Electric fireproof check valve and extractor hood

Abstract

The application provides an electric fireproof check valve and an extractor hood. The electric fireproof check valve comprises a valve seat and a check valve plate. The valve seat is internally provided with an air duct. The valve seat is provided with coaxial first and second rotating shafts. A sliding block is sleeved on the opposite end of the first and second rotating shafts. The inner wall of the sliding block is provided with a driving plane. The opposite end of the first and second rotating shafts is provided with a driven plane corresponding to the driving plane. The end of the second rotating shaft away from the first rotating shaft is connected with a rotating driving device. The sliding block is connected with a heat melting mechanism. When the heat melting mechanism is melted, the sliding block is driven to slide to the first or second rotating shaft. The check valve plate normally closes the air duct. The check valve plate is connected with the first rotating shaft through a transmission mechanism. The first rotating shaft drives the check valve plate to open or close the air duct. The electric fireproof check valve can realize the electric opening and closing of the check valve plate. When a fire occurs in a room or a public air duct, the air duct can be timely cut off to prevent the fire from spreading to the room or the public air duct, and the harm of the fire is reduced as much as possible.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to an electric fireproof check valve and a range hood. Background Technology

[0002] Currently, most household range hoods use check valves that cannot promptly shut off the airflow in the event of a fire, preventing the fire from spreading further. While mechanical fire-resistant check valves are available, their response time is slow, and they may leak air and fail to seal properly if the range hood fan is not turned off, thus failing to effectively stop the fire from spreading.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide an electric fireproof check valve that can electrically open and close the check valve plate, and at the same time, can promptly cut off the air duct in case of fire in the indoor or public smoke duct, prevent the fire from spreading indoors or to the public smoke duct, and minimize the damage caused by the fire.

[0005] Another objective of this invention is to provide a range hood that includes the aforementioned electric fireproof check valve, which can electrically open and close the check valve plate, and can promptly cut off the air duct in case of fire in the indoor or public flue, preventing the fire from spreading indoors or to the public flue, thereby minimizing the damage caused by the fire.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An electric fireproof check valve includes a valve seat and a check valve disc; The valve seat has an internal air duct; the valve seat also has a coaxial first rotating shaft and a second rotating shaft; a slider is sleeved on the opposite end of the first rotating shaft and the second rotating shaft, and the inner wall of the slider has a driving plane; the opposite ends of the first rotating shaft and the second rotating shaft each have a driven plane corresponding to the driving plane; the end of the second rotating shaft away from the first rotating shaft is connected to a rotation drive device; the slider is connected to a heat-melting mechanism, so that after the heat-melting mechanism melts, it drives the slider to slide onto the first rotating shaft or the second rotating shaft; The check valve plate normally closes the air duct; the check valve plate is connected to the first rotating shaft through a transmission mechanism, so that the first rotating shaft drives the check valve plate to open or close the air duct.

[0007] According to one embodiment of the present invention, the outer wall of the slider is provided with a groove extending circumferentially along the slider; the hot-melt mechanism includes a lever disposed on the valve seat and rotatable, one end of the lever being located in the groove; the other end of the lever is connected to the valve seat through a fusible link and is connected to the valve seat through a first return spring.

[0008] According to one embodiment of the present invention, the middle part of the lever is hinged to the valve seat by a pin, and one end of the lever is provided with a U-shaped fork, which is located in the grooves on both sides of the slider.

[0009] According to one embodiment of the present invention, a second return spring is provided between the check valve plate and the valve seat, so that the check valve plate normally closes the air duct.

[0010] According to one embodiment of the present invention, the check valve includes a first valve and a second valve symmetrically arranged, the first valve and the valve seat are connected by a third rotating shaft, the second valve and the valve seat are connected by a fourth rotating shaft, and the third rotating shaft and the fourth rotating shaft are arranged adjacent to each other in the middle of the air duct.

[0011] According to one embodiment of the present invention, the transmission mechanism includes a drive frame, one end of which is perpendicularly connected to the first rotating shaft, and the other end of the drive frame is provided with a first traction member and a second traction member on both sides respectively; the end of the first traction member is connected to the first valve plate, and the end of the second traction member is connected to the second valve plate; the two ends of the second return spring are respectively connected to the drive frame and the valve seat.

[0012] According to one embodiment of the present invention, the first traction member and the second traction member are flexible ropes; Alternatively, the first traction member and the second traction member are connecting plates, and the transmission mechanism further includes a first adapter plate and a second adapter plate connected between the first traction member, the second traction member and the drive frame; both ends of the first traction member are respectively hinged to one end of the first valve plate and one end of the first adapter plate, and both ends of the second traction member are respectively hinged to the other end of the second valve plate and the first adapter plate; the middle part of the first adapter plate is hinged to one end of the second adapter plate, and the drive frame is hinged to the other end of the second adapter plate.

[0013] According to one embodiment of the present invention, the number of driven planes of the first rotating shaft and the second rotating shaft is one, such that the cross-section of the opposite end of the first rotating shaft and the second rotating shaft is D-shaped; Alternatively, the number of driven planes of the first rotating shaft and the second rotating shaft is two and they are arranged opposite to each other; Alternatively, the number of driven planes of the first and second rotating shafts is greater than two and they are connected end to end, so that the cross-section of the opposite end of the first and second rotating shafts is a regular polygon.

[0014] According to one embodiment of the present invention, the rotation drive device is an electric motor.

[0015] The present invention also provides a range hood, including the above-mentioned electric fireproof check valve; the control device of the range hood is connected to the rotation drive device.

[0016] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are as follows: The electric fireproof check valve and range hood provided in this invention allow the first rotating shaft to rotate via a rotary drive device, enabling the check valve plate to open and close electrically. When the range hood is turned on for exhaust, it reduces back pressure during startup. In the event of a fire in the indoor or public flue, the heat-fusion mechanism melts, and the slider slides onto either the first or second rotating shaft, disconnecting the transmission connection between them. The check valve plate normally closes the duct. Therefore, regardless of whether the rotary drive device is functioning properly, it can quickly respond and cut off the duct, preventing further fire spread and reducing damage. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the structure of the electric fireproof check valve provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the electric fireproof check valve provided in an embodiment of the present invention from another angle; Figure 3 This is a schematic diagram of the structure of the electric fireproof check valve provided in an embodiment of the present invention after the outer shell is removed and the check valve plate is closed. Figure 4 This is a front view of the electric fireproof check valve provided in an embodiment of the present invention with the outer casing removed and the check valve plate closed. Figure 5 This is a schematic diagram of the structure of the electric fireproof check valve provided in an embodiment of the present invention after the outer shell is removed and the check valve plate is open; Figure 6 This is a front view of the electric fireproof check valve provided in an embodiment of the present invention with the outer casing removed and the check valve plate open. Figure 7 A schematic diagram of the structure of the electric fireproof check valve at the moment of fracture of the fusible link provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the electric fireproof check valve after the fusible link breaks, as provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of the transmission mechanism of the electric fireproof check valve provided in an embodiment of the present invention; Figure 10This is a schematic diagram of the transmission mechanism of the electric fireproof check valve provided in an embodiment of the present invention after removing the first valve plate.

[0018] Explanation of reference numerals in the attached figures: 1. Valve seat; 11. First rotating shaft; 12. Second rotating shaft; 13. Slider; 131. Slide groove; 14. Second return spring; 15. Housing; 2. Check valve plate; 21. First valve plate; 22. Second valve plate; 23. Third rotating shaft; 24. Fourth rotating shaft; 3. Air duct; 31. Mounting plate; 4. Rotation drive device; 5. Hot melt mechanism; 51. