Valve plate and fireproof check valve

Abstract

The present application relates to a valve plate and a fireproof check valve, which solve the problem that a flexible part is easily separated from a metal plate. The valve plate comprises a metal plate and a flexible part, the flexible part is provided with a clamping groove and an abutting surface, the abutting surface is not parallel to the opening direction of the clamping groove, the abutting surface forms a certain angle with the opening direction of the clamping groove, the metal plate can be inserted into the clamping groove, and the abutting surface abuts against the metal plate when the metal plate is inserted into the clamping groove.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve piece and a fireproof check valve. BACKGROUND

[0002] The existing valve piece includes a body, a torsion spring, a connecting rod and a valve piece, the body is provided with an exhaust port, the valve piece includes a metal plate and a flexible piece, the flexible piece is provided with a clamping groove, the flexible piece is sleeved on the peripheral side of the metal plate through the clamping groove, the metal plate is used for opening or closing the exhaust port through the flexible piece, the upper end of the connecting rod is rotationally connected with the valve piece, the lower end of the connecting rod is rotationally connected with the body, the torsion spring is arranged on the connecting rod, one torsion arm of the torsion spring abuts against the body, and the other torsion arm of the torsion spring abuts against the connecting rod, after external gas blows the valve piece to open the exhaust port, the torsion spring exerts a force on the connecting rod, and the connecting rod is driven to rotate around the body, so that the connecting rod closes the exhaust port through the valve piece.

[0003] However, the existing flexible piece is easy to separate from the metal plate. SUMMARY

[0004] The problem to be solved by the present application is to provide a valve piece and a fireproof check valve, and to solve the problem that the flexible piece is easy to separate from the metal plate.

[0005] To solve the above problems, the present application provides the following technical solutions:

[0006] The valve piece includes a metal plate and a flexible piece, the flexible piece is provided with a clamping groove and an abutting surface, the abutting surface is not parallel to the opening direction of the clamping groove, the abutting surface and the opening direction of the clamping groove form a certain angle, and the metal plate can be inserted into the clamping groove.

[0007] In the present application, the valve piece includes a metal plate and a flexible piece, wherein the flexible piece is provided with a clamping groove and an abutting surface. When the metal plate is inserted into the clamping groove, the abutting surface abuts against the metal plate, so as to realize that the flexible piece contacts the metal plate through the abutting surface and the clamping groove respectively. Compared with the prior art that the flexible piece is only sleeved on the metal plate through the clamping groove, in the present application, the contact area between the flexible piece and the metal plate is increased through the abutting surface. After the contact area between the flexible piece and the metal plate is increased, the connection strength between the flexible piece and the metal plate is also adaptively improved. Through the above design, the connection strength between the flexible piece and the metal plate is improved, so as to increase the difficulty of separation between the flexible piece and the metal plate.

[0008] In addition, in the present application, the abutting surface and the opening direction of the clamping groove form a certain angle. When the abutting surface and the opening direction of the clamping groove form a certain angle, the metal plate exerts a force on the flexible piece in two directions. After the flexible piece is subjected to the force of the metal plate in two directions, the flexible piece is difficult to move in the opposite direction of a single force. Through the above design, the difficulty of separation between the flexible piece and the metal plate is further increased.

[0009] Further, the card slot comprises an inner slot wall for abutting the inner wall of the metal plate and an outer slot wall for abutting the outer wall of the metal plate, the flexible piece comprises a mounting portion, at least part of the abutting surface and at least part of the outer slot wall are arranged in the mounting portion, when the metal plate is inserted into the card slot, the metal plate applies a clamping force to the mounting portion.

[0010] When the metal plate applies a clamping force to the mounting portion, the clamping force increases the connection strength of the flexible piece and the metal plate, improves the reliability of the connection of the flexible piece and the metal plate, and increases the position accuracy of the flexible piece on the metal plate.

[0011] Further, the metal plate comprises an inner plate body, a transition plate and an outer plate body, the inner plate body and the outer plate body are connected through the transition plate, the transition plate and the outer plate body are at a certain angle, the flexible piece is a sealing ring, when the sealing ring is sleeved on the metal plate through the card slot, the mounting portion is clamped between the transition plate and the outer plate body.

[0012] Clamping the mounting portion through the transition plate and the outer plate body has the following advantages: 1. The transition plate and the outer plate body are adjacent, which simplifies the clamping structure of the metal plate; 2. Since the transition plate and the outer plate body are adjacent, under the condition that the thickness of the metal plate meets the elastic deformation, the user can change the size of the space between the transition plate and the outer plate body with his hand to change the clamping force of the metal plate applied to the mounting portion.

[0013] Further, the angle between the transition plate and the outer plate body is < 90°, and the width dimension of the transition plate is ≥ the width dimension of the abutting surface.

[0014] In this way, by increasing the contact area between the transition plate and the abutting surface, the contact area between the flexible piece and the metal plate is further improved. In addition, when the width dimension of the transition plate is ≥ the width dimension of the abutting surface, the transition plate located outside the abutting surface increases the distance required for the flexible piece to slide off the metal plate.

[0015] Further, the valve piece further comprises a lower stopper, the lower stopper is arranged on the outer wall of the metal plate, when the lever directly or indirectly closes the exhaust port through the valve piece, the lower stopper is used to prevent the lever from moving reversely relative to the valve body.

[0016] When the lower stopper prevents the lever from moving reversely relative to the valve body, the lever will not be able to move reversely relative to the valve body to achieve the continuous direct or indirect closing of the exhaust port by the lever through the valve piece unit. In this way, the reliability of the lever is ensured to avoid the fireproof check valve losing the fireproof function.

[0017] Further, the metal plate is provided with a mounting groove, the lower stopper is a stop plate, one end of the stop plate is arranged in the mounting groove, the other end of the stop plate is separated from the mounting groove, and at least part of the stop plate is higher than the groove of the mounting groove, the lever can move forward from one end of the stop plate to the other end of the stop plate, in the process of forward movement of the lever along the stop plate, the lever slides in close contact with the stop plate and drives the stop plate to deform and move towards the bottom wall of the mounting groove, after the lever slides forward along the stop plate and is separated from the other end of the stop plate, the stop plate is reset and at least part of the stop plate is higher than the groove of the mounting groove, so as to prevent the lever from moving reversely relative to the valve body. In this way, firstly, the stop plate is deformed elastically to facilitate the sliding of the lever to the specified position (the specified position is the position where the lever cannot move reversely relative to the valve body); and then, the stop plate is restored elastically to prevent the lever from leaving the specified position.

