A check valve

Abstract

The present application relates to the technical field of valve, and discloses a check valve. The check valve comprises a valve body, a rotating shaft, a valve piece, a guide piece and a counterweight part. The valve body is formed with an exhaust passage extending in a preset direction, the rotating shaft is connected with the valve body and arranged at one end of the exhaust passage, the angle between the rotating shaft and the vertical direction is θ, the valve piece is rotationally connected with the rotating shaft, the valve piece has a closed state of blocking the outlet of the exhaust passage and an open state of opening the outlet, the guide piece is arranged on the valve piece, the extension direction of the guide piece is arranged at an angle with the rotating shaft, and the counterweight part is configured to move along the guide piece towards the end close to the rotating shaft when the valve piece is opened. The check valve of the present application has small resistance to airflow after the valve piece is opened, smooth exhaust, and good sealing when the valve piece is closed.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a check valve. Background Technology

[0002] A check valve is a valve installed between the exhaust outlet of a kitchen range hood / bathroom exhaust fan and a shared exhaust duct with a fire-resistant rating. When the range hood / exhaust fan is working, the fire-resistant check valve is open, allowing waste gas to be discharged into the shared exhaust duct. When the range hood / exhaust fan is not working, the fire-resistant check valve is in a naturally closed state, preventing waste gas from flowing back into the shared exhaust duct.

[0003] like Figure 1 As shown, the double-blade check valve is a mainstream mechanical check valve. The check valve includes a valve port 1′ with an airflow channel, and two valve plates 2′ mounted on the valve port 1′ via a rotating shaft. When closed, the two valve plates 2′ are coplanar, and the plane 4′ containing the valve plates forms an angle θ with the vertical plane 3′. A torsion spring 5′ is also installed between the valve plates 2′ and the rotating shaft. When the range hood / exhaust fan discharges airflow, the airflow overcomes the weight of the valve plates 2′ and the force of the torsion spring 5′, causing the valve plates 2′ to open, thus achieving exhaust. When the range hood / exhaust fan is not working, the valve plates 2′ close due to their own weight and the force of the torsion spring 5′ to ensure good sealing.

[0004] In check valve design, reducing the resistance of the valve plate to smoke exhaust requires reducing the weight of the valve plate or decreasing the torsion spring torque. However, this may worsen the sealing performance when the valve plate is closed, leading to backflow of smoke and odors. Conversely, improving the sealing performance requires increasing the weight of the valve plate or strengthening the spring torque, which increases the smoke exhaust resistance of the range hood, potentially causing poor smoke extraction. In other words, there is a trade-off between smoke exhaust resistance and valve plate sealing performance.

[0005] Therefore, there is an urgent need for a check valve to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a check valve that minimizes airflow obstruction and ensures smooth exhaust when the valve plate is open, and provides good sealing when the valve plate is closed.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A check valve, comprising:

[0009] The valve body has an exhaust passage that extends axially in a preset direction;

[0010] A rotating shaft is connected to the valve body and is located at one end of the exhaust passage. The angle between the rotating shaft and the vertical direction is θ.

[0011] a valve plate, in rotational cooperation with the rotating shaft, the valve plate having a closed state in which the valve plate blocks the outlet of the exhaust passage and an open state in which the valve plate opens the outlet of the exhaust passage;

[0012] a guide member, disposed on the valve plate, the guide member having an extension direction at an angle with the rotating shaft;

[0013] a counterweight part, configured to move along the guide member towards an end close to the rotating shaft when the valve plate is in the open state.

[0014] Preferably, the height of the end of the guide member away from the rotating shaft is lower than the height of the end of the guide member close to the rotating shaft when the valve plate is in the closed state.

[0015] Preferably, a closed guide chamber is formed on the guide member, and the counterweight part is accommodated in the guide chamber and can move in the extension direction of the guide member in the guide chamber.

[0016] Preferably, the counterweight part comprises a counterweight block and / or a counterweight fluid.

[0017] Preferably, the check valve comprises two valve plates, the two valve plates being symmetrically disposed about the rotating shaft.

[0018] Preferably, the check valve further comprises a sealing member, the sealing member being disposed on the edge of the valve plate and being capable of pressing against the valve plate at the outlet of the exhaust passage.

[0019] Preferably, a vertical plane perpendicular to the preset direction is a first plane reference, a plane passing through the rotating shaft and having an angle θ with the first plane reference is a second plane reference, and the angle between the plane in which the valve plate is located when in the closed state and the second plane reference is α, α being an acute angle.

[0020] Preferably, the check valve further comprises a locking mechanism, the locking mechanism being capable of locking the valve plate in the closed state when the temperature is higher than a preset temperature.

[0021] Preferably, the locking mechanism comprises:

[0022] a mounting frame, connected to the valve body and parallel to the rotating shaft;

[0023] a sliding block, movably connected to the mounting frame and having a first position and a second position relative to the mounting frame;

[0024] a fuse member, having two ends respectively connected to the mounting frame and the sliding block, the fuse member being capable of being fused at a preset temperature;

[0025] a resilient member, having two ends respectively connected to the mounting frame and the sliding block and being capable of deforming along the length direction of the mounting frame.

[0026] A linkage assembly is rotatably connected with the slider and the mounting frame, respectively;

[0027] When the fuse element is not fused, the slider is in a first position and the linkage assembly is retracted, and after the fuse element is fused, the elastic element can drive the slider to move to a second position, so that the linkage assembly is deployed and the valve plate is pressed to the closed state.

[0028] Preferably, the linkage assembly comprises:

[0029] A first linkage, one end of which is rotatably connected with the mounting frame and the other end of which extends towards the valve plate;

[0030] A second linkage, one end of which is rotatably connected with the slider and the other end of which is rotatably connected with the middle part of the first linkage, and part of the first linkage, the second linkage and part of the mounting frame form a triangle.

[0031] Preferably, a long hole parallel to the rotation shaft is arranged on the mounting frame, the locking mechanism further comprises a first hinge shaft, the first hinge shaft passes through the slider and the long hole in sequence, the second linkage is hinged with the first hinge shaft, and the elastic element is connected with the first hinge shaft.

[0032] Preferably, the elastic element is sleeved on the rotation shaft.

[0033] The present application has the following advantages:

[0034] The check valve of the present application is arranged at an angle with the vertical direction, and the valve plate is rotatably connected with the rotation shaft, so that the plane of the valve plate is at an angle with the vertical direction. When there is no airflow blowing the valve plate, the valve plate can maintain the closed state of plugging the exhaust passage outlet under the action of its own gravity, and the valve plate can be pressed against the valve body under the action of the gravity of the counterweight, thereby ensuring good sealing performance. When there is airflow blowing the valve plate, the valve plate rotates around the rotation shaft and opens the airflow passage, and at this time, the counterweight moves along the guide member and approaches the rotation shaft. Although the gravity of the whole formed by the valve plate and the counterweight does not change, the center of gravity of the whole formed by the valve plate and the counterweight approaches the rotation shaft, which is equivalent to reducing the force arm, thereby greatly reducing the torque that needs to be overcome by the airflow, i.e. reducing the resistance of the valve plate to the airflow, thereby ensuring smooth airflow. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic view of a check valve provided by the prior art;

[0036] Figure 2 is a structural schematic view of a check valve provided by the embodiment of the present application from one perspective when the valve plate is in the closed state and the locking mechanism does not lock the valve plate.

[0037] Figure 3 is a top view of the check valve in the open state of the valve disc provided by the specific embodiment of the present application;

[0038] Figure 4 is a schematic view of the check valve at the air inlet side provided by the specific embodiment of the present application;

[0039] Figure 5 is a structural schematic view of the check valve in the open state of the valve disc provided by the specific embodiment of the present application;

[0040] Figure 6 is a side view of the check valve provided by the specific embodiment of the present application;

[0041] Figure 7 is a schematic view of A in Figure 6 ;

[0042] Figure 8 is a structural schematic view of the check valve in the closed state of the valve disc, and another view of the locking mechanism not locking the valve disc provided by the specific embodiment of the present application;

[0043] Figure 9 is a structural schematic view of the check valve in the closed state of the valve disc, and the locking mechanism locking the valve disc provided by the specific embodiment of the present application.

[0044] in the figure:

[0045] 1'-valve port; 2'-valve disc; 3'-vertical plane; 4'-plane where the valve disc is located; 5'-torsion spring;

[0046] 1-valve body; 11-valve seat; 12-valve port; 2-rotating shaft; 3-valve disc; 4-guide; 41-guide chamber; 5-counterweight; 6-seal;

[0047] 7-locking mechanism; 71-mounting frame; 711-long hole; 72-sliding block; 73-fuse; 74-elastic member; 75-linkage assembly; 751-first linkage; 7511-body part; 7512-bent part; 752-second linkage; 76-first hinged shaft; 77-second hinged shaft; 78-positioning pin; 8-bracket; 9-clamp spring;

[0048] P1-first plane reference; P2-second plane reference. DETAILED DESCRIPTION

[0049] The present application will be further described below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only for the purpose of explaining the present application, but not for limiting the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0050] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0052] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0053] The present embodiment provides a check valve which can be used to be installed at a position between an air outlet of a kitchen range hood and a shared exhaust duct with a fire resistance rating, between an air outlet of a bathroom exhaust fan and a shared exhaust duct with a fire resistance rating, etc. Of course, the check valve can also be used in other use scenarios where it is necessary to control the airflow to flow only in one direction, which is not limited here.

[0054] As Figure 2As shown, the check valve comprises a valve body 1, the valve body 1 comprises a valve seat 11 and a valve port 12, the valve seat 11 is generally plate-shaped, and the valve seat 11 is used to fix the check valve in the position to be installed. The valve port 12 is connected to one side of the valve seat 11 and has a cylindrical structure. The valve seat 11 is formed with an exhaust passage extending in a preset direction. It should be noted that the preset direction represents the extension direction of the exhaust passage when the check valve is normally used, and the preset direction is the horizontal direction in this embodiment. Of course, the horizontal direction includes the strict horizontal direction, and also includes the direction at a small angle with the horizontal direction. In other embodiments, the end of the valve port 12 away from the valve body 1 constitutes the exhaust passage extending in the horizontal direction, and the specific extension direction of the end of the valve port 12 close to the valve seat 11 is not limited, which can be adjusted according to the actual application scene. In this embodiment, the longitudinal section of the exhaust passage is circular.

[0055] Preferably, as Figure 2 shown, the check valve further comprises a rotating shaft 2 and two valve plates 3. The rotating shaft 2 is connected to the valve body 1 and located at one end of the outlet of the exhaust passage. Specifically, the rotating shaft 2 is located at the middle part of the end face of the exhaust passage, and the valve plate 3 is generally semicircular in shape. The two valve plates 3 are symmetrically arranged on both sides of the rotating shaft 2, and each valve plate 3 is rotationally connected with the rotating shaft 2, so that the valve plate 3 has a closed state (as Figure 2 shown) of blocking the outlet of the exhaust passage and an open state (as Figure 3 shown) of opening the outlet of the exhaust passage.

[0056] Specifically, in this embodiment, as Figure 2 shown, the check valve comprises two brackets 8, and the two brackets 8 are respectively connected to the upper and lower ends of the valve port 12. The upper and lower ends of the rotating shaft 2 are respectively connected with the two brackets 8. Specifically, the bracket 8 can be connected to the valve port 12 by welding. Further, the rotating shaft 2 passes through the two brackets 8 in sequence and extends out of the brackets 8 at both ends. The part of the rotating shaft 2 extending out of the bracket 8 is clamped with a circlip 9, and the circlip 9 is sleeved on the rotating shaft 2 and abuts against the bracket 8, so as to achieve the axial limiting of the rotating shaft 2.

[0057] Preferably, the angle between the rotating shaft 2 and the vertical direction is θ, and since the valve plate 3 is rotationally connected with the rotating shaft 2, the valve plate 3 has a certain angle with the vertical direction. Then, when there is no airflow blowing the valve plate 3, the valve plate 3 abuts against the end face of the valve body 1 under the action of its own gravity, so as to be in the closed state of blocking the outlet of the exhaust passage. When the airflow blows the valve plate 3, the valve plate 3 rotates around the rotating shaft 2 and leaves the valve body 1, so as to be in the open state of opening the exhaust passage.

[0058] Preferably, as Figure 4 and Figure 5As shown, the check valve further comprises a guide 4 and a counterweight part 5. The guide 4 is arranged on the valve plate 3, and the extension direction of the guide 4 is arranged at an angle with the rotation shaft 2 (i.e. the guide 4 extends approximately along the radial direction of the valve plate 3), and the counterweight part 5 is configured to move along the guide 4 towards the end close to the rotation shaft 2 when the valve plate 3 is opened.

[0059] The working principle of the check valve in this embodiment is as follows: when there is no airflow blowing the valve plate 3, the valve plate 3 is in a closed state of plugging the outlet of the exhaust passage, and at this time the counterweight part 5 is located at the end far away from the rotation shaft 2, and the counterweight part 5 is far away from the rotation shaft 2, so it has a long force arm, and under the joint action of the gravity of the valve plate 3 and the gravity of the counterweight part 5, the valve plate 3 can be pressed against the valve body 1, thereby ensuring good sealing performance; when there is airflow blowing the valve plate 3 through the exhaust passage, the airflow generates a torque on the valve plate 3, the valve plate 3 rotates around the rotation shaft 2 and opens the airflow passage, at this time the counterweight part 5 moves along the guide 4 and approaches the rotation shaft 2, although the gravity of the whole formed by the valve plate 3 and the counterweight part 5 does not change, but the center of gravity of the whole formed approaches the rotation shaft 2, which is equivalent to reducing the force arm, thereby greatly reducing the torque that the airflow needs to overcome, that is, reducing the resistance of the valve plate 3 to the airflow, thereby ensuring smooth airflow.

[0060] Preferably, in this embodiment, as shown in Figure 4 When the valve plate 3 is in a closed state, the end of the guide 4 far away from the rotation shaft 2 is lower than the end close to the rotation shaft 2. At this time, the counterweight part 5 can automatically move to the end far away from the rotation shaft 2 under the action of its own gravity, thereby providing better pressing effect on the valve plate 3 and improving the sealing performance of the valve plate 3. As shown in Figure 5 When the valve plate 3 switches from a closed state to an open state, since the plane where the valve plate 3 is located is an inclined plane, therefore the end close to the rotation shaft 2 of the guide 4 gradually becomes lower than the end far away from the rotation shaft 2 in the process of the valve plate 3 rotating around the rotation shaft 2, that is, when the valve plate 3 is opened, the counterweight part 5 moves to the end close to the rotation shaft 2 under the action of its own gravity, so as to reduce the resistance of the valve plate 3 to the airflow.

[0061] In this embodiment, as shown in Figure 4 and Figure 5 The guide 4 is a housing-shaped component, and a guide chamber 41 consistent with the extension direction of the guide 4 is formed in the guide 4, and the counterweight part 5 is arranged in the guide chamber 41. The guide chamber 41 can guide the movement of the counterweight part 5, so that the counterweight part 5 can move smoothly when the valve plate 3 switches states. Preferably, the guide chamber 41 is a closed chamber, thereby preventing oil fume in the airflow from depositing and causing the counterweight part 5 to be unable to move smoothly, and improving the service life of the check valve.

[0062] Optionally, in this embodiment, as shown in Figure 4As shown, the counterweight 5 is a counterweight block, and the shape of the counterweight block is a cube. The corresponding guide chamber 41 is a cuboid that matches the shape of the counterweight block. In other embodiments, the counterweight block can also be spherical, thereby further improving the smoothness of the counterweight block's movement. In another embodiment, the counterweight 5 is not limited to being a fixed block; the counterweight 5 can also be a counterweight fluid, such as a liquid or quicksand, which is not specifically limited here.

[0063] Preferably, such as Figure 3 and Figure 4 As shown, the check valve also includes a sealing element 6, which is arranged around the edge of the valve plate 3. When the valve plate 3 is in the closed state, the sealing element 6 presses against the valve plate 3 and the valve body 1 (at the outlet of the exhaust channel). The sealing element 6 further improves the sealing performance of the check valve. Specifically, the check valve includes two sealing elements 6, which are respectively arranged around the edges of the two valve plates 3. Optionally, the sealing element 6 can be made of rubber material, which provides good sealing performance and generates less noise when the valve plate 3 is closed.

[0064] Preferably, such as Figure 6 and Figure 7 As shown, perpendicular to the preset direction ( Figure 6 The vertical plane (in the X direction) is the first plane reference P1, the plane passing through the rotating shaft 2 and having an angle of θ with the first plane reference P1 is the second plane reference P2, and the angle between the plane where the valve plate 3 is located when it is in the closed state and the second plane reference P2 is α, where α is an acute angle.

