A valve

Abstract

The present invention provides a check valve, comprising a valve disc, a valve body, a connecting rod, a base, a first resilient component, a second resilient component, a first shaft pin, a second shaft pin, and a fuse component, wherein the first shaft pin and the second shaft pin are mounted on the base, the base is mounted on the valve body, one end of the connecting rod is movably connected to the first shaft pin on the base, and the other end is connected to the valve disc, the first resilient component provides a resilient force for the connecting rod to drive the connecting rod to rotate relative to the base, the second resilient component is mounted on the second shaft pin, the first arm of the second resilient component is constrained by the fuse component, when the ambient temperature is higher than the fusing temperature of the fuse component, the fuse component fuses and releases the constraint on the first arm of the second resilient component, the first arm rebounds and drives the connecting rod to close the valve disc and the valve body. The product has a simple structure and excellent performance.

Description

Technical Field

[0001] The invention relates to a check valve, in particular to a fireproof check valve for a flue. Background Art

[0002] In modern building environments, kitchen fumes are generally discharged into collective flues through range hoods. Since multiple residents of the same building use the same collective flue, there is a risk of smoke flowing back into the kitchen from the collective flue. There is also a risk that when a fire occurs, the flames will spread from the fire site through the collective flue and the exhaust holes of the kitchen hood to other residents' rooms. Therefore, it is essential to install a fire check valve at the entrance of the collective flue.

[0003] During the use of traditional valves that simply control the opening and closing of the valve plate through a spring, it is difficult to meet high requirements in terms of ventilation volume, rebound reliability, and sealing. In actual use, there is also the problem that the rebound force of the locking spring becomes smaller in a high-temperature environment, which in turn causes the valve to leak air at high temperatures. Therefore, it is an urgent need of the market to provide a check valve with a newer structure and better performance. Summary of the invention

[0004] In order to overcome one or more technical defects in the prior art, the present invention provides a check valve with a new structure, which is as follows:

[0005] A check valve comprises a valve disc, a valve body, a connecting rod, a base, a first rebound component, a second rebound component, a first axial pin, a second axial pin, and a fuse component. The first axial pin and the second axial pin are installed on the base, and the base is installed on the valve body. One end of the connecting rod is movably connected to the first axial pin on the base, and the other end is connected to the valve disc. The first rebound component provides a rebound force for the connecting rod to drive the connecting rod to rotate relative to the base. The second rebound component is installed on the second axial pin. The first arm of the second rebound component is constrained by the fuse component. When the ambient temperature is higher than the fusing temperature of the fuse component, the fuse component melts and releases the constraint on the first arm of the second rebound component. The first arm rebounds and drives the connecting rod to close the valve disc and the valve body.

[0006] In one embodiment, the fuse component is mounted on the base; in another embodiment, the fuse component is mounted on the valve body.

[0007] In one embodiment, the first resilient component is mounted on the first shaft pin to provide a resilient force for the connecting rod; in another embodiment, the first resilient component is mounted on the second shaft pin to provide a resilient force for the connecting rod.

[0008] In one embodiment, there is a holding portion on the connecting rod, and there is a bending portion on the first arm of the second resilient component. When the fuse component is blown, the bending portion presses on the connecting rod to drive the connecting rod to rotate and close the valve. After the valve is closed, the bending portion on the first arm hooks the holding portion to keep the valve closed. With this structure, the connecting rod is connected to the first axle pin, and the second resilient component is installed on the second axle pin. When the valve is closed, the contact points of the first axle pin, the second axle pin, the bending portion and the holding portion form a triangular locking structure from the side, so that even if the rebound force of the second resilient component decreases significantly, the triangular structure itself can prevent the valve from opening to a certain extent. It ensures that the valve can be closed even when the rebound force of the resilient component decreases in a high temperature environment, so as to achieve the fire prevention function.