[0018] Further, the valve piece further comprises an upper stopper arranged on the outer wall of the metal plate, and the upper stopper is used to prevent the lever from moving forward relative to the valve body when the lever directly or indirectly closes the exhaust port through the valve piece. In this way, the continuous forward movement of the lever away from the specified position is avoided.

[0019] The fireproof check valve comprises a valve body, a first elastic element, a lever unit and a valve piece unit, the valve body is provided with an exhaust port, the valve piece unit and the lever unit are movably arranged on the valve body, the lever unit and the valve body are further connected through the first elastic element, the lever unit has an unlocking position and a locking position, the first elastic element is used to drive the lever unit to move from the locking position to the unlocking position, so that the lever unit directly or indirectly pushes the valve piece unit to close the exhaust port, and the valve piece unit comprises at least one valve piece according to any one of the technical solutions described above.

[0020] The fireproof check valve further comprises a locking mechanism and a temperature sensing mechanism, the locking mechanism is fixedly connected with the valve body through the temperature sensing mechanism, when the temperature sensing mechanism works, the lever unit is located at the locking position and abuts against the locking mechanism.

[0021] The locking mechanism is slidably connected with the valve body, when the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under the action of gravity or external force and is separated from the lever unit.

[0022] In the present application, the fireproof check valve comprises a locking mechanism and a temperature sensing mechanism, the locking mechanism is fixedly connected with the valve body through the temperature sensing mechanism, when the temperature sensing mechanism works, the lever unit is located at the locking position and abuts against the locking mechanism. In this way, the lever unit cannot directly or indirectly push the valve piece unit to close the exhaust port, so as to ensure that the valve piece unit can open the exhaust port.

[0023] In the present application, the locking mechanism is also in sliding connection with the valve body. When the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under the action of its own gravity or external force and separates from the lever unit. The sliding connection of the locking mechanism with the valve body is used to limit the movement track of the locking mechanism after it separates from the lever unit. When the movement track of the locking mechanism is limited by the valve body, the valve body can further ensure the reliability of the movement stroke of the locking mechanism.

[0024] Since the locking mechanism is in sliding connection with the valve body, when the temperature sensing mechanism stops working, the locking mechanism can also be connected with the valve body. This structure can effectively avoid the problem of loss of the locking mechanism after the temperature sensing mechanism stops working.

[0025] Further, the valve body is provided with a guide rail matched with the locking mechanism. When the temperature sensing mechanism stops working, the locking mechanism slides along the guide rail and separates from the lever unit. The guide rail is used to maintain the stability of the locking mechanism during the sliding process along the valve body. In addition, the guide rail limits the position of the locking mechanism relative to the valve body, which is convenient for connecting with the temperature sensing mechanism.

[0026] Further, the valve body includes a body and a first column, the exhaust port is provided on the body, the first column is fixedly connected with the body, and the guide rail is provided on the first column. When the temperature sensing mechanism works and the locking mechanism is matched with the guide rail, the abutting position of the lever unit and the locking mechanism is located between the exhaust port and the first column. This structure is used to protect the abutting position of the lever unit and the locking mechanism, so as to avoid the abutting position of the lever unit and the locking mechanism from being separated by impact under the action of external force.

[0027] Further, the first column is detachably provided on the body, the temperature sensing mechanism is detachably provided on the first column and / or the body, and the locking mechanism is detachably provided on the temperature sensing mechanism. The detachable first column facilitates replacement of the body, the detachable temperature sensing mechanism facilitates replacement of the temperature sensing mechanism, and the detachable locking mechanism facilitates replacement of the locking mechanism. Such design reduces the maintenance cost and time of the fire check valve, and realizes replacement of parts of the fire check valve on site, especially replacement of the temperature sensing mechanism and the locking mechanism as a whole.

[0028] Further, the lever unit is detachably arranged on the first column, the valve body further comprises a wind deflector fixedly connected with the body; and / or, the valve body further comprises a second column, the valve disc unit is movably arranged on the second column, the second column is detachably arranged on the body, and an accommodation groove for accommodating the second column is arranged on the inner side of the body. When the lever unit is detachably arranged on the first column, the lever unit is convenient to replace, and the accommodation groove on the body does not need to be opened on the valve body to install the lever unit. When the valve disc unit is movably arranged on the second column, the valve disc unit is convenient to replace, and the valve disc unit does not need to be opened on the valve body to install. In addition, the accommodation groove on the inner side of the body is used to change the position of the exhaust port and the valve disc unit, so that the valve disc unit is attached to the body and the exhaust port is closed.

[0029] Further, the locking mechanism is movably connected with the valve body through a second elastic element, when the temperature sensing mechanism stops working, the second elastic element drives the locking mechanism to slide along the guide rail and separates the locking mechanism from the lever unit. The second elastic element provides a driving force for the locking mechanism to separate from the lever unit, and drives the locking mechanism to move in the state that the outer filler component and / or the inner filler component is not completely melted. In this way, the time required for the lever unit to directly or indirectly close the exhaust port through the valve disc unit is shortened.

[0030] The second elastic element provides an auxiliary driving force for the first elastic element to drive the lever to move. In this way, the driving force required for the lever to start rotating is weakened.

[0031] Further, the locking mechanism comprises a locking plate, the locking plate is provided with a clamping groove for abutting against the lever unit and a mounting portion connected with the second elastic element, the second elastic element is a tension spring, and the opening direction of the clamping groove is not perpendicular to the central axis of the tension spring. In this way, the driving force required for the second elastic element to drive the locking plate to move relative to the guide rail is reduced.

[0032] Further, the clamping groove is formed by inwardly recessing a top wall of the locking plate, the side groove wall of the clamping groove is obliquely arranged, and the side groove wall of the clamping groove and the top wall of the locking plate are obliquely transitioned. The side groove wall is used to guide the locking plate to be inserted into the clamping groove. This structure reduces the requirements for manufacturing precision and installation position precision of the locking plate and the lever unit, and also reduces the difficulty of inserting the lever unit into the locking plate.