[0065] It is understandable that the component of the overall gravity of the valve plate 3 and the counterweight 5 perpendicular to the plane of the valve plate 3 is the key factor preventing the valve plate 3 from opening. However, as the valve plate 3 rotates around the axis 2 and the opening angle gradually increases, this component of gravity gradually decreases. In other words, as the opening angle of the valve plate 3 increases, the obstruction of airflow by the valve plate 3 decreases. In this embodiment, by having the plane of the valve plate 3 and the second plane reference P2 form an angle α when the valve plate 3 is in the closed state (equivalent to giving the valve plate 3 a certain pre-opening angle), compared to the prior art (such as...), Figure 1 As shown, if the plane where the valve plate 3 is in the closed state is parallel to the second plane reference P2, it can not only reduce the force required for the airflow to open the valve plate 3, making the valve plate 3 easier to open, but also, when the airflow blows the valve plate 3 to rotate by an angle β, the actual opening angle of the check valve can reach (α+β), thereby making the airflow discharge smoother.

[0066] Preferably, α is an acute angle less than 45°. Alternatively, α can be 10°, 15°, 30°, etc., and is not specifically limited here.

[0067] When fire occurs in one of the two chambers on both sides of the check valve or in one side of the common exhaust duct, the check valve needs to prevent the fire / smoke from passing through the valve disc 3 of the check valve to the unburned side, i.e., to achieve the effect of smoke and fire prevention. For this purpose, as shown in Figure 2 and Figure 3 , the check valve further comprises a locking mechanism 7 which can lock the valve disc 3 in the closed state when the temperature is higher than the preset temperature, thereby preventing the spread of fire / smoke from one side of the check valve to the other side, thereby improving safety.

[0068] Specifically, as shown in Figure 2 , Figure 8 and Figure 9 , the locking mechanism 7 comprises a mounting frame 71, a sliding block 72, a fuse 73, an elastic member 74, and a linkage assembly 75. The mounting frame 71 is arranged parallel to the rotating shaft 2 and connected to the brackets 8 at the upper and lower ends of the valve body 1. The sliding block 72 is movably connected to the mounting frame 71 and has a first position and a second position relative to the mounting frame 71. The two ends of the fuse 73 are connected to the upper end of the mounting frame 71 and the sliding block 72, respectively, and the fuse 73 can be melted at a preset temperature. The two ends of the elastic member 74 are connected to the sliding block 72 and the lower end of the mounting frame 71, respectively, and the elastic member 74 can be deformed along the length direction of the mounting frame 71. The linkage assembly 75 is rotatably connected to the sliding block 72 and the mounting frame 71. It should be noted that the locking mechanism 7 comprises two sets of linkage assemblies 75, and each set of linkage assembly 75 is arranged to press one valve disc 3 when unfolded.

[0069] The working principle of the locking mechanism 7 is as follows: as shown in Figure 2 , when the fuse 73 is not melted, the fuse 73, the sliding block 72, and the elastic member 74 are sequentially connected and in a tensioned state, at this time the sliding block 72 is in the first position, the elastic member 74 stores a certain elastic potential energy, and the linkage assembly 75 is in a folded state and does not affect the normal opening and closing of the valve disc 3. As shown in Figure 9 , when the fuse 73 reaches the preset temperature due to fire on one side of the check valve, the fuse 73 is melted, at this time the elastic member 74 loses the binding force, so the elastic potential energy of the elastic member 74 is released and drives the sliding block 72 from the first position to the second position. Since the linkage assembly 75 is hingedly connected to the sliding block 72 and the mounting frame 71, during the movement of the sliding block 72, the linkage assembly 75 is unfolded to press the valve disc 3 in the closed state, thereby preventing the flow of fire / smoke through the valve disc 3, so as to achieve the effect of fire prevention.

[0070] The trigger condition of the locking mechanism 7 is the melting of the fuse 73, and the specific melting temperature of the fuse 73 is determined by the material itself and is not disturbed or controlled by the circuit or other driving sources, so the reliability is good. It can be understood that the specific material of the fuse 73 can be selected according to the preset temperature, which is not limited here.

[0071] In this embodiment, Figure 8 The slider 72 in the locking mechanism 7 is located at the first position, Figure 9 The slider 72 in the locking mechanism 7 is located at the second position, and the first position is located above the second position. Further, when the fuse 73 is not melted, the elastic member 74 is in a stretched state, and when the fuse 73 is melted, the elastic member 74 returns to the original length (i.e. the length decreases), and drives the slider 72 to move from the first position to the second position. Of course, in other embodiments, the two ends of the elastic member 74 can be connected with the upper end of the mounting frame 71 and the slider 72 respectively. In this scheme, when the fuse 73 is not melted, the elastic member 74 is in a compressed state, and when the fuse 73 is melted, the elastic member 74 returns to the original length (i.e. the length increases), which can also drive the slider 72 to move from the first position to the second position.