[0009] In one embodiment, the holding portion on the connecting rod is a protrusion structure or a groove structure located on the connecting rod. In another embodiment, the holding portion on the connecting rod (3) is a connecting rod transverse axis (3-1) fixed on the connecting rod (3); in a preferred solution, the connecting rod transverse axis passes through the connecting rod (3) and is substantially perpendicular to the motion surface swept by the connecting rod (3). The shape of the connecting rod transverse axis can be circular, triangular, square, polygonal, etc.

[0010] In a preferred embodiment, the check valve further comprises a pressing plate, on which there is a clamping portion, a connecting rod transverse axis (3-1) is mounted on the connecting rod (3), a first resilient component provides a resilient force for the connecting rod (3), a first arm of the second resilient component is constrained by a fuse component, when the fuse component is blown, the fuse component releases the constraint on the first arm of the second resilient component, the first arm of the second resilient component drives the pressing plate, the pressing plate rotates and presses on the connecting rod transverse axis of the connecting rod (3), and the connecting rod (3) is driven to rotate by the connecting rod transverse axis, thereby closing the check valve. When the check valve is closed, the connecting rod transverse axis is at the clamping portion of the pressing plate. With this structure, when the check valve is closed, since the first shaft pin, the second shaft pin, and the connecting rod transverse axis form a triangular structure, even if the elastic force of the second resilient component is reduced at high temperature, the triangular structure can be used to keep the valve closed, thereby ensuring that the valve can be kept closed under high temperature conditions.

[0011] The clamping portion on the pressing sheet is a concave structure on the pressing sheet.

[0012] In a further preferred solution, a pressing piece driving pin is installed on the pressing piece, the first arm of the second resilient component is pressed on the pressing piece driving pin, and the fuse component constrains the first arm of the second resilient component by constraining the driving pin. When the fuse component is blown, the first arm of the second resilient component drives the pressing piece to rotate through the pressing piece driving pin, and the pressing piece rotates and presses on the connecting rod transverse axis on the connecting rod (3), and the connecting rod (3) is driven to rotate through the connecting rod transverse axis to close the valve. When the valve is closed, the connecting rod transverse axis is just located on the clamping portion on the pressing piece.

[0013] In a further preferred embodiment, the first arm of the first resilient component is directly pressed on the connecting rod (3) to provide a resilient force for the connecting rod (3). In another preferred embodiment, the first arm of the first resilient component is pressed on the connecting rod transverse axis on the connecting rod (3) to provide a resilient force to the connecting rod (3) via the connecting rod transverse axis.

[0014] In a preferred embodiment, a positioning component is further included, and the positioning component can locate the position of the connecting rod.

[0015] In one embodiment, the positioning component is movably mounted on the first axle pin, and the position of the connecting rod on the first axle pin can be adjusted by adjusting the position of the positioning component. In a further preferred embodiment, the first axle pin is a screw, the positioning component is a nut, and the position of the connecting rod can be adjusted by rotating the nut.

[0016] In another embodiment, the positioning component is fixedly mounted on the first axle pin. In a preferred embodiment, the positioning component is a positioning plate with a through hole, and the positioning plate is adjacent to the connecting rod. The positioning plate can be directly fixedly mounted on the first axle pin, or it can be fixed together by a slot located on the base and the first axle pin passing through the through hole on the positioning plate, so that it is fixed in a preset position. Since the positioning plate is adjacent to the connecting rod, the positioning plate can provide constraints for the movement of the connecting rod when the connecting rod moves, thereby improving the stability of the movement trajectory of the connecting rod.

[0017] In a preferred embodiment, the valve body (2) has one or more guiding structures extending outwards. The outward extension mentioned here refers to the extension in the direction of air outlet.

[0018] By providing a guide structure extending outward, the valve plate and the valve body (2) can be guided to close, so that the product has better rebound reliability and sealing performance. At the same time, the guide structure extending outward is conducive to the discharge of gas through the vent, and has less resistance than the inward extension method. On the basis of ensuring the closure of the valve body (2) and the valve plate, the air outlet resistance is reduced as much as possible.