[0033] Further, the guide rail is a guide channel, the locking mechanism further comprises a guide rod and a mounting plate, the temperature sensing mechanism is arranged on the mounting plate, the guide rod penetrates through the guide channel, the locking plate is arranged at one end of the guide rod close to the valve disc unit, and the mounting plate is arranged at the other end of the guide rod away from the valve disc unit. In this way, the locking mechanism is prevented from being separated from the valve body.

[0034] The fireproof check valve comprises a valve body, a first elastic element, a lever unit and a valve plate unit, the valve body is provided with an exhaust port, the valve plate unit and the lever unit are movably arranged on the valve body, the lever unit and the valve body are connected through the first elastic element, the lever unit has a locking position and an unlocking position, the first elastic element is used for driving the lever unit to move from the locking position to the unlocking position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port, and the valve plate unit comprises at least one valve plate according to any one of the technical solutions.

[0035] The fireproof check valve further comprises a locking mechanism and a temperature sensing mechanism, the locking mechanism is connected with the valve body through the temperature sensing mechanism, when the temperature sensing mechanism works, the lever unit is located at the locking position and abuts against the locking mechanism.

[0036] The locking mechanism is further rotationally connected with the valve body, when the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit, after the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port through the lever unit.

[0037] In the application, the fireproof check valve comprises a locking mechanism and a temperature sensing mechanism, the locking mechanism is fixedly connected with the valve body through the temperature sensing mechanism, when the temperature sensing mechanism works, the lever unit is located at the locking position and abuts against the locking mechanism. In this way, the lever unit cannot directly or indirectly push the valve plate unit to close the exhaust port, so as to ensure that the valve plate unit can open the exhaust port.

[0038] In the application, the locking mechanism is further rotationally connected with the valve body, when the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit, after the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port through the lever unit. The sliding connection between the locking mechanism and the valve body is used for limiting the movement track of the locking mechanism after the locking mechanism separates from the lever unit, when the movement track of the locking mechanism is limited by the valve body, the valve body can further ensure the reliability of the movement stroke of the locking mechanism.

[0039] Since the locking mechanism is rotationally connected with the valve body, when the temperature sensing mechanism stops working, the locking mechanism can also be connected with the valve body. This structure can effectively avoid the problem that the locking mechanism is lost after the temperature sensing mechanism stops working.

[0040] Further, the locking mechanism is detachably arranged on the temperature sensing mechanism, and / or the temperature sensing mechanism is detachably arranged on the valve body. The detachable temperature sensing mechanism facilitates replacement of the temperature sensing mechanism, and the detachable locking mechanism facilitates replacement of the locking mechanism. In this way, the maintenance cost and time of the fireproof check valve are reduced, and the fireproof check valve can be replaced with components on site, especially the temperature sensing mechanism and the locking mechanism.

[0041] Further, the fireproof check valve further comprises a limiting mechanism, the locking mechanism is provided with a matching portion matched with the limiting mechanism, and in the process that the first elastic element pushes the locking mechanism to rotate around the valve body through the push rod unit, the limiting mechanism limits the rotation range of the locking mechanism relative to the valve body through the matching portion. In this way, the limiting mechanism preliminarily positions the locking mechanism on the valve body to facilitate subsequent installation of the temperature sensing mechanism.

[0042] Further, the limiting mechanism comprises a limiting rod, the limiting rod is arranged on the valve body, the shaft center of the rotating connection between the locking mechanism and the valve body is not parallel to the shaft center of the limiting rod, the locking mechanism is provided with a through hole, the through hole is the matching portion, the diameter of the through hole is greater than the diameter of the limiting rod, the limiting rod penetrates through the through hole, and in the process that the first elastic element pushes the locking mechanism to rotate around the valve body through the push rod unit, the limiting rod limits the rotation range of the locking mechanism relative to the valve body through the through hole. In this way, the structure of the limiting mechanism is simplified, and the matching structure of the locking mechanism and the limiting mechanism is simplified.

[0043] Further, the valve body comprises a body and a mounting seat, the mounting seat is arranged on the body, and the temperature sensing mechanism and the limiting mechanism are detachably arranged on the mounting seat; or the valve body comprises a body and a mounting seat, and the mounting seat is arranged on the body through the temperature sensing mechanism or the limiting mechanism. In this way, the influence of replacement of the temperature sensing mechanism and the limiting mechanism on the body is reduced.

[0044] Further, the locking mechanism comprises a locking plate, the locking plate is sequentially provided with a switching portion, a connecting portion, a matching portion and an abutting block from inside to outside, the locking plate is rotationally connected with the valve body through the switching portion, the locking plate is connected with the temperature sensing mechanism through the connecting portion, and the locking plate abuts against the push rod unit through the abutting block. In this way, without changing the size of the locking plate, the interval distance between the switching portion and the matching portion is increased to improve the rotation range of the locking plate.

[0045] Further, the valve piece unit comprises at least one valve piece, each valve piece comprises a metal plate and a flexible ring, and the metal plate is circumferentially provided with a bending portion, and the flexible ring is sleeved on the bending portion. In this way, the difficulty of falling of the flexible ring from the metal plate is increased.

[0046] Further, the valve plate unit and the lever unit are respectively connected with the valve body, and the connection position of the valve plate unit with the valve body is below the connection position of the lever unit with the valve body. By raising the lever unit to close the valve plate unit, the interval between the connection position of the valve plate unit with the valve body and the connection position of the lever unit with the valve body is increased. In this way, the force of the valve plate to close the exhaust port is effectively improved.

[0047] Further, the fireproof check valve further comprises a wind guide cover, which is fixedly connected with the valve body and forms a wind guide channel after being fixedly connected with the valve body, and the cross-sectional area of the lower end of the wind guide channel is smaller than that of the upper end of the wind guide channel.

[0048] Further, the temperature sensing mechanism comprises an outer fuse assembly and an inner fuse assembly, the locking mechanism is arranged in the inner fuse assembly, and the outer fuse assembly is arranged on the outer wall of the valve body. When the outer fuse assembly is arranged on the outer wall of the valve body, the outer fuse assembly penetrates the valve body and is connected with the inner fuse assembly. In this way, when one of the outer fuse assembly and the inner fuse assembly is heated, the temperature sensing mechanism can start to work.

