting element, an elastic element and a second temperature sensing element, wherein the limiting element is connected to the inner side wall of the valve body through the elastic element, the end of the limiting element away from the elastic element is connected to the inner side wall of the valve body through the second temperature sensing element, and the valve disc is located within the limiting stroke of the limiting element.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the drive rod also includes a first drive rod portion and a second drive rod portion, the first drive rod portion, the first temperature sensing element and the second drive rod portion are connected in sequence, the second drive rod portion is used to drive the valve plate to rotate, and the first drive rod portion is used to separate the valve plate from the drive of the second drive rod portion after the first temperature sensing element melts.

[0007] In combination with the first aspect, in certain implementations of the first aspect, a first connecting portion is provided on a side of the first driving rod portion close to the second driving rod portion, and a second connecting portion is provided on a side of the second driving rod portion close to the first driving rod portion, the first connecting portion and the second connecting portion are connected to each other, and the support rod is arranged in the first connecting portion and the second connecting portion.

[0008] In combination with the first aspect, in some implementations of the first aspect, the support rod is a cylindrical structure, so that after the first temperature sensing element melts, the support rod cooperates with the first driving rod to release the valve plate from the control of the driving rod.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the length of the support rod is at least greater than the sum of the length of the shorter of the first connecting portion and the second connecting portion and the distance between the first driving rod portion and the second driving rod portion, so as to support the valve plate when the first temperature sensing element melts.

[0010] In combination with the first aspect, in certain implementations of the first aspect, a bearing opening is formed on the inner side wall of the valve body, and the bearing opening is used to bear an end of the first driving rod away from the first temperature sensing element.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the first driving rod is fixedly connected to a side surface of the valve plate, and the second driving rod is separated from the first driving rod after the first temperature sensing element melts.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the check valve also includes a driver arranged on the outer side wall of the valve body, and the end of the second drive rod away from the first temperature sensing element passes through the valve body and is connected to the driver, and the driver is used to drive the second drive rod to rotate, so that the second drive rod drives the first drive rod to rotate through the first temperature sensing element, thereby driving the valve plate to rotate through the first drive rod.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the limiting component includes a limiting element, an elastic element and a second temperature sensing element, wherein the limiting element is connected to the inner side wall of the valve body through the elastic element, the end of the limiting element away from the elastic element is connected to the inner side wall of the valve body through the second temperature sensing element, and the valve plate is located within the limiting stroke of the limiting element.

[0014] In combination with the first aspect, in certain implementations of the first aspect, a limiting stroke of the limiting element is greater than a straight-line distance from an end of the limiting element close to the elastic element to the driving rod.

[0015] In a second aspect, an embodiment of the present application provides a smoke exhaust pipe, which includes: a ventilation pipe; and the check valve of the first aspect, wherein the ventilation pipe is connected to the check valve.

[0016] The check valve provided in the embodiment of the present application, when the working temperature of the check valve reaches a preset temperature, the first temperature sensing element is melted, so that the valve plate is separated from the control of the driving rod, and the valve plate is supported by the support rod, and the valve plate is closed by the limiting component. This ensures that the check valve can remain closed during a fire to prevent the circulation of air from exacerbating the fire. When the working temperature of the check valve does not reach the preset temperature, the check valve can be connected to the smoke exhaust, exhaust, etc. pipes through the valve body, so that smoke, gas, etc. are discharged from one end of the check valve to the other end. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features, and advantages of the present application will become more apparent through a more detailed description of the embodiments of the present application in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 Shown is a schematic diagram of the exploded structure of a check valve provided by an exemplary embodiment of the present application.

[0019] Figure 2a Shown is a schematic structural diagram of one side of a valve provided by an exemplary embodiment of the present application.

[0020] Figure 2b Shown is a schematic structural diagram of the other side of a valve provided by an exemplary embodiment of the present application.

[0021] Figure 2c Shown is a schematic structural diagram of a driving rod 22 provided by an exemplary embodiment of the present application.

[0022] Figure 3a Shown is a schematic structural diagram of a check valve provided by an exemplary embodiment of the present application.

[0023] Figure 3b Shown is a schematic diagram of the AA cross-sectional structure of a check valve provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] The embodiments of the present application can be applied in the kitchen.

[0026] With the development of technology, the types of kitchen appliances are increasing. During the cooking process, oil smoke is inevitable, so the range hood is also an indispensable kitchen appliance. The range hood is usually connected to the public flue through a check valve, exhausting the generated oil smoke into the public flue to achieve the effect of removing oil smoke.