[0019] The valve plate is opened and closed by the movement of the connecting rod (3) relative to the base. During use in a flue environment, the gas discharged from the flue exerts pressure on the valve plate to drive the valve plate to separate from the valve body (2) and open the valve. When the pressure of the discharged gas is sufficiently small or zero, the rebound force provided by the first rebound structure to the connecting rod (3) drives the valve plate and the valve body (2) to close.

[0020] The guide structure is located at the edge of the vent of the valve body (2). When the valve plate and the valve body (2) are closed, if the position covered by the valve plate is offset, the edge of the valve plate will slide along the guide structure to a position with better sealing. Generally speaking, the higher the concentricity between the valve plate and the vent, the better the sealing effect between the valve plate and the valve body (2). The guide structure can guide the valve plate to slide to a position with higher concentricity with the vent, and the sealing effect between the valve plate and the valve body (2) is better.

[0021] During use of the prior art product, the valve plate and the valve body (2) cannot be aligned with the vents on the valve body (2) due to processing accuracy problems or installation problems. When the deviation of the alignment of the valve plate and the vents on the valve body (2) exceeds a certain degree, the valve plate cannot completely cover the vents, resulting in air leakage. Or even if the valve plate covers the vents crookedly, due to processing accuracy or design reasons, when the valve plate cannot cover the predetermined area, the contact sealing between the valve plate and the valve body (2) will deteriorate, and a high sealing effect cannot be achieved. In view of this defect, the present invention achieves a better sealing effect by introducing a guide structure.

[0022] Furthermore, the edge of the valve plate or a position close to the edge has a first inclined surface, and the guide structure is a structure protruding outward. When the valve plate and the valve body (2) are closed, the first inclined surface contacts the protruding guide structure, and under the drive of the connecting rod (3), the protruding guide structure guides the first inclined surface to slide along the guide structure, driving the valve plate to move toward a position with a better sealing effect. Ultimately, a better sealing effect is achieved. The "protruding outward" refers to a protrusion pointing in the direction of air outlet.

[0023] Furthermore, the guiding structure is one or more structures such as guiding slopes and guiding strips.

[0024] Furthermore, when the guide structure is a guide bar, the guide bar can be selected from one or more of a circular guide bar, a square guide bar, and a polygonal guide bar. The guide bar can be fixed to the valve body (2) by welding and protrude in the direction of the air outlet.

[0025] Furthermore, when the guiding structure is a guiding slope, the guiding slope is a guiding slope surrounding the air outlet, or is one or more raised guiding slopes, or a combination of the two.

[0026] Further, the guiding slope includes a first guiding slope surrounding the air outlet, and a second guiding structure closer to the center of the air outlet than the first guiding slope. Further, the second guiding structure is a single or multiple second guiding slopes arranged on the first guiding slope. The first guiding slope is preferably a guiding slope surrounding the air outlet.

[0027] When this structure is adopted, the sealing performance of the valve can be improved by the cooperation between the first guide slope and the first slope on the valve plate. When the first guide slope is a guide slope surrounding the air outlet, the sealing performance is better.

[0028] In addition, when the valve plate is relatively far offset from the vent of the valve body (2), in order to guide the valve plate, the guide structure must be closer to the vent and inside. At this time, if the second guide structure is still a slope surrounding the air outlet, or one or more long strips of slope surrounding the air outlet, the more it extends into the inside of the vent, the smaller the air volume of the air outlet is, which reduces the smoke exhaust performance of the valve. Here, one or more small raised slopes or guide strips are set at a position more inside than the first slope. Compared with the long raised slope or the raised slope surrounding the air outlet, the small raised slope or guide strip has less effect on the air volume of the air outlet. At this time, the impact on the air volume can be reduced while taking into account the sealing performance, and the overall performance of the product is more excellent.