[0049] Alternatively, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body, and the inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body. The connecting piece has strong deformation resistance, effectively reduces the probability of separation of the outer fuse assembly and the inner fuse assembly at room temperature, the outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body, which can effectively shorten the installation time of the outer fuse assembly and reduce the installation difficulty of the outer fuse assembly, and the inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body, which can effectively shorten the installation time of the inner fuse assembly and reduce the installation difficulty of the inner fuse assembly.

[0050] Or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body, and the locking mechanism is connected with the connecting piece through the inner fuse assembly; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the connecting piece is connected with the outer fuse assembly and the outer wall of the valve body, and the inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the connecting piece is connected with the outer fuse assembly and the outer wall of the valve body, and the locking mechanism is connected with the connecting piece through the inner fuse assembly. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is a perspective view of the fireproof check valve in the second embodiment of the present application;

[0052] Figure 2 It is a perspective view of the fireproof check valve in the second embodiment of the present application (omitting the valve plate unit);

[0053] Figure 3 It is a first perspective view of the push rod unit, the locking mechanism and the temperature sensing mechanism in the second embodiment of the present application;

[0054] Figure 4 It is a second perspective view of the push rod unit, the locking mechanism and the temperature sensing mechanism in the second embodiment of the present application;

[0055] Figure 5 It is a perspective view of the locking mechanism and the temperature sensing mechanism in the second embodiment of the present application;

[0056] Figure 6 It is a rear view of the locking mechanism and the temperature sensing mechanism in the second embodiment of the present application;

[0057] Figure 7 It is a perspective view of Figure 6 the sectional view at A-A;

[0058] Figure 8 It is a perspective view of the first column in the second embodiment of the present application;

[0059] Figure 9 It is a perspective view of the metal plate in the first embodiment of the present application;

[0060] Figure 10 It is a perspective view of the flexible piece in the first embodiment of the present application;

[0061] Figure 11 It is a perspective view of Figure 10 the sectional view at B-B;

[0062] Figure 12A sectional view of a part of the valve plate in the embodiment of the present application. DETAILED DESCRIPTION

[0063] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. The following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0064] Embodiment one

[0065] Referring to Figure 10 , Figure 11 and Figure 12 , the valve plate 2 comprises a metal plate 21 and a flexible piece 22, the flexible piece 22 is provided with a clamping groove 221 and an abutting surface 222, the abutting surface 222 is not parallel to the opening direction of the clamping groove 221 (the opening direction of the clamping groove 221 is indicated by the arrow with text in the figure), and the abutting surface 222 is at a certain angle with the opening direction of the clamping groove 221. Figure 11 In the figure, the angle between the abutting surface 222 and the opening direction of the clamping groove 221 is a, the metal plate 21 can be inserted into the clamping groove 221, and when the metal plate 21 is inserted into the clamping groove 221, the abutting surface 222 abuts against the metal plate 21. Figure 11

[0066] Referring to Figure 12 , the clamping groove 221 comprises an inner groove wall 2212 for abutting against the inner wall of the metal plate 21 and an outer groove wall 2211 for abutting against the outer wall of the metal plate 21, and the flexible piece 22 comprises a mounting portion 220, at least part of the abutting surface 222 and at least part of the outer groove wall 2211 are arranged in the mounting portion 220, and when the metal plate 21 is inserted into the clamping groove 221, the metal plate 21 exerts a clamping force on the mounting portion 220.

[0067] Referring to Figure 9 , the metal plate 21 comprises an inner plate body 211, a transition plate 212 and an outer plate body 213, the inner plate body 211 is connected with the outer plate body 213 through the transition plate 212, and the transition plate 212 is at a certain angle with the outer plate body 213. Figure 12 As can be seen from the figure, the angle between the transition plate 212 and the outer plate body 213 is b, the flexible piece 22 is a sealing ring, and when the sealing ring is sleeved on the metal plate 21 through the clamping groove 221, the mounting portion 220 is clamped between the transition plate 212 and the outer plate body 213.

[0068] Preferably, the included angle between the transition plate 212 and the outer plate body 213 is < 90°, i.e. b < 90°, and the width dimension of the transition plate 212 is ≥ the width dimension of the abutting surface 222, such as Figure 12 ​The angle between the transition plate 212 and the outer plate body 213 is > 90°, and the width dimension of the transition plate is < the width dimension of the abutting surface.

[0069] Referring to Figure 12 , the valve plate 2 further comprises a lower stopper 23 arranged on the outer wall of the metal plate 21, which is used to prevent the reverse movement of the lever relative to the valve body when the lever directly or indirectly closes the exhaust port through the valve plate 2.

[0070] Preferably, the metal plate 21 is provided with a mounting groove 2111, and the lower stopper 23 is a stop plate, one end of which is arranged in the mounting groove 2111, and the other end of which is separated from the mounting groove 2111 and at least part of the stop plate is higher than the groove of the mounting groove 2111. The lever can be positively moved from one end of the stop plate to the other end of the stop plate. During the positive movement of the lever along the stop plate, the lever slides along the stop plate and drives the stop plate to move towards the bottom wall of the mounting groove 2111. After the lever slides along the stop plate and separates from the other end of the stop plate, the stop plate returns and at least part of the stop plate is higher than the groove of the mounting groove 2111, so as to prevent the reverse movement of the lever relative to the valve body.

[0071] Referring to Figure 12 , the valve plate 2 further comprises an upper stopper 24 arranged on the outer wall of the metal plate 21, which is used to prevent the positive movement of the lever relative to the valve body when the lever directly or indirectly closes the exhaust port through the valve plate 22.

[0072] Embodiment Two

[0073] This embodiment introduces a fireproof check valve, and the valve plate 2 in Embodiment One can be used in the fireproof check valve described in this embodiment.

[0074] The valve plate 2 in Embodiment One can be used in the fireproof check valve described in this embodiment, that is, in this embodiment, the valve plate unit comprises at least one valve plate described in Embodiment One.

[0075] Referring to Figure 1 and Figure 2 , the fireproof check valve comprises a valve body 1, a first elastic element (not labeled), a lever unit 3 and a valve plate unit, the valve body 1 is provided with an exhaust port 111, the valve plate unit and the lever unit 3 are movably arranged on the valve body 1, and the lever unit 3 is further connected with the valve body 1 through the first elastic element. The lever unit 3 has a locked position (as shown in Figure 1 and Figure 2 , the position of the lever unit 3 is the locked position) and an unlocked position, and the first elastic element is used to drive the lever unit 3 to move from the locked position to the unlocked position, so that the lever unit 3 directly or indirectly pushes the valve plate unit to close the exhaust port 111.