[0027] There is a possibility of fire during the cooking process. If the check valve is open when a fire occurs, the airflow in the public flue will aggravate the fire. Therefore, how to close the check valve in the event of a fire is an urgent problem that needs to be solved.

[0028] In order to solve the problem of closing the check valve in the event of a fire, the inventor conducted a series of studies and proposed a check valve in the embodiment of the present application, including a valve body, which has a tubular cavity structure; a valve arranged in the valve body, the valve including a valve disc, a driving rod and a support rod, the driving rod being arranged on one side surface of the valve disc, the support rod being sleeved in the driving rod, the driving rod including a first temperature sensing element, the first temperature sensing element melting when the working environment temperature of the check valve reaches a preset temperature, the driving rod being used to drive the valve disc to rotate, after the first temperature sensing element melting, the valve disc is separated from the control of the driving rod, the support rod being used to support the valve disc when the first temperature sensing element melting; a limiting component, the limiting component including a limiting element, an elastic element and a second temperature sensing element, wherein the limiting element is connected to the inner side wall of the valve body through the elastic element, the end of the limiting element away from the elastic element is connected to the inner side wall of the valve body through the second temperature sensing element, and the valve disc is located within the limiting stroke of the limiting element. When the working temperature of the check valve reaches a preset temperature, the first temperature sensing element is melted, so that the valve disc is separated from the control of the driving rod, and the valve disc is supported by the support rod, and the valve disc is closed by the limit component, thereby ensuring that the check valve can remain closed during a fire to prevent the circulation of air from exacerbating the fire. When the working temperature of the check valve does not reach the preset temperature, the check valve can be connected to the smoke exhaust, exhaust and other pipes through the valve body, so that smoke, gas, etc. are discharged from one end of the check valve to the other end.

[0029] Figure 1 The figure shows a schematic diagram of the exploded structure of a check valve provided by an exemplary embodiment of the present application. Figure 1 As shown, the check valve provided in the embodiment of the present application may include a valve body 10 , a valve 20 and a limiting component 30 .

[0030] The valve body 10 has a tubular hollow structure.

[0031] For example, the valve body 10 can be connected to a pipe for exhausting smoke, gas, etc., such as an air conditioning exhaust pipe, a public flue, etc., so as to discharge smoke, gas, etc.

[0032] The valve 20 is disposed within the tubular cavity of the valve body 10 and may include a valve disc 21, a drive rod 22, and a support rod 23. The valve disc 21 is a circular plate-like structure. The drive rod 22 is disposed on the diameter of one side surface of the valve disc 21. The support rod 23 is sleeved within the drive rod 22. The drive rod 22 includes a first temperature sensing element 221, which melts when the operating temperature of the check valve reaches a preset temperature. The drive rod 22 is used to drive the valve disc 21 to rotate. After the first temperature sensing element 221 melts, the valve disc 21 is free from the control of the drive rod 22. The support rod 23 is used to support the valve disc 21 when the first temperature sensing element 221 melts.

[0033] For example, the first temperature sensing element 221 may be an element such as a temperature-sensitive resistor wire that will fuse when the operating temperature reaches a preset temperature, which is not limited here.

[0034] Exemplarily, the valve plate 21 can rotate within an angle range of 0 to 180 degrees.

[0035] For example, valve 20 can be linked to a range hood, air conditioner, or other system. For a range hood, for example, the hood's controller uses feedback from the microcontroller to control the opening and closing of valve 20. Specifically, the microcontroller determines whether to open or close valve 20 based on power levels. When power levels are too low, such as when only the range hood's light is on, the controller will not control the actuator, preventing valve 20 from opening. When power levels meet the opening conditions for valve 20, the controller will control the actuator to open and close valve 20 based on actual conditions.

[0036] In the scenario where the check valve is used for cooking in the kitchen, when the working environment of the check valve reaches a preset temperature, it can be considered that the kitchen is at risk of fire or has encountered a fire. At this time, the first temperature sensing element 221 will melt, causing the valve disc 21 to break away from the control of the drive rod 22, preventing the valve disc 21 from remaining in an open state under the drive of the drive rod 22, causing air flow to cause a fire or aggravate the fire. After the valve disc 21 breaks away from the control of the drive rod 22, the support rod 23 will support the valve disc 21 to prevent the valve disc 21 from collapsing and causing the valve 20 to be unable to close. When the working environment of the check valve does not reach the preset temperature, the drive rod 22 will normally drive the valve disc 21 to rotate, so as to connect to the smoke exhaust, exhaust, etc. pipes through the valve body 10, so that smoke and gas are discharged from one end of the check valve to the other end.