[0029] When the second guide structure is a single or multiple guide slopes arranged on the first guide slope, at this time, the second guide slope and the first guide slope are preferably an integrated structure. At this time, the original shapes corresponding to the first guide slope and the second guide slope can be cut on the raw material sheet for stamping, and then integrally formed by stamping. The processing method is simple, the cost is low, and the effect is excellent. This design is an innovative design solution proposed after fully studying the use environment and requirements of the fire check valve, taking into account many requirements such as product sealing requirements, ventilation requirements, processing convenience requirements, and product stability requirements.

[0030] Furthermore, the check valve further comprises a second rebound structure and a fuse device, wherein the second rebound structure is mounted on a base, and the fuse device fixes one end of the second rebound structure. When the ambient temperature exceeds the fusing temperature of the fuse device, the fuse device is blown, releasing the second rebound structure, causing the second rebound structure to rebound, thereby directly or indirectly pressing the connecting rod (3), thereby closing the valve plate and the valve body (2). The second rebound structure may press the connecting rod (3) directly or by other driving mechanisms, and no special restrictions are imposed here.

[0031] Beneficial Effects

[0032] The valve body (2) of the present invention has a simple structure, is easy to install, has high reliability, and has a low manufacturing cost. It can be used in various fields such as industry and housing that require a fireproof check valve, and is particularly suitable for exhaust pipes for oil smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 -3 Structural diagram of an embodiment of the present invention

[0034] Figure 4 A schematic diagram of the structure of a check valve mechanism according to an embodiment of the present invention

[0035] Among them, 1 valve plate; 2 valve body; 2-1 upper valve body; 2-2 first guide structure; 2-3 second guide structure; 2-4 lower valve body; 3 connecting rod; 3-1 connecting rod horizontal axis; 4 valve plate connecting piece; 5 base; 6 pressing plate; 6-1 pressing plate driving pin; 6-2 pressing plate clamping part; 7 first shaft pin; 8 second shaft pin; 9 first rebound component; 10 second rebound component; 11 fuse component; 12 positioning plate. DETAILED DESCRIPTION

[0036] The present invention is described below based on embodiments. Those skilled in the art should understand that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0037] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0038] Embodiment 1:

[0039] A check valve comprises a valve plate (1), a valve body (2), a connecting rod (3), a base (5), a first resilient component (9), a second resilient component (10), a first shaft pin (7), a second shaft pin (8), and a fuse component (11), wherein the first shaft pin (7) and the second shaft pin (8) are mounted on the base (5), the base (5) is mounted on the valve body (2), one end of the connecting rod (3) is movably connected to the first shaft pin (7) on the base, and the other end is connected to the valve plate (1) via a connecting component 4, The first resilient component (9) provides a resilient force for the connecting rod (3) to drive the connecting rod (3) to rotate relative to the base. The second resilient component (10) is mounted on the second shaft pin (8). The first arm of the second resilient component (10) is constrained by the fuse component (11). When the ambient temperature is higher than the fusing temperature of the fuse component (11), the fuse component (11) melts and releases the constraint on the first arm of the second resilient component. The first arm rebounds and drives the connecting rod (3) to close the valve plate (1) and the valve body (2).

[0040] In one embodiment, the fuse component (11) is mounted on the base (5), such as Figure 1 As shown; in another embodiment, the fuse component (11) is installed on the valve body (2).

[0041] In one embodiment, the first resilient component (9) is mounted on the first axle pin (7) to provide a resilient force for the connecting rod (3). Figure 1As shown; in another embodiment, the first rebound component (9) is installed on the second shaft pin (8) to provide rebound force for the connecting rod (3).

[0042] The connecting rod (3) has a holding portion, which is a groove on the connecting rod (3). The first arm of the second resilient component has a bending portion, which is bent in the direction of the connecting rod (3). When the fuse component is blown, the bending portion presses on the connecting rod (3) to drive the connecting rod (3) to rotate and close the valve. After the valve is closed, the bending portion on the first arm of the second resilient component hooks the holding portion to keep the valve closed. With this structure, the connecting rod (3) is connected to the first shaft pin, and the second resilient component is installed on the second shaft pin. When the valve is closed, the contact points of the first shaft pin, the second shaft pin, the bending portion and the holding portion form a triangular locking structure from the side, so that even if the rebound force of the second resilient portion is greatly reduced in a high temperature environment, the triangular structure itself can prevent the valve from opening to a certain extent.

[0043] Embodiment 2:

[0044] A check valve comprises a valve plate (1), a valve body (2), a connecting rod (3), a base (5), a first resilient component (9), a second resilient component (10), a first shaft pin (7), a second shaft pin (8), and a fuse component (11), wherein the first shaft pin (7) and the second shaft pin (8) are mounted on the base (5), the base (5) is mounted on the valve body (2), one end of the connecting rod (3) is movably connected to the first shaft pin (7) on the base, and the other end is connected to the valve plate (1) via a connecting component 4, The first resilient component (9) provides a resilient force for the connecting rod (3) to drive the connecting rod (3) to rotate relative to the base. The second resilient component (10) is mounted on the second shaft pin (8). The first arm of the second resilient component (10) is constrained by the fuse component (11). When the ambient temperature is higher than the fusing temperature of the fuse component (11), the fuse component (11) melts and releases the constraint on the first arm of the second resilient component. The first arm rebounds and drives the connecting rod (3) to close the valve plate (1) and the valve body (2). The fuse component is mounted on the valve body (2). The first resilient component is mounted on the second shaft pin to provide a resilient force for the connecting rod (3).

[0045] In one embodiment, the fuse component (11) is mounted on the base (5); in another embodiment, the fuse component (11) is mounted on the valve body (2).

[0046] In one embodiment, the first resilient component (9) is mounted on the first axle pin (7) to provide a resilient force for the connecting rod (3); in another embodiment, the first resilient component (9) is mounted on the second axle pin (8) to provide a resilient force for the connecting rod (3).

[0047] In one embodiment, the connecting rod (3) has a connecting rod transverse axis (3-1) fixed to the connecting rod (3); in a preferred embodiment, the connecting rod transverse axis passes through the connecting rod (3) and is substantially perpendicular to the motion surface swept by the connecting rod (3). The shape of the connecting rod transverse axis can be circular, triangular, square, polygonal, etc.

[0048] The second rebound spring has a bent portion, and the bending direction is toward the direction of the connecting rod transverse axis, so that it can finally hook the transverse axis when the constraint is released. The fuse component melts and releases the constraint of the first arm of the second rebound component, and the first arm rebounds and presses on the connecting rod transverse axis, and drives the connecting rod (3) through the connecting rod transverse axis to close the valve plate and the valve body (2). When the valve body is closed, the connecting rod transverse axis is located at the bent portion, and the bent portion of the first arm hooks the connecting rod transverse axis.

[0049] Embodiment 3:

[0050] A check valve comprises a valve plate (1), a valve body (2), a connecting rod (3), a base (5), a first resilient component (9), a second resilient component (10), a first shaft pin (7), a second shaft pin (8), and a fuse component (11), wherein the first shaft pin (7) and the second shaft pin (8) are mounted on the base (5), the base (5) is mounted on the valve body (2), one end of the connecting rod (3) is movably connected to the first shaft pin (7) on the base, and the other end is connected to the valve plate (1) via a connecting component 4, The first resilient component (9) provides a resilient force for the connecting rod (3) to drive the connecting rod (3) to rotate relative to the base. The second resilient component (10) is mounted on the second shaft pin (8). The first arm of the second resilient component (10) is constrained by the fuse component (11). When the ambient temperature is higher than the fusing temperature of the fuse component (11), the fuse component (11) melts and releases the constraint on the first arm of the second resilient component. The first arm rebounds and drives the connecting rod (3) to close the valve plate (1) and the valve body (2). The fuse component is mounted on the valve body (2). The first resilient component is mounted on the second shaft pin to provide a resilient force for the connecting rod (3).

