CN219221288U - Fireproof check valve - Google Patents

Abstract

The utility model discloses a fireproof check valve, which comprises a valve body and a valve plate, wherein the valve plate is rotatably arranged in the valve body through a rotating shaft and can rotate relative to the valve body; the fireproof check valve further comprises a fireproof structure, wherein the fireproof structure comprises a buckling rod, a fuse link and a first elastic piece; when the check valve works normally, the buckling rod is limited by the fuse link to separate from the valve plate, and in a flue fire state, the buckling rod is separated from the fuse link and presses the valve plate under the action of the first elastic piece to close the check valve; the check valve further comprises a driving assembly, the driving assembly comprises a driving mechanism used for driving the valve plate to rotate, the output end of the driving mechanism is connected with the rotating shaft through a fastener, and the fastener can be separated from the output end of the driving mechanism and the rotating shaft under the fire state of the flue, so that the output end of the driving mechanism is disconnected from the rotating shaft.

Description

Fireproof check valve

Technical Field

The utility model relates to a check valve, in particular to a fireproof check valve.

Background

In a kitchen using a longitudinal public flue, in order to prevent the oil smoke in the flue from flowing back into the kitchen, a device such as a flue check valve is arranged between the outlet pipe orifice of the range hood and the public flue. The existing flue check valve generally comprises a lampblack channel formed by a shell, the lampblack channel is provided with an air inlet and an air outlet which are opposite, the air inlet is connected with an air outlet pipe orifice of a smoke exhaust ventilator, the air outlet extends into a public flue, a valve plate capable of being opened and closed is arranged at the air outlet of the lampblack channel, and the valve plate is rotatably arranged on the inner wall of the lampblack channel through a valve plate rotating shaft which is horizontally arranged. Because a plurality of users use one longitudinal public flue gas channel, once one user fires, a large amount of high-temperature harmful gas flows into the longitudinal public flue gas channel, and if the valve plate in the flue check valve is not closed in time at the moment, the large amount of high-temperature harmful gas can enter the user home using the range hood through the oil smoke channel of the flue check valve, thereby threatening the life safety of the householder.

For this purpose, there are known check valves capable of realizing fire protection, such as the single-valve-plate and double-valve-plate fire protection check valves disclosed in the chinese patent application No. 201710968107.9 and 201711086467.2 of the applicant. When the existing check valve is not used, the valve plate is in a closed position due to self gravity or spring pressure, and the valve plate covers the air outlet part; when the range hood is used, the valve plate is in an open position and is far away from the air outlet. The sealing is carried out by mechanical modes such as dead weight or spring pressure, the working state of loose sealing and locking exists, and the product stability is low.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a fireproof check valve aiming at the defects in the prior art, and the valve plate can be normally opened and is well sealed.

The technical scheme adopted for solving the technical problems is as follows: the fireproof check valve comprises a valve body and a valve plate, wherein the valve plate is rotatably arranged in the valve body through a rotating shaft and can rotate relative to the valve body; the fireproof check valve further comprises a fireproof structure, wherein the fireproof structure comprises a buckling rod, a fuse link and a first elastic piece;

when the check valve works normally, the buckling rod is limited by the fuse link to separate from the valve plate, and in a flue fire state, the buckling rod is separated from the fuse link and presses the valve plate under the action of the first elastic piece to close the check valve; the method is characterized in that:

the check valve further comprises a driving assembly, the driving assembly comprises a driving mechanism used for driving the valve plate to rotate, the output end of the driving mechanism is connected with the rotating shaft through a fastener, and the fastener can be separated from the output end of the driving mechanism and the rotating shaft under the fire state of the flue, so that the output end of the driving mechanism is disconnected from the rotating shaft.

Through setting up electric drive assembly and driving the valve block rotation, under the prerequisite of guaranteeing the fire prevention function, adopt electric mechanism drive valve block rotation, guarantee that the valve block can normally open and good sealedly, in addition when range hood opens the back, if the valve block can not normally open (trouble or upstairs falling stone block etc.), the drive mechanism locked-rotor electric current can increase, can utilize this electric current increase signal to initiate the trouble warning and remind.