[0072] Preferably, as shown in Figure 8 The elastic member 74 is sleeved on the rotating shaft 2. Then the rotating shaft 2 can guide the elastic deformation of the elastic member, ensure that the slider 72 can accurately move to the second position, and further ensure that the connecting rod assembly 75 can reliably press the valve plate 3. As shown in Figure 2 and Figure 8 One end of the fuse 73 is fixed to the upper end of the mounting frame 71 by a bolt or a fastener. The other end of the fuse 73 is provided with a through hole, and the slider 72 is provided with a positioning pin 78, and the through hole of the fuse 73 is sleeved on the positioning pin 78, so as to realize the connection between the fuse 73 and the slider 72.

[0073] In this embodiment, as shown in Figure 8 The fuse 73 and the slider 72 are arranged on the side of the mounting frame 71 away from the valve plate 3, and the rotating shaft 2 is arranged on the side of the mounting frame 71 facing the valve plate 3. Preferably, as shown in Figure 8 and Figure 9 The mounting frame 71 is provided with a long hole 711 parallel to the rotating shaft 2, the locking mechanism 7 further comprises a first hinge shaft 76, the first hinge shaft 76 is connected with the slider 72, and the first hinge shaft 76 is sequentially arranged in the slider 72 and the long hole 711 of the mounting frame 71, so as to reach the side of the mounting frame 71 facing the valve plate 3, and the elastic member 74 is connected with the first hinge shaft 76 to realize the connection with the slider 72. Further, the end of the first hinge shaft 76 close to the rotating shaft 2 is provided with a through hole, and the through hole is sleeved on the rotating shaft 2, so that the rotating shaft 2 can guide the movement of the first hinge shaft 76 and the slider 72, and ensure that the slider 72 can accurately reach the second position.

[0074] Preferably, as shown in Figure 2 and Figure 9 , the linkage assembly 75 comprises a first linkage 751 and a second linkage 752. One end (i.e. the lower end in Figure 2 ) of the first linkage 751 is rotationally connected with the mounting frame 71, and the other end (i.e. the upper end in Figure 2 ) extends towards the valve plate 3. One end (i.e. the upper end in Figure 2 ) of the second linkage 752 is rotationally connected with the slider 72, and the other end (i.e. the lower end in Figure 2 ) is rotationally connected with the middle part of the first linkage 751. Among them, the rotation axis of the first linkage 751 and the mounting frame 71, the rotation axis between the first linkage 751 and the second linkage 752, and the rotation axis between the first linkage 751 and the slider 72 are parallel, at this time, part of the first linkage 751, the second linkage 752 and part of the mounting frame 71 form a triangle, and the three edges of the triangle are hinged with each other. When the slider 72 moves from the first position to the second position, the first linkage 751 rotates around the end connected with the mounting frame 71, so that the other end of the first linkage 751 unfolds and presses against the valve plate 3, thereby pressing the valve plate 3 to the closed state, thereby realizing the function of fire prevention.

[0075] In this embodiment, as shown in Figure 9 , the second linkages 752 on the two valve plates 3 are both rotationally connected with the first hinge shaft 76, thereby realizing the rotational connection with the slider 72. In other embodiments, the second linkages 752 on the two valve plates 3 can also be rotationally connected with the slider 72 through different hinge shafts respectively, which is not limited here. Further, the locking mechanism 7 further comprises two second hinge shafts 77, each of which is connected with the first linkage 751 and the second linkage 752 in the same linkage assembly 75, and the second hinge shaft 77 is parallel to the first hinge shaft 76.

[0076] Preferably, as shown in Figure 2 , each first linkage 751 comprises a body part 7511 and a bending part 7512 at both ends of the body part 7511, and the two bending parts 7512 are parallel to the first hinge shaft 76. The bending part 7512 at the first end of the first linkage 751 is inserted into the mounting frame 71, thereby realizing the rotational connection with the mounting frame 71. The bending part 7512 at the second end of the first linkage 751 extends towards the valve plate 3 on the corresponding side and is used to press against the valve plate 3, and the arrangement of the bending part 7512 at the second end of the first linkage 751 enables the linkage assembly 75 to more conveniently press the valve plate 3 on the corresponding side. In this embodiment, the first linkage 751 is integrally formed, and in other embodiments, the body part 7511 and the bending part 7512 of the first linkage 751 can be machined respectively and then connected together through welding or fastener connection, which is not limited here.