[0037] The limiting component 30 may include a limiting element 31, an elastic element 32 and a second temperature sensing element 33, wherein the limiting element 31 is connected to the inner side wall of the valve body 10 through the elastic element 32, and the end of the limiting element 31 away from the elastic element 32 is connected to the inner side wall of the valve body 10 through the second temperature sensing element 33, and the valve plate 21 is located within the limiting stroke of the limiting element 31.

[0038] Illustratively, the limiting stroke of the limiting element 31 is greater than the straight-line distance from the end of the limiting element 31 close to the elastic element 32 to the driving rod 22, so that when the check valve is in the open state, the limiting element 31 can press against the valve 20 after the second temperature sensing element 33 melts, so that the check valve is closed.

[0039] For example, the limiting element 31 may be L-shaped and made of a high-temperature resistant material. For example, the elastic element 32 may be a torsion spring or other elastic device or structure, which is not limited here. Before the second temperature sensing element 33 is melted, the elastic element 32 is in a compressed state.

[0040] For example, since a fire will have a certain impact force, the check valve may remain in an open state after the valve plate 21 is separated from the control of the drive rod 22. When a fire occurs, the second temperature sensing element 33 is melted, releasing the compressed elastic element 32, causing the limiting element 31 to rotate to tighten the valve plate 21, thereby closing the check valve and preventing the fire from worsening.

[0041] It should be noted that since the check valve is composed of multiple independent components, each component can be appropriately replaced with a component with a size that is more suitable for the installation scenario according to the actual installation scenario, as long as the replaced independent components can be plugged into each other to form a check valve.

[0042] In the embodiment of the present application, when the working temperature of the check valve reaches a preset temperature, the first temperature sensing element 221 will melt, causing the valve disc 21 to be out of the control of the drive rod 22, and the support rod 23 will support the valve disc 21 that is out of the control of the drive rod 22, thereby preventing the valve disc 21 from collapsing. Similarly, when the working temperature of the check valve reaches a preset temperature, the second temperature sensing element 33 will also melt. After the second temperature sensing element 33 melts, the compressed elastic element 32 will be released, causing the limiting element 31 to rotate to fasten the valve disc 21, ensuring that the check valve can remain closed during a fire, preventing the circulation of air from exacerbating the fire, and when the working temperature of the check valve does not reach the preset temperature, the check valve can be connected to smoke exhaust, exhaust, etc. pipes through the valve body 10, so that smoke, gas, etc. are discharged from one end of the check valve to the other end.

[0043] Figure 2a Shown is a schematic structural diagram of one side of a valve provided by an exemplary embodiment of the present application. Figure 2b The figure shows the other side of the valve structure provided by an exemplary embodiment of the present application. Figure 2a and Figure 2bAs shown, a valve 20 provided by an exemplary embodiment of the present application includes a valve disc 21, a drive rod 22, and a support rod 23. The drive rod 22 also includes a first drive rod portion 222 and a second drive rod portion 223. The first drive rod portion 222, the first temperature sensing element 221, and the second drive rod portion 223 are sequentially connected.

[0044] For example, the valve disc 21 is a circular plate-shaped structure, the first driving rod 222 and the second driving rod 223 are both rectangular parallelepiped structures, the end of the first driving rod 222 close to the inner side wall of the valve body 10 is a cylindrical structure, the support rod 23 is a cylindrical structure, the first driving rod 222 is fixedly connected to the diameter of one side surface of the valve disc 21, the first driving rod 222 is provided with a first connecting portion 224 on the side close to the second driving rod 223, the second driving rod 223 is provided with a second connecting portion 225 on the side close to the first driving rod 222, and the first connecting portion 224 is provided with a second connecting portion 225. The support rod 23 is interconnected with the second communication portion 225. The support rod 23 is disposed within the first communication portion 224 and the second communication portion 225. The length of the support rod 23 is at least greater than the sum of the length of the shorter of the first and second communication portions 224, 225 and the distance between the first drive rod 222 and the second drive rod 223. This ensures that the valve disc 21 can be supported by the support rod 23 after the first temperature sensing element 221 has melted. Furthermore, after the first temperature sensing element 221 has melted, the support rod 23 can cooperate with the first drive rod 222 to release the valve disc 21 from the control of the drive rod 22. The second drive rod 223 is used to drive the valve disc 21 to rotate. After the first temperature sensing element 221 has melted, the first drive rod 222 separates from the second drive rod 223, cooperating with the support rod to release the valve disc 21 from the drive of the second drive rod 223.