Further, the fastener passes through the output end of the driving mechanism and the rotating shaft, and the part of the fastener fixed with the output end of the driving mechanism or the rotating shaft forms a fusing part with fusing temperature lower than that of the fuse link, so that the fastener is separated from the connecting part in the same fusing mode, and the fuse link can be fused before the fuse link due to the fact that the fusing temperature of the fastener is lower than that of the fuse link, and the problem that when the fuse link fuses a buckling rod, the angle of the valve plate is locked by the driving mechanism and cannot be pressed by the buckling rod is avoided.

Further, in order to avoid that the fastener is left on the output end and the rotating shaft of the driving mechanism when being fused, the output end and the rotating shaft of the driving mechanism cannot be disconnected and cannot perform a fireproof function, the fireproof structure further comprises a second elastic piece, and the second elastic piece is connected with a part outside the fused part of the fastener so that the fastener keeps a trend of being separated from the output end and the rotating shaft of the driving mechanism.

In order to facilitate the arrangement of the second elastic piece, the second elastic piece is connected with the valve body or the buckling rod.

According to one aspect of the utility model, the check valve is of a single piece type, and the valve plate is of a disc shape;

the driving assembly further comprises a fixed support fixed in the valve body and a rotating support rotationally connected with the fixed support through a rotating shaft, and the rotating support is fixed with the valve plate.

The fixed support and the rotating shaft are arranged at positions adjacent to the side surfaces of the valve plates, and the rotating support extends to the valve plates to be fixed with the valve plates.

The fireproof structure comprises a valve plate, a fireproof structure and a fireproof structure, wherein the fireproof structure is characterized in that the fireproof structure is used for guiding movement of a buckling rod, the fireproof structure further comprises side plates arranged on two opposite sides of the valve plate, the buckling rod is arranged between the two side plates, a guide groove is formed in each side plate, the end part of the buckling rod is limited in the guide groove and can slide along the guide groove, one end of the guide groove is far away from the valve plate, and the other end of the guide groove is adjacent to the valve plate;

when the check valve works normally, two ends of the buckling rod are respectively limited at the end part of the corresponding guide groove far away from the valve plate, and the buckling rod keeps a sliding trend towards the other end of the guide groove through the first elastic piece.

In order to facilitate the connection between the first elastic piece and the buckling rod, two ends of the buckling rod can be controlled by using one first elastic piece, and the first elastic piece surrounds the valve plate and is fixed with two ends of the buckling rod.

According to another aspect of the utility model, the check valve is of a double-piece type, the valve plates are two, each valve plate is provided with a rotating shaft, a buckling rod and a first elastic piece, each valve plate is semicircular, and the rotating shaft is positioned at one side of each valve plate close to the other valve plate;

the driving assembly further comprises gears arranged on each rotating shaft, the two gears are meshed with each other, and the output end of the driving mechanism is connected with one rotating shaft through a fastener.

In order to facilitate the movement of the buckling rod, the fireproof structure further comprises a side plate which partially surrounds the periphery of the valve plate, a guide groove is formed in the side plate, and one end of the buckling rod is limited in the guide groove and can slide along the guide groove;

when the check valve works normally, the buckling rod is positioned at a position corresponding to the rotating shaft;

the first elastic member keeps the button rod in a tendency to slide along the guide groove to the end of the guide groove remote from each other.

For the range of motion of the restriction knot pole of being convenient for, avoid it to break away from the valve block, fireproof structure still includes the knot pole support that sets up adjacent with the valve block, fuse link and knot pole support are located the both sides that the valve block is relative respectively, the tip bending of keeping away from the guide way of knot pole extends into and detains in the pole support, detain the pole and can rotate relative knot pole support.

Compared with the prior art, the utility model has the advantages that: the valve plate is driven to rotate by the electric driving assembly, and the valve plate is driven to rotate by the electric mechanism on the premise of ensuring a fireproof function, so that the valve plate can be normally opened and well sealed; the fastener also realizes the separation with the connecting part by using the fusing mode, and because the fusing temperature is lower than that of the fuse, the fastener can be fused before the fuse, and the problem that the angle of the valve plate is locked by the driving mechanism and cannot be pressed by the buckling rod when the fuse fuses the buckling rod is avoided.

Drawings

Fig. 1 is a schematic view (working state) of a fire-proof check valve according to a first embodiment of the present utility model;

FIG. 2 is a schematic view (working state) of a fire protection check valve hiding valve body and bottom plate according to a first embodiment of the present utility model;

FIG. 3 is a schematic view of a fire protection check valve according to a first embodiment of the present utility model (fire protection closed state);

FIG. 4 is a schematic view of a fire protection check valve concealing a valve body and a base plate (fire protection closed state) according to a first embodiment of the utility model;

FIG. 5 is a schematic view (prior to fusing) of a fastener for a fire check valve according to a first embodiment of the present utility model;

FIG. 6 is a schematic view of a fastener (after fusing) of a fire check valve according to a first embodiment of the present utility model;

fig. 7 is a schematic view (working state) of a fire-proof check valve according to a second embodiment of the present utility model;

FIG. 8 is a schematic view (operational state) of a fire protection check valve concealing a valve body and a bottom plate according to a second embodiment of the utility model;

FIG. 9 is a schematic view of the drive assembly and valve plate of the fire check valve of the second embodiment of the present utility model;

fig. 10 is a schematic view of a fire protection check valve concealing a valve body and a bottom plate (fire protection closed state) according to a second embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present utility model may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Example 1

Referring to fig. 1 and 2, a fire-resistant check valve includes a valve body 1, a valve seat 2, a bottom plate 3, a valve sheet 4, a driving assembly, and a fire-resistant structure. The valve body 1, the valve seat 2 and the bottom plate 3 described above constitute a valve body. The check valve is a one-piece check valve, i.e. has only one valve plate 4.

Wherein the valve body 1 is a hollow structure with two open ends, the valve seat 2 and the bottom plate 3 are respectively arranged at the open ends of the two ends of the valve body 1, and the valve seat 2 and the bottom plate 3 are provided with openings (not shown) for oil smoke to pass through. The valve plate 4 is rotatably arranged on the valve seat 2, the valve plate 4 is disc-shaped, and the outer periphery of the valve plate 4 is provided with a sealing ring 41 so as to play a better sealing role when the valve plate is closed. By rotation of the valve plate 4, the opening in the valve seat 2 can be opened and closed. The structure is the same as the prior art.

The driving assembly comprises a driving mechanism 51, a fixed bracket 52, a rotating bracket 53 and a fastening piece 54, wherein the fixed bracket 52 is fixed in the valve body, for example, the fixed bracket 52 can be fixed with the valve seat 2, the rotating bracket 53 is rotationally connected with the fixed bracket 52 through a rotating shaft 43 of the valve plate 4, and the fastening piece 54 is used for fixedly connecting the output end of the driving mechanism 51 with the rotating shaft 43, so that the output end of the driving mechanism 51 drives the rotating bracket 53 to rotate. The rotating bracket 53 is fixed to the valve plate 4 so that the valve plate 4 can be driven to rotate when the driving mechanism 51 is started. The fixing bracket 52 and the rotating shaft 43 are disposed adjacent to the side surface of the valve plate 4, and the rotating bracket 53 extends onto the valve plate 4 to be fixed to the valve plate 4. In this embodiment, the driving mechanism 51 is a motor, and the fastener 54 directly connects the output shaft of the motor with the rotating shaft 43. Alternatively, the driving mechanism 51 may also include a motor, a reduction mechanism, and a transmission mechanism such as a gear or a rocker.

In the event of a fire in the flue, the fastener 54 is disengageable from the output, shaft 43, and the fastener 54 is preferably a pin. The end of the shaft 43 can be threaded into the output shaft of the motor and the fastener 54 can be threaded through the shaft 43 and the output shaft. Referring to fig. 5 and 6, alternatively, the fastener 54 includes a head 542, a tail 541, and a shaft portion 543 located between the head 542 and the tail 541, portions of the head 542 and the tail 541 being located outside of the output end of the drive mechanism 51, respectively, the shaft portion 543 being located partially within the output end and passing through the shaft 43, the tail 541 constituting a fuse portion which can be fused by a high temperature, and after fusing, the shaft portion 543 being able to slide out of the shaft 43 so as to be disengaged from the shaft 43. The head portion 542 and the shaft portion 543 may be separate pieces, and may be fixed by welding, caulking, or the like, for ease of installation. If the output extends into the shaft 43, the structure is similar.

The fireproof structure includes side plates 61 provided on opposite sides of the valve plate 4, a buckling rod 62 provided between the two side plates 61, a fuse link 63, a fuse link bracket 64, a first elastic member 65, and a second elastic member 66, the fuse link bracket 64 being provided between the two side plates 61, the side plates 61 and the fuse link bracket 64 being fixed in the valve body (may be fixed with the valve body 1, the valve seat 2, or the bottom plate 3). Each side plate 61 is provided with a guide groove 611. The guide grooves 611 extend obliquely, one end (higher end) of the guide groove 611 is away from the valve plate 4, the other end (lower end) of the guide groove 611 is adjacent to the valve plate 4, and both ends of the fastening rod 62 are respectively restrained in the corresponding guide grooves 611 and can slide along the guide grooves 611. The angled design of the guide channel 611 facilitates sliding of the button bar 62 from the upper end of the guide channel 611 to the lower end of the guide channel 611.

The first elastic member 65 is a locking spring which is fixed to both ends of the buckling rod 62 around the outside of the valve plate 4, and the fixed position is located on the outer side (away from the other side plate 61) of the side plate 61, whereby the first elastic member 65 has a substantially U-shape. The second elastic member 66 is a tension spring, and is connected to the shaft portion 543 of the fastener 54 exposed from the output end and the fastening lever 62, respectively. The fuse link 63 is provided on the fuse link holder 64 and is also connected to the buckle lever 62, preferably, at an intermediate position of the buckle lever 62. Thereby, the buckle lever 62 is restricted to a position close to the fuse holder 64 in a normal state.

The driving mechanism 51 and the fuse link holder 64 described above are provided on the same side of the valve plate 4.

The working principle of the fireproof check valve is as follows:

in normal operation, the fuse link 63 and the fastener 54 are not subjected to high temperature, and are not deformed or melted, so that the buckling rod 62 is limited to a position adjacent to and relatively fixed to the fuse link bracket 64, that is, the buckling rod 62 is located at one end of the guide groove 611, which is higher than the guide groove and is far away from the valve plate 4, so that the rotation of the valve plate 4 is avoided, and the first elastic member 65 is in a stretched state. When the range hood does not work, the driving mechanism 51 has locking pressure, the sealing ring 41 on the valve plate 4 is sealed with the valve seat 2, and the smoke tube of a user is isolated from a public flue or the outside under the action of the sealing ring 41, so that the smoke tube is prevented from being tainted. When the range hood works, the driving mechanism 51 receives a signal for starting the range hood, the driving valve plate 4 is normally started, and the fireproof check valve discharges smoke normally.

Referring to fig. 3 and 4, when the flue fires, the fusing part 541 where the fastener 54 is fixed to the rotating shaft 43 melts due to the high temperature, and the fusing temperature is lower than that of the fuse piece 63, ensuring that the fuse piece 63 melts before; thereafter, the fuse link 63 melts, releasing the buckling rod 62 restrained therein, at which time the buckling rod 62 slides evenly and rapidly along the guide groove 611 to the end of the guide groove 611 near the valve plate 4 until sliding down to the pressing valve plate 4 under the action of the first elastic member 65, and at the same time, the fastening member 54 moves together with the buckling rod 62 along with the second elastic member 66. After the buckling rod 62 presses the valve plate 4, the smoke pipe of the range hood is separated from the public flue, and the smoke pipe is prevented from firing. Because the elastic force of the first elastic member 65 can make the buckling rod 62 stably at the current position of pressing the valve plate 4, the buckling rod 62 is prevented from being separated from the fuse link 63 and cannot press the valve plate 4, and sealing is formed.

In addition, after the range hood is opened, if the valve plate 4 fails to be opened normally (a fault or a building falling stone is blocked, etc.), the blocking current of the driving mechanism 51 increases, and when the current value increases to a certain value, a signal is transmitted to the range hood, so that a fault warning prompt is initiated.

Example two

Referring to fig. 7 to 9, in the present embodiment, the difference from the first embodiment is that the check valve is of a double-piece type, the valve plates 4 are two, each valve plate 4 is of a semicircle shape, and the valve plates 4 are spliced into a complete circle shape. Each valve plate 4 has its corresponding rotation shaft 43. The drive assembly further comprises a gear 56 provided on each of the shafts 43, the two gears 56 being intermeshed, the output end of the drive mechanism 51 being secured to one of the shafts 43 by means of a fastener 54, whereby the drive mechanism 51 can simultaneously drive the two valve plates 4 in rotation. The two shafts 43 are disposed in parallel between the two valve plates 4. In order to avoid leakage of oil smoke from the gap between the two valve plates 4, a circular sealing piece 42 is arranged below the two valve plates 4, and the sealing piece 42 can move along with the valve plates 4.