[0076] The fireproof check valve further comprises a third elastic element, the valve piece unit comprises at least one valve piece 2, but the number of valve pieces can be changed according to actual needs, in the embodiment, the valve piece unit comprises two valve pieces 2, each valve piece 2 is rotationally connected with the valve body 1, the exhaust port 111 comprises two small exhaust ports, each valve piece 2 is further connected with the valve body 1 through the third elastic element, in a normal temperature environment, the range hood drives the valve piece to rotate relative to the valve body 1 to open the small exhaust port, and the third elastic element drives the valve piece to rotate relative to the valve body 1 to close the small exhaust port. In other embodiments of the present application, the valve piece can also rotate relative to the valve body to close the small exhaust port under the action of gravity; or, the valve piece is rotationally connected with one end of a connecting rod, the other end of the connecting rod is rotationally connected with the valve body, the connecting rod rotates relative to the valve body to drive the valve piece to close the small exhaust port, and the lever unit indirectly pushes the valve piece unit to close the exhaust port through the connecting rod.

[0077] In the embodiment, the lever unit 3 comprises two levers, each lever directly closes the small exhaust port 111 by pushing one valve piece, the number of levers is preferably the same as the number of valve pieces, of course, in certain cases, the number of levers can also be more or less than the number of valve pieces.

[0078] In the embodiment, the lever is rotationally connected with the valve body 1. In other embodiments of the present application, the lever can also be slidingly connected with the valve body.

[0079] In addition, in other embodiments of the present application, the number of valve pieces comprised by the valve piece unit is not limited to two, the valve piece unit can also contain one valve piece, three valve pieces, four valve pieces, six valve pieces, nine valve pieces, etc. Similarly, in other embodiments of the present application, the number of levers comprised by the lever unit is not limited to two, the lever unit can also contain one lever, three levers, four levers, six levers, nine levers, etc.

[0080] Preferably, the first elastic element is a first torsion spring, the first torsion spring is sleeved on the lever, one torsion arm of the first torsion spring is connected with the valve body 1, and the other torsion arm of the first torsion spring is connected with the lever. In other embodiments of the present application, the first elastic element can be a first tension spring or a first compression spring.

[0081] Preferably, the third elastic element is a third torsion spring, the third torsion spring is sleeved on the valve piece, one torsion arm of the third torsion spring is connected with the valve body 1, and the other torsion arm of the third torsion spring is connected with the valve piece. In other embodiments of the present application, the third elastic element can be a third tension spring or a third compression spring.

[0082] Referring to Figure 2 and Figure 3 The difference from the prior art is that the fireproof check valve of the present application further comprises a locking mechanism 4 and a temperature sensing mechanism 5, the locking mechanism 4 is fixedly connected with the valve body 1 through the temperature sensing mechanism 5, when the temperature sensing mechanism 5 works, the lever unit 3 is located at the locking position and abuts against the locking mechanism 4.

[0083] The locking mechanism 4 is in sliding connection with the valve body 1, and when the temperature sensing mechanism 5 stops working, the locking mechanism 4 slides along the valve body 1 under the action of gravity or external force and separates from the lever unit 3.

[0084] Referring to Figure 1 and Figure 8 , the valve body 1 is provided with a guide rail 121 matched with the locking mechanism 4, and when the temperature sensing mechanism 5 stops working, the locking mechanism 4 slides along the guide rail 121 and separates from the lever unit 3.

[0085] In this embodiment, the valve body 1 comprises a body 11 and a first column 12, the exhaust port 111 is arranged on the body 11, the first column 12 is fixedly connected with the body 11, and the guide rail 121 is arranged on the first column 12. When the temperature sensing mechanism 5 works and the locking mechanism 4 matches with the guide rail 121, the abutting position of the lever unit 3 and the locking mechanism 4 is located between the exhaust port 111 and the first column 12.

[0086] Preferably, the first column 12 is detachably arranged on the body 11, the temperature sensing mechanism 5 is detachably arranged on the first column 12 and / or the body 11, and the locking mechanism 4 is detachably arranged on the temperature sensing mechanism 5. In other embodiments of the present application, the first column is fixedly connected with the body; or, the temperature sensing mechanism is fixedly connected with the first column and the body; or, the temperature sensing mechanism is fixedly connected with the first column; or, the temperature sensing mechanism is fixedly connected with the body; or, the locking mechanism is fixedly connected with the temperature sensing mechanism.

[0087] Preferably, the first column 12 is provided with a mounting plate 123 for connecting the second elastic element 6. This structure facilitates the overall disassembly of the locking mechanism 4 and the temperature sensing mechanism 5. In other embodiments of the present application, the second elastic element can also be connected with the body.

[0088] Referring to Figure 1 and Figure 2 , the lever unit 3 is detachably arranged on the first column 12, and the valve body 1 further comprises a wind deflector fixedly connected with the body 11; the valve body 1 further comprises a second column 13, the valve plate unit is movably arranged on the second column 13, the second column 13 is detachably arranged on the body 11, and the inner side of the body 11 is provided with a receiving groove for receiving the second column 13. In other embodiments of the present application, the lever unit is detachably arranged on the first column, and the valve body further comprises a wind deflector fixedly connected with the body; or, the valve body further comprises a second column, the valve plate unit is movably arranged on the second column, the second column is detachably arranged on the body, and the inner side of the body is provided with a receiving groove for receiving the second column.

[0089] Referring to Figure 2 , Figure 5 and Figure 8The fireproof check valve further comprises a second elastic element 6, the locking mechanism 4 is movably connected with the valve body 1 through the second elastic element 6, when the temperature sensing mechanism 5 stops working, the second elastic element 6 drives the locking mechanism 4 to slide along the guide rail 121, and the locking mechanism 4 is separated from the lever unit 3.

[0090] Referring to Figure 5 The locking mechanism 4 comprises a locking plate 41, the locking plate 41 is provided with a clamping groove 411 for abutting against the lever unit 3 and a mounting portion 412 connected with the second elastic element 6, the second elastic element is a second tension spring, and the opening direction of the clamping groove is not perpendicular to the central axis of the second tension spring. In other embodiments of the present application, the second elastic element can also be a second compression spring or a second torsion spring; or, the locking plate is provided with an abutting plate for abutting against the lever unit.