[0045] For example, the first communication portion 224 may pass through the first driving rod portion 222 , and the second communication portion 225 may pass through the second driving rod portion 223 , which is not limited herein.

[0046] For example, a sealing rubber 211 may be fixed to the edge of the valve plate 21 to improve the sealing performance of the check valve.

[0047] In actual application, after the first temperature sensing element 221 melts, even if the second driving rod 223 is still rotating, since the support rod 23 is a cylindrical structure and one end of the support rod 23 is fixedly connected to the first driving rod 222 on one side of the valve disc 21, then under the action of the gravity of the valve disc 21, the second driving rod 223 will not drive the support rod 23 to rotate during the rotation of the second driving rod 223. Therefore, when the support rod 23 does not rotate, the first driving rod 222 fixedly connected to one side of the valve disc 21 will not rotate either, thereby causing the valve disc 21 to be separated from the control of the driving rod 22 and supporting the valve disc 21 through the support rod 23.

[0048] In another practical application, since the length of the support rod 23 is at least greater than the sum of the length of the shorter connecting portion of the first connecting portion 224 and the second connecting portion 225 and the distance between the first driving rod portion 222 and the second driving rod portion 223, after the first temperature sensing element 221 melts, the support rod 23 will definitely not separate from the first connecting portion 224 and the second connecting portion 225. Since the second driving rod portion 223 has not lost its support, the support rod 23 will definitely cooperate with the second driving rod portion 223 to support the valve plate 21 fixedly connected to the first driving rod portion 222.

[0049] As an implementation method, the driving rod 22 may also only include the first temperature sensing element 221 and the first driving rod portion 222. For ease of understanding, Figure 2c The figure shows a schematic diagram of the structure of the driving rod provided by an exemplary embodiment of the present application. Among them, the first driving rod portion 222 is fixedly connected to the first temperature sensing element 221. The first driving rod portion 222 is fixedly connected to the diameter of one side surface of the valve disc 21. The first driving rod portion 222 is provided with a first connecting portion 224 at one end close to the first temperature sensing element 221. A support opening 12 (not shown in the figure) is provided through the side wall of the valve body 10. One end of the support rod 23 is provided in the first connecting portion 224, and the other end is provided in the support opening 12 (not shown in the figure) to ensure that the support rod 23 can support the valve disc 21 after the first temperature sensing element 221 is melted.

[0050] In the embodiment of the present application, the first temperature sensing element 221 is melted when the working temperature of the check valve reaches a preset temperature, so that the valve plate 21 is separated from the control of the driving rod 22, and the valve plate 21 is supported by the support rod 23, thereby avoiding the check valve from being unable to close due to the collapse of the valve 20, thereby aggravating the fire.

[0051] Figure 3a Shown is a schematic structural diagram of a check valve provided by an exemplary embodiment of the present application. Figure 3b Shown is a schematic diagram of the AA cross-sectional structure of a check valve provided by an exemplary embodiment of the present application.

[0052] like Figure 3a and 3b As shown, the check valve provided by an exemplary embodiment of the present application also includes a driver 40 arranged on the outer side wall of the valve body 10, and the end of the second driving rod 223 away from the first temperature sensing element 221 passes through the support port 12 and is connected to the driver 40. The driver 40 is used to drive the second driving rod 223 to rotate, so that the second driving rod 223 drives the first driving rod 222 to rotate through the first temperature sensing element 221, thereby driving the valve plate 21 to rotate through the first driving rod 222.

[0053] Exemplarily, the inner side wall of the valve body 10 is provided with a bearing opening 11 at a position where the end of the first driving rod 222 away from the first temperature sensing element 221 is oriented when the check valve is in a closed state. The bearing opening 11 is used to support the end of the first driving rod 222 away from the first temperature sensing element 221, that is, the end of the first driving rod 222 that has a cylindrical structure.

[0054] Exemplarily, the driver 40 may be a motor, a structure or a device with driving capability, etc., which is not limited here.

[0055] As an implementation method, when the structure of the driving rod 22 is the structure shown in Figure b, the first temperature sensing element 221 is connected to the driver 40 through the support port 12, and one end of the support rod 23 is arranged in the first connecting portion 224, and the other end is arranged in the support port 12, so that when the first temperature sensing element 221 melts, the support rod 23 can support the valve plate 21 to prevent the valve plate 21 from collapsing.