The side plates 61 are arc-shaped, the guide grooves 611 are also arc-shaped and partially encircle the periphery of the valve plates 4, each side plate 61 corresponds to one valve plate 4, and one end of each side plate 61 can be mutually close to the other end. Correspondingly, the number of the buckling rods 62 is two, and each buckling rod 62 corresponds to one valve plate 4. The fireproof structure further comprises a buckling rod bracket 621, wherein the buckling rod bracket 621 is fixed in the valve body 1, and is respectively arranged at two opposite sides of the valve plate 4 with the side plates 61. One end of the button bar 62 is restrained in the corresponding guide groove 611 and is slidable along the guide groove 611, and the other end of the button bar 62 is bent downward to extend into the button bar bracket 621. The end of the button bar 62 is rotatable relative to the button bar bracket 621. The latch bracket 621 serves to limit the range of motion of the latch 62. To avoid the buckling rod 62 limiting the rotation of the valve plate 4, the buckling rod 62 may be located at a position corresponding to the rotation shaft 43 and parallel or nearly parallel to the rotation shaft 43 in normal operation.

The first elastic members 65 also have two corresponding buckling pieces, each buckling piece 62 corresponds to one first elastic member 65, one end of the first elastic member 65 is fixed in the valve body (can be fixed with the valve body 1, the valve seat 2 or the bottom plate 3), one end of the first elastic member 65 fixed with the valve body is close to the end of the corresponding side plate 61 far away from the other side plate 61, and the other end of the first elastic member 65 is fixed with the end of the buckling piece 62 located in the guide groove 611, so that the buckling piece 62 keeps the trend of sliding along the guide groove 611 to the end of the guide groove 611 far away from each other, and thus the valve plate 4 can be compressed without being parallel to the rotating shaft 43. One end of the second elastic member 66 is fixed in the valve body 1 (may be fixed to the valve body 1, the valve seat 2, or the bottom plate 3), and the other end is fixed to the pin 64.

The drive mechanism 51 is located on the same side of the valve plate 4 as the fuse link holder 64.

The working principle of the fireproof check valve is as follows:

in normal operation, the fuse link 63 and the fastener 54 are not subjected to high temperature, and are not deformed or melted, so that the buckle lever 62 is limited to a position adjacent to and relatively fixed to the fuse link holder 64, the first elastic member 65 is in a stretched state, and the driving mechanism 51 is kept connected to the rotating shaft 43. When the range hood is not in operation, the driving mechanism 51 has locking pressure, the valve plate 4 is pressed on the valve seat 2, and the user smoke tube is isolated from the public flue or the outside under the action of the sealing piece 42, so that the smoke tube is prevented from being tainted. When the range hood works, the driving mechanism 51 receives a signal for starting the range hood, the driving valve plate 4 is normally started, and the fireproof check valve discharges smoke normally.

Referring to fig. 10, when the flue fires, the part of the fastening member 54 fixed to the rotating shaft 43 melts due to the high temperature, the melting temperature of which is lower than that of the fuse piece 63, ensuring that the fuse piece 63 melts before, and the fastening member is automatically rotated under the action of the second elastic member 66, which is separated from the restraint of the output end of the driving mechanism 51; thereafter, the fuse link 63 melts, and the buckling rod 62 restrained therein is released, and at this time, the buckling rod 62 is rotated by the first elastic member 65, the end restrained in the guide groove 611 is rotated along the guide groove 611 to the end of the guide groove 611 away from the other guide groove 611 (i.e., to the end close to the end where the first elastic member 55 is fixed in the valve body 1), until the valve plate 4 is pressed. After the buckling rod 62 presses the valve plate 4, the smoke pipe of the range hood is separated from the public flue, and the smoke pipe is prevented from firing. Because the elastic force of the first elastic member 65 can make the buckling rod 62 stably at the current position of pressing the valve plate 4, the buckling rod 62 is prevented from being separated from the fuse link 63 and cannot press the valve plate 4, and sealing is formed.