[0077] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A check valve characterized by, The application relates to a check valve. The valve body (1) is provided with an exhaust passage extending in a preset direction; The rotating shaft (2) is connected with the valve body (1) and arranged at one end of the exhaust passage, and the angle between the rotating shaft (2) and the vertical direction is theta; The valve plate (3) is rotationally connected with the rotating shaft (2), and the valve plate (3) has a closed state of blocking the outlet of the exhaust passage and an open state of opening the outlet; The guide (4) is arranged on the valve plate (3), and the extension direction of the guide (4) is arranged at an angle with the rotating shaft (2); The counterweight part (5) is configured to move along the guide (4) towards the end close to the rotating shaft (2) when the valve plate (3) is opened; The vertical plane perpendicular to the preset direction is the first plane reference (P1), the plane passing through the rotating shaft (2) and having an angle theta with the first plane reference (P1) is the second plane reference (P2), the angle between the plane where the valve plate (3) is located in the closed state and the second plane reference (P2) is alpha, alpha is an acute angle, and when the airflow blows the valve plate (3) to rotate by beta, the opening angle of the check valve can reach (alpha+beta).

2. The check valve of claim 1, wherein When the valve plate (3) is in the closed state, the height of the end of the guide (4) away from the rotating shaft (2) is lower than the height of the end of the guide (4) close to the rotating shaft (2).

3. The check valve of claim 1, wherein The guide (4) is provided with a closed guide cavity (41), and the counterweight part (5) is contained in the guide cavity (41) and can move in the extension direction of the guide (4) in the guide cavity (41).

4. The check valve of claim 1, wherein The counterweight part (5) comprises a counterweight block and / or a counterweight fluid.

5. The check valve of claim 1 wherein, The check valve comprises two valve plates (3), and the two valve plates (3) are symmetrically arranged about the rotating shaft (2).

6. The check valve of claim 1, wherein The check valve further comprises a sealing member (6) arranged at the edge of the valve plate (3) and capable of pressing against the valve plate (3) at the outlet of the exhaust passage.

7. The check valve of any one of claims 1-6, wherein, The check valve further comprises a locking mechanism (7) capable of locking the valve plate (3) in the closed state when the temperature is higher than a preset temperature.

8. The check valve of claim 7, wherein The locking mechanism (7) comprises: A mounting frame (71) connected with the valve body (1) and parallel to the rotating shaft (2); A sliding block (72) movably connected with the mounting frame (71) and having a first position and a second position relative to the mounting frame (71); A fuse (73) having two ends respectively connected with the mounting frame (71) and the sliding block (72), and capable of being fused at a preset temperature; A resilient member (74) having two ends respectively connected with the mounting frame (71) and the sliding block (72) and capable of deforming along the length direction of the mounting frame (71); A connecting rod assembly (75) rotationally connected with the sliding block (72) and the mounting frame (71). When the fuse (73) is not fused, the slider (72) is located at a first position, and the linkage assembly (75) is retracted. After the fuse (73) is fused, the elastic member (74) can drive the slider (72) to move to a second position, so that the linkage assembly (75) is unfolded and the valve plate (3) is pressed to the closed state.

9. The check valve of claim 8, wherein The linkage assembly (75) comprises: a first linkage (751), one end of the first linkage (751) is rotationally connected with the mounting frame (71), and the other end extends towards the valve plate (3); a second linkage (752), one end of the second linkage (752) is rotationally connected with the slider (72), and the other end is rotationally connected with the middle part of the first linkage (751), and part of the first linkage (751), the second linkage (752) and part of the mounting frame (71) form a triangle.

10. The check valve of claim 9, wherein The mounting frame (71) is provided with a long hole (711) parallel to the rotating shaft (2), and the locking mechanism (7) further comprises a first hinge shaft (76), the first hinge shaft (76) sequentially penetrates the slider (72) and the long hole (711), the second linkage (752) is hinged with the first hinge shaft (76), and the elastic member (74) is connected with the first hinge shaft (76).

11. The check valve of claim 10, wherein The elastic member (74) is sleeved on the rotating shaft (2).

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