[0091] Referring to Figure 4 and Figure 6 The clamping groove 411 is formed by inwardly recessing a top wall 4112 of the locking plate 41, the side groove wall 4111 of the clamping groove 411 is obliquely arranged, and the side groove wall 4111 of the clamping groove 411 and the top wall 4112 of the locking plate 41 are obliquely transitioned.

[0092] In the embodiment, the clamping groove 411 comprises a bottom groove wall 4113 and the side groove wall 4111, and the lever unit 3 is inserted into the clamping groove 411 and abuts against the bottom groove wall 4113 and / or the side groove wall 4111.

[0093] Preferably, the mounting portion 412 is higher than the bottom groove wall 4113, and the mounting portion 412 is formed by outwardly extending from the bottom groove wall 4113. The mounting portion 412 can also prevent the lever unit 3 from shaking in the clamping groove 411 to some extent.

[0094] Referring to Figure 6 , Figure 7 and Figure 8 The guide rail 121 is a guide channel, the locking mechanism 4 further comprises a guide rod 42 and a mounting plate 43, the temperature sensing mechanism 5 is arranged on the mounting plate 43, the guide rod 42 penetrates through the guide channel, the locking plate 41 is arranged at one end of the guide rod 43 close to the valve plate unit, and the mounting plate 43 is arranged at the other end of the guide rod 42 away from the valve plate unit. In other embodiments of the present application, the guide rail can also be one of a guide groove and a guide protrusion; or, in the case that the locking mechanism only comprises the locking plate, the temperature sensing mechanism is fixedly connected with the locking plate.

[0095] Referring to Figure 2 , Figure 6 and Figure 7The temperature sensing mechanism 5 comprises an outer fuse assembly 52 and an inner fuse assembly 51, the locking mechanism 4 is arranged on the inner fuse assembly 51, and the outer fuse assembly 52 is arranged on the outer wall of the valve body 1. When the outer fuse assembly 52 is arranged on the outer wall of the valve body 1, the outer fuse assembly 52 penetrates the valve body 1 and is connected with the inner fuse assembly 51. Specifically, the inner fuse assembly 51 comprises an inner solder ring, the outer fuse assembly 52 comprises a metal sleeve 521, an outer solder ring 522 and a plug-in rod 523, the outer solder ring 522 and the plug-in rod 523 are inserted into the metal sleeve 521, the metal sleeve 521 is fixedly connected with the valve body 1, when the metal sleeve 521 is fixedly connected with the valve body 1, the outer end of the outer solder ring 522 abuts against the inner wall of the metal sleeve 521, the inner end of the outer solder ring 522 abuts against the outer end of the plug-in rod 523, the inner end of the plug-in rod 523 penetrates the valve body 1 and is inserted into the inner solder ring, and the locking mechanism 4 is fixedly connected with the inner solder ring. When the outdoor temperature is high, the outer solder ring 522 melts, which means that the temperature sensing mechanism 5 stops working, the plug-in rod 523 is separated from the inner solder ring under the action of its own gravity, and the second elastic element 6 drives the locking mechanism 4 to be separated from the lever unit 3 when the inner solder ring loses the constraint of the plug-in rod 523 and has a certain gap with the inner wall of the valve body 1. When the indoor temperature is high, the inner solder ring melts, which means that the temperature sensing mechanism 5 stops working, and the locking mechanism 4 loses the constraint of the temperature sensing mechanism 5 after the inner solder ring melts, so that the second elastic element 6 drives the locking mechanism 4 to be separated from the lever unit 3.

[0096] In the embodiment, when the inner solder ring and / or the outer solder ring 522 is not melted, the temperature sensing mechanism 5 is in a working state.

[0097] In other embodiments of the present application, the temperature sensing mechanism comprises an outer fuse assembly and an inner fuse assembly, the locking mechanism is arranged on the inner fuse assembly, and the outer fuse assembly is arranged on the outer wall of the valve body. When the outer fuse assembly is arranged on the outer wall of the valve body, the inner fuse assembly penetrates through the valve body and is connected with the outer fuse assembly. Alternatively, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece. The connecting piece penetrates through the valve body. The outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body. The inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body. Alternatively, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece. The connecting piece penetrates through the valve body. The outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body. The locking mechanism is connected with the connecting piece through the inner fuse assembly. Alternatively, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece. The connecting piece penetrates through the valve body. The connecting piece is connected with the outer fuse assembly and the outer wall of the valve body. The inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body. Alternatively, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece. The connecting piece penetrates through the valve body. The connecting piece is connected with the outer fuse assembly and the outer wall of the valve body. The locking mechanism is connected with the connecting piece through the inner fuse assembly.

[0098] Embodiment Two

[0099] The fireproof check valve of the present embodiment is different from the fireproof check valve of Embodiment Two. In the present embodiment, the locking mechanism and the temperature sensing mechanism are improved.

[0100] The valve piece 2 of Embodiment One can be used in the fireproof check valve of the present embodiment. That is, in the present embodiment, the valve piece unit comprises at least one valve piece 2 of Embodiment One.

[0101] In the present embodiment, the fireproof check valve comprises a valve body, a first elastic element, a lever unit and a valve piece unit. The valve body is provided with an exhaust port. The valve piece unit and the lever unit are movably arranged on the valve body. The lever unit and the valve body are further connected through the first elastic element. The lever unit has a locking position and an unlocking position. The first elastic element is used to drive the lever unit to move from the locking position to the unlocking position, so as to directly or indirectly push the valve piece unit to close the exhaust port.

[0102] In the embodiment, the fireproof check valve further comprises a second elastic element, the valve piece unit comprises one valve piece, the valve piece is rotationally connected with the valve body, and the valve piece is further connected with the valve body through the second elastic element. In a normal temperature environment, the range hood drives the valve piece to rotate relative to the valve body to open the exhaust port, and the second elastic element drives the valve piece to rotate relative to the valve body to close the exhaust port. In other embodiments of the present application, the valve piece can also rotate relative to the valve body under the action of gravity to close the exhaust port; or, the valve piece is rotationally connected with one end of a connecting rod, the other end of the connecting rod is rotationally connected with the valve body, and the connecting rod rotates relative to the valve body to drive the valve piece to close the exhaust port, and the lever unit indirectly drives the valve piece unit to close the exhaust port through the connecting rod.