[0051] The check valve further comprises a positioning piece (12), which is fixed at a preset position by a slot on the base and a first shaft pin passing through a through hole on the positioning piece. Since the positioning piece is adjacent to the connecting rod, the positioning piece can provide constraints for the movement of the connecting rod when the connecting rod moves, thereby improving the stability of the movement trajectory of the connecting rod.

[0052] In one embodiment, the fuse component (11) is mounted on the base (5); in another embodiment, the fuse component (11) is mounted on the valve body (2).

[0053] In one embodiment, the first resilient component (9) is mounted on the first axle pin (7) to provide a resilient force for the connecting rod (3); in another embodiment, the first resilient component (9) is mounted on the second axle pin (8) to provide a resilient force for the connecting rod (3).

[0054] In one embodiment, the connecting rod (3) has a connecting rod transverse axis (3-1) fixed to the connecting rod (3); in a preferred embodiment, the connecting rod transverse axis passes through the connecting rod (3) and is substantially perpendicular to the moving surface swept by the connecting rod (3) when the connecting rod (3) rotates. The shape of the connecting rod transverse axis can be circular, triangular, square, polygonal, etc.

[0055] The check valve also includes a pressing plate, a holding portion (6-2) is provided on the pressing plate (6), the holding portion is a groove, a pressing plate driving pin (6-1) is provided on the pressing plate, a connecting rod transverse axis (3-1) is installed on the connecting rod (3), a first resilient component provides a resilient force for the connecting rod (3), a pressing plate driving pin (6-1) is installed on the pressing plate (6), a first arm of the second resilient component is pressed on the pressing plate driving pin (6-1), and the fuse component (11) constrains the first arm of the second resilient component by constraining the pressing plate driving pin (6-1). When the fuse component is blown, the first arm of the second resilient component drives the pressing plate to rotate through the pressing plate driving pin, and the pressing plate rotates and presses on the connecting rod transverse axis (3-1) on the connecting rod (3), and drives the connecting rod (3) to rotate through the connecting rod transverse axis, so that the valve is closed. When the check valve is closed, the connecting rod transverse axis (3-1) is located in the clamping portion (6-2) of the pressing plate, and the clamping portion of the pressing plate hooks the connecting rod transverse axis. With this structure, when the check valve is closed, since the first shaft pin, the second shaft pin, and the connecting rod transverse axis form a triangular structure, even if the elastic force of the second resilient component decreases at high temperature, the valve can be kept closed by using this triangular structure, thereby ensuring that the valve can be kept closed even at high temperature.

[0056] In a further preferred embodiment, the first arm of the first resilient component is directly pressed on the connecting rod (3) to provide a resilient force for the connecting rod (3). In another preferred embodiment, the first arm of the first resilient component is pressed on the connecting rod transverse axis (3-1) on the connecting rod (3) to provide a resilient force to the connecting rod (3) via the connecting rod transverse axis.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A check valve, characterized in that: It includes a valve disc, a valve body, a connecting rod, a base, a first resilient component, a second resilient component, a first shaft pin, a second shaft pin, and a fuse component. The first shaft pin and the second shaft pin are installed on the base, and the base is installed on the valve body. One end of the connecting rod is movably connected to the first shaft pin on the base, and the other end is connected to the valve disc. The first resilient component provides a rebound force for the connecting rod to drive the connecting rod to rotate relative to the base. The second resilient component is installed on the second shaft pin. The first arm of the second resilient component is constrained by the fuse component. When the ambient temperature is higher than the fusing temperature of the fuse component, the fuse component melts and releases the constraint on the first arm of the second resilient component. The first arm rebounds and drives the connecting rod to close the valve disc and the valve body. The connecting rod has a holding portion, and the first arm of the second resilient component has a bending portion. When the fuse component is melted, the bending portion presses on the connecting rod to drive the connecting rod to rotate and close the valve. After the valve is closed, the bending portion on the first arm hooks the holding portion to keep the valve closed. The fuse component is mounted on the base, or the fuse component is mounted on the valve body; the first rebound component is mounted on the first shaft pin to provide rebound force for the connecting rod, or the first rebound component is mounted on the second shaft pin.