Claims (11)

1. The fireproof check valve comprises a valve body and a valve plate (4), wherein the valve plate (4) is rotatably arranged in the valve body through a rotating shaft (43) and can rotate relative to the valve body; the fireproof check valve further comprises a fireproof structure, wherein the fireproof structure comprises a buckling rod (62), a fuse link (63) and a first elastic piece (65);

when the check valve works normally, the buckling rod (62) is limited by the fuse link (63) to be separated from the valve plate (4), and in a flue fire state, the buckling rod (62) is separated from the fuse link (63) and presses the valve plate (4) under the action of the first elastic piece (65) to close the check valve; the method is characterized in that:

the check valve further comprises a driving assembly, the driving assembly comprises a driving mechanism (51) used for driving the valve plate (4) to rotate, the output end of the driving mechanism (51) is connected with the rotating shaft (43) through a fastening piece (54), and in a flue firing state, the fastening piece (54) can be separated from the output end of the driving mechanism (51) and the rotating shaft (43), so that the output end of the driving mechanism (51) is disconnected from the rotating shaft (43).

2. The fire protection check valve of claim 1, wherein: the fastener (54) passes through the output end of the driving mechanism (51) and the rotating shaft (43), and the part of the fastener (54) fixed with the output end of the driving mechanism (51) or the rotating shaft (43) forms a fusing part with fusing temperature lower than that of the fusing piece (63).

3. The fire protection check valve of claim 2, wherein: the fire protection structure further includes a second elastic member (66), the second elastic member (66) being connected to a portion other than the fused portion of the fastener (54) so as to enable the fastener (54) to maintain a tendency to disengage from the output end of the driving mechanism (51) and the rotating shaft (43).

4. A fire protection check valve according to claim 3, wherein: the second elastic member (66) is connected with the valve body or the buckling rod (62).

5. The fire protection check valve of any one of claims 1-4, wherein: the check valve is a single piece, and the valve plate (4) is disc-shaped;

the driving assembly further comprises a fixed support (52) fixed in the valve body and a rotating support (53) rotationally connected with the fixed support (52) through a rotating shaft (43), and the rotating support (53) is fixed with the valve plate (4).

6. The fire protection check valve of claim 5, wherein: the fixed support (52) and the rotating shaft (43) are arranged at positions adjacent to the side face of the valve plate (4), and the rotating support (53) extends to the valve plate (4) and is fixed with the valve plate (4).

7. The fire protection check valve of claim 5, wherein: the fireproof structure further comprises side plates (61) arranged on two opposite sides of the valve plate (4), the buckling rod (62) is arranged between the two side plates (61), the side plates (61) are provided with guide grooves (611), the end parts of the buckling rod (62) are limited in the guide grooves (611) and can slide along the guide grooves (611), one end of the guide grooves (611) is far away from the valve plate (4), and the other end of the guide grooves (611) is adjacent to the valve plate (4);

when the check valve works normally, two ends of the buckling rod (62) are respectively limited at the end part of the corresponding guide groove (611) far away from the valve plate (4), and the buckling rod (62) keeps the sliding trend towards the other end of the guide groove (611) through the first elastic piece (65).

8. The fire protection check valve of claim 7, wherein: the first elastic piece (65) surrounds the valve plate (4) and is fixed with two ends of the buckling rod (62).

9. The fire protection check valve of any one of claims 1-4, wherein: the check valve is of a double-piece type, each valve piece (4) is provided with two rotating shafts (43), buckling rods (62) and first elastic pieces (65) in a corresponding mode, each valve piece (4) is semicircular, and the rotating shafts (43) are located on one side, close to the other valve piece (4), of each valve piece (4);

the drive assembly further comprises a gear (56) arranged on each rotating shaft (43), the two gears (56) are meshed with each other, and the output end of the drive mechanism (51) is connected with one rotating shaft (43) through a fastener (54).

10. The fire protection check valve of claim 9, wherein: the fireproof structure further comprises a side plate (61) which partially surrounds the periphery of the valve plate (4), a guide groove (611) is formed in the side plate (61), and one end of the buckling rod (62) is limited in the guide groove (611) and can slide along the guide groove (611);

when the check valve works normally, the buckling rod (62) is positioned at a position corresponding to the rotating shaft (43);

the first elastic member (65) keeps the button bar (62) from sliding along the guide groove (611) to the end of the guide groove (611) away from each other.

11. The fire protection check valve of claim 10, wherein: the fireproof structure further comprises a buckling rod support (621) arranged adjacent to the valve plate (4), the fuse link (63) and the buckling rod support (621) are respectively located on two opposite sides of the valve plate (4), the end portion, far away from the guide groove (611), of the buckling rod (62) is bent and extends into the buckling rod support (621), and the buckling rod (62) can rotate relative to the buckling rod support (621).

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