[0103] In the embodiment, the lever unit comprises one lever, the lever directly drives the valve piece to close the exhaust port, and the number of the levers is preferably the same as that of the valve pieces. Of course, in certain cases, the number of the levers can also be more or less than that of the valve pieces.

[0104] In the embodiment, the lever is rotationally connected with the valve body. In other embodiments of the present application, the lever can also be slidingly connected with the valve body.

[0105] In addition, in other embodiments of the present application, the number of valve pieces comprised by the valve piece unit is not limited to one, and the valve piece unit can also comprise two valve pieces, three valve pieces, four valve pieces, six valve pieces, nine valve pieces, etc. Similarly, in other embodiments of the present application, the number of levers comprised by the lever unit is not limited to one, and the lever unit can also comprise two levers, three levers, four levers, six levers, nine levers, etc.

[0106] Preferably, the first elastic element is a first torsion spring, the first torsion spring is sleeved on the lever, one torsion arm of the first torsion spring is connected with the valve body 1, and the other torsion arm of the first torsion spring is connected with the lever. In other embodiments of the present application, the first elastic element can be a first tension spring or a first compression spring.

[0107] Preferably, the second elastic element is a second torsion spring, the second torsion spring is sleeved on the valve piece, one torsion arm of the second torsion spring is connected with the valve body 1, and the other torsion arm of the second torsion spring is connected with the valve piece. In other embodiments of the present application, the second elastic element can be a second tension spring or a second compression spring.

[0108] In the embodiment, the fireproof check valve further comprises a locking mechanism and a temperature sensing mechanism, the locking mechanism is connected with the valve body through the temperature sensing mechanism, when the temperature sensing mechanism works, the lever unit is located at the locking position and abuts against the locking mechanism.

[0109] The locking mechanism is also rotationally connected with the valve body, when the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit, after the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve piece unit to close the exhaust port.

[0110] In the embodiment, the locking mechanism is detachably arranged on the temperature sensing mechanism, and / or the temperature sensing mechanism is detachably arranged on the valve body.

[0111] In the embodiment, the fireproof check valve further comprises a limiting mechanism, the locking mechanism is provided with a matching part matched with the limiting mechanism, and the limiting mechanism limits the rotation range of the locking mechanism relative to the valve body through the matching part in the process that the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit.

[0112] In the embodiment, the limiting mechanism comprises a limiting rod, the limiting rod is arranged on the valve body, the shaft center of the rotation connection part of the locking mechanism and the valve body is not parallel to the shaft center of the limiting rod, the locking mechanism is provided with a through hole, the through hole is the matching part, the diameter of the through hole is greater than the diameter of the limiting rod, the limiting rod penetrates through the through hole, and the limiting rod limits the rotation range of the locking mechanism relative to the valve body through the through hole in the process that the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit. In other embodiments of the present application, the limiting mechanism comprises an arc-shaped groove, and the locking mechanism is provided with a protrusion matched with the arc-shaped groove.

[0113] Preferably, the through hole is a rectangular hole, and the limiting rod is a circular rod.

[0114] In the embodiment, the valve body comprises a main body and a mounting seat, the mounting seat is arranged on the main body, and the temperature sensing mechanism and the limiting mechanism are detachably arranged on the mounting seat. In other embodiments of the present application, the valve body comprises a main body and a mounting seat, and the mounting seat is arranged on the main body through the temperature sensing mechanism or the limiting mechanism.

[0115] In the embodiment, the locking mechanism comprises a locking plate, the locking plate is sequentially provided with a switching part, a connecting part, a matching part and an abutting block from inside to outside, the locking plate is rotationally connected with the valve body through the switching part, the locking plate is connected with the temperature sensing mechanism through the connecting part, and the locking plate abuts against the lever unit through the abutting block. In other embodiments of the present application, the position relationship of the switching part, the connecting part, the matching part and the abutting block on the locking plate can be changed.

[0116] In addition, in other embodiments of the present application, the switching part, the connecting part, the matching part and the abutting block can also be arranged on different components of the locking mechanism, and the different components are assembled to form the locking mechanism.

[0117] In the embodiment, the valve piece unit comprises at least one valve piece, the valve piece comprises a metal plate and a flexible ring, the metal plate is circumferentially provided with a bending part, and the flexible ring is sleeved on the bending part.

[0118] In the embodiment, the valve plate unit and the lever unit are respectively rotationally connected with the valve body, and the rotational connection position of the valve plate unit with the valve body is below the rotational connection position of the lever unit with the valve body.

[0119] Preferably, the fireproof check valve further comprises a wind deflector, the wind deflector is fixedly connected with the valve body, and a wind deflection channel is formed after the wind deflector is fixedly connected with the valve body, the cross-sectional area of the lower end of the wind deflection channel is smaller than that of the upper end of the wind deflection channel.

[0120] In the embodiment, the temperature sensing mechanism comprises an outer fuse assembly and an inner fuse assembly, the locking mechanism is arranged on the inner fuse assembly, and the outer fuse assembly is arranged on the outer wall of the valve body. When the outer fuse assembly is arranged on the outer wall of the valve body, the outer fuse assembly penetrates through the valve body and is connected with the inner fuse assembly. Specifically, the inner fuse assembly comprises an inner solder ring, the outer fuse assembly comprises a metal sleeve, an outer solder ring and a plug-in rod, the outer solder ring and the plug-in rod are inserted into the metal sleeve, the metal sleeve is fixedly connected with the valve body, the outer end of the outer solder ring abuts against the inner wall of the metal sleeve when the metal sleeve is fixedly connected with the valve body, the inner end of the outer solder ring abuts against the outer end of the plug-in rod, the inner end of the plug-in rod penetrates through the valve body and is inserted into the inner solder ring, and the locking mechanism is fixedly connected with the inner solder ring. When the outdoor temperature is high, the outer solder ring melts, which means that the temperature sensing mechanism stops working. Under the action of the gravity of the plug-in rod, the plug-in rod is separated from the inner solder ring. In the case that the inner solder ring loses the constraint of the plug-in rod and has a certain gap with the inner wall of the valve body, the second elastic element drives the locking mechanism to be separated from the lever unit. When the indoor temperature is high, the inner solder ring melts, which means that the temperature sensing mechanism stops working. After the inner solder ring melts, the locking mechanism loses the constraint of the temperature sensing mechanism, and the second elastic element drives the locking mechanism to be separated from the lever unit.