[0056] In actual application, when encountering a fire, due to the problem of motor torque, the check valve cannot be closed in the event of a fire. At this time, the first temperature sensing element 221 is melted to make the first driving rod 222 out of the control of the motor, and the check valve is kept closed under the action of the limiting component 30 to avoid the fire from worsening.

[0057] In the embodiment of the present application, the driver 40 can be used to drive the second driving rod 223 to rotate, so that the second driving rod 223 drives the first driving rod 222 to rotate through the first temperature sensing element 221, thereby driving the valve plate 21 to rotate through the first driving rod 222 to realize the opening and closing of the check valve.

[0058] In one embodiment of the present application, a smoke exhaust pipe is further provided, which includes a ventilation pipe and a check valve as mentioned in any of the above embodiments and connected to the ventilation pipe.

[0059] In one embodiment of the present application, a range hood system is further provided. The range hood system includes a range hood and the exhaust pipe mentioned in the above embodiment. Specifically, the range hood includes an exhaust port, and the exhaust port of the range hood is connected to the exhaust pipe.

[0060] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0061] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0062] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A check valve, characterized in that: include: A valve body, wherein the valve body is a tubular hollow structure; a valve disposed in the valve body, the valve comprising a valve disc, a drive rod, and a support rod, the drive rod being disposed on a side surface of the valve disc, the support rod being sleeved within the drive rod, the drive rod comprising a first temperature sensing element, the first temperature sensing element being melted when the working environment temperature of the check valve reaches a preset temperature, the drive rod being used to drive the valve disc to rotate, the valve disc being free from the control of the drive rod after the first temperature sensing element is melted, and the support rod being used to support the valve disc when the first temperature sensing element is melted; a limiting component, the limiting component comprising a limiting element, an elastic element, and a second temperature sensing element, wherein the limiting element is connected to the inner side wall of the valve body through the elastic element, and an end of the limiting element away from the elastic element is connected to the inner side wall of the valve body through the second temperature sensing element, and the valve disc is located within the limiting stroke of the limiting element. Before the second temperature sensing element melts, the elastic element is in a compressed state, and the limiting element has an L-shaped structure; The driving rod also includes a first driving rod portion and a second driving rod portion. The first driving rod portion, the first temperature sensing element and the second driving rod portion are connected in sequence. The second driving rod portion is used to drive the valve plate to rotate. The first driving rod portion is used to separate the valve plate from the drive of the second driving rod portion after the first temperature sensing element melts.

2. The check valve according to claim 1, characterized in that A first connecting portion is provided on a side of the first driving rod portion close to the second driving rod portion, and a second connecting portion is provided on a side of the second driving rod portion close to the first driving rod portion. The first connecting portion and the second connecting portion are connected to each other, and the support rod is arranged in the first connecting portion and the second connecting portion.

3. The check valve according to claim 2, characterized in that: The support rod is in a cylindrical structure, so that after the first temperature sensing element is melted, the support rod cooperates with the first driving rod to release the valve plate from the control of the driving rod.

4. The check valve according to claim 2, characterized in that The length of the support rod is at least greater than the sum of the length of the shorter of the first and second communication parts and the distance between the first driving rod and the second driving rod, so as to support the valve plate when the first temperature sensing element is melted.

5. The check valve according to claim 1, wherein: A bearing opening is formed on the inner side wall of the valve body, and the bearing opening is used to bear an end of the first driving rod away from the first temperature sensing element.

6. The check valve according to any one of claims 1 to 5, characterized in that: The first driving rod is fixedly connected to a side surface of the valve plate, and the second driving rod is separated from the first driving rod after the first temperature sensing element is melted.

7. The check valve according to claim 6, characterized in that The check valve also includes a driver arranged on the outer side wall of the valve body, and the end of the second driving rod away from the first temperature sensing element passes through the valve body and is connected to the driver. The driver is used to drive the second driving rod to rotate, so that the second driving rod drives the first driving rod to rotate through the first temperature sensing element, thereby driving the valve plate to rotate through the first driving rod.

8. The check valve according to claim 1, wherein: The limiting stroke of the limiting element is greater than the straight-line distance from one end of the limiting element close to the elastic element to the driving rod.

9. A smoke exhaust pipe, characterized in that: include: ventilation ducts; The check valve according to any one of claims 1 to 8, wherein the ventilation pipe is connected to the check valve.

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