2. The check valve according to claim 1, characterized in that: The clamping portion on the connecting rod is a protrusion structure or a groove structure located on the connecting rod.

3. A check valve, characterized in that: It includes a valve disc, a valve body, a connecting rod, a base, a first resilient component, a second resilient component, a first shaft pin, a second shaft pin, and a fuse component. The first shaft pin and the second shaft pin are installed on the base, and the base is installed on the valve body. One end of the connecting rod is movably connected to the first shaft pin on the base, and the other end is connected to the valve disc. The first resilient component provides a rebound force for the connecting rod to drive the connecting rod to rotate relative to the base. The second resilient component is installed on the second shaft pin. The first arm of the second resilient component is constrained by the fuse component. When the ambient temperature is higher than the fusing temperature of the fuse component, the fuse component melts and releases the constraint on the first arm of the second resilient component. The first arm rebounds and drives the connecting rod to close the valve disc and the valve body. The check valve further comprises a pressing plate, a holding portion is provided on the pressing plate, a connecting rod transverse axis is installed on the connecting rod, a first resilient component provides a resilient force for the connecting rod, a first arm of the second resilient component is constrained by a fuse component, when the fuse component is blown, the fuse component releases the constraint on the first arm of the second resilient component, the first arm of the second resilient component drives the pressing plate, the pressing plate rotates and presses on the connecting rod transverse axis, the connecting rod is driven to rotate by the connecting rod transverse axis, and the check valve is closed, when the check valve is closed, the connecting rod transverse axis is at the holding portion of the pressing plate; The fuse component is mounted on the base, or the fuse component is mounted on the valve body; the first rebound component is mounted on the first shaft pin to provide rebound force for the connecting rod, or the first rebound component is mounted on the second shaft pin.

4. The check valve according to claim 3, characterized in that: The clamping portion on the pressing sheet is a concave structure on the pressing sheet.

5. The check valve according to claim 3, characterized in that: A pressing plate driving pin is installed on the pressing plate, and the first arm of the second resilient component is pressed on the pressing plate driving pin. The fuse component constrains the first arm of the second resilient component by constraining the driving pin. When the fuse component melts, the first arm of the second resilient component drives the pressing plate to rotate through the pressing plate driving pin. The pressing plate rotates and presses on the connecting rod horizontal axis on the connecting rod. The connecting rod is driven to rotate through the connecting rod horizontal axis to close the valve. When the valve is closed, the connecting rod horizontal axis is just located on the clamping part on the pressing plate.

6. The check valve according to claim 5, characterized in that: The first arm of the first resilient component directly presses on the connecting rod to provide a resilient force for the connecting rod, or the first arm of the first resilient component presses on a connecting rod transverse axis on the connecting rod to provide a resilient force to the connecting rod through the connecting rod transverse axis.

7. The check valve according to claim 1 or 3, characterized in that: It also includes a positioning component, which positions the position of the connecting rod. The positioning component can be movably installed on the first axle pin, and the position of the connecting rod on the first axle pin can be adjusted by adjusting the position of the positioning component, or the positioning component is fixedly installed on the first axle pin.

8. The check valve according to claim 7, characterized in that: The positioning component is a positioning piece with a through hole, and the positioning piece is adjacent to the connecting rod.

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