[0121] In the embodiment, when the inner solder ring and / or the outer solder ring is not melted, the temperature sensing mechanism is in a working state.

[0122] In other embodiments of the present application, the temperature sensing mechanism comprises an outer fuse assembly and an inner fuse assembly, the locking mechanism is arranged in the inner fuse assembly, the outer fuse assembly is arranged on the outer wall of the valve body, when the outer fuse assembly is arranged on the outer wall of the valve body, the inner fuse assembly penetrates the valve body and is connected with the outer fuse assembly; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body, the inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the outer fuse assembly is clamped between the connecting piece and the outer wall of the valve body, the locking mechanism is connected with the connecting piece through the inner fuse assembly; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the connecting piece is connected with the outer fuse assembly and the outer wall of the valve body, the inner fuse assembly is clamped between the connecting piece and the inner wall of the valve body; or, the temperature sensing mechanism comprises an outer fuse assembly, an inner fuse assembly and a connecting piece, the connecting piece penetrates the valve body, the connecting piece is connected with the outer fuse assembly and the outer wall of the valve body, the locking mechanism is connected with the connecting piece through the inner fuse assembly.

[0123] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiment. Any modification which does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A valve plate, comprising a metal plate and a flexible component, characterized in that, The flexible component is provided with a slot and an abutting surface. The abutting surface is not parallel to the opening direction of the slot. The abutting surface forms a certain angle with the opening direction of the slot, where the angle is α, and α < 90°. The metal plate can be inserted into the slot. When the metal plate is inserted into the slot, the abutting surface abuts against the metal plate, and the slot contacts the metal plate. The flexible component includes a mounting section; The metal plate includes an inner plate, a transition plate, and an outer plate. The inner plate and the outer plate are connected by the transition plate, and the transition plate and the outer plate are at a certain angle. The flexible component is a sealing ring. When the sealing ring is sleeved on the metal plate through the slot, the mounting part is clamped between the transition plate and the outer plate.

2. The valve plate as described in claim 1, characterized in that, The slot includes an inner groove wall for abutting against the inner wall of the metal plate and an outer groove wall for abutting against the outer wall of the metal plate. At least a portion of the abutting surface and at least a portion of the outer groove wall are disposed in the mounting portion. When the metal plate is inserted into the slot, the metal plate applies a clamping force to the mounting portion.

3. The valve plate as described in claim 1, characterized in that, The angle between the transition plate and the outer plate is less than 90°, and the width of the transition plate is greater than or equal to the width of the contact surface.

4. The valve plate as described in claim 1, characterized in that, The valve plate also includes a lower stop, which is located on the outer wall of the metal plate. When the lever directly or indirectly closes the exhaust port through the valve plate, the lower stop is used to prevent the lever from moving in the opposite direction relative to the valve body.

5. The valve plate as described in claim 4, characterized in that, The metal plate is provided with a mounting groove, and the lower stop is a stop plate. One end of the stop plate is located in the mounting groove, and the other end of the stop plate is separated from the mounting groove. At least part of the stop plate is higher than the opening of the mounting groove. The lever can move forward from one end of the stop plate to the other end of the stop plate. During the forward movement of the lever along the stop plate, the lever slides against the stop plate and drives the stop plate to deform and move towards the bottom wall of the mounting groove. After the lever slides forward along the stop plate and separates from the other end of the stop plate, the stop plate returns to its original position and at least part of the stop plate is higher than the opening of the mounting groove to prevent the lever from moving in the opposite direction relative to the valve body.

6. The valve plate as described in claim 1, characterized in that, The valve plate also includes an upper stop, which is located on the outer wall of the metal plate. When the lever directly or indirectly closes the exhaust port through the valve plate, the upper stop is used to prevent the lever from moving forward relative to the valve body.

7. A fireproof check valve, comprising a valve body, a first elastic element, a lever unit, and a valve plate unit, wherein the valve body has an exhaust port, the valve plate unit and the lever unit are movably disposed on the valve body, the lever unit is also connected to the valve body via the first elastic element, the lever unit has an unlocked position and a locked position, the first elastic element is used to drive the lever unit from the locked position to the unlocked position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port, characterized in that... The valve plate unit includes at least one valve plate as described in any one of claims 1 to 6; The fireproof check valve also includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is fixedly connected to the valve body through the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is located in the locking position and abuts against the locking mechanism. The locking mechanism is slidably connected to the valve body. When the temperature sensing mechanism stops working, the locking mechanism slides along the valve body under its own weight or external force and separates from the lever unit.

8. The fireproof check valve as described in claim 7, characterized in that, The valve body is provided with a guide rail that cooperates with the locking mechanism. When the temperature sensing mechanism stops working, the locking mechanism slides along the guide rail and separates from the lever unit; or, the fireproof check valve further includes a second elastic element. The locking mechanism is movably connected to the valve body through the second elastic element. When the temperature sensing mechanism stops working, the second elastic element drives the locking mechanism to slide along the guide rail and separates the locking mechanism from the lever unit.

9. A fireproof check valve, comprising a valve body, a first elastic element, a lever unit, and a valve plate unit, wherein the valve body has an exhaust port, the valve plate unit and the lever unit are movably disposed on the valve body, the lever unit is also connected to the valve body via the first elastic element, the lever unit has a locked position and an unlocked position, the first elastic element is used to drive the lever unit from the locked position to the unlocked position, so that the lever unit directly or indirectly pushes the valve plate unit to close the exhaust port, characterized in that... The valve plate unit includes at least one valve plate as described in any one of claims 1 to 6; The fireproof check valve also includes a locking mechanism and a temperature sensing mechanism. The locking mechanism is connected to the valve body through the temperature sensing mechanism. When the temperature sensing mechanism is working, the lever unit is in the locking position and abuts against the locking mechanism. The locking mechanism is also rotatably connected to the valve body. When the temperature sensing mechanism stops working, the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit. After the first elastic element pushes the locking mechanism to rotate around the valve body through the lever unit and separates from the locking mechanism, the first elastic element directly or indirectly pushes the valve plate unit to close the exhaust port through the lever unit.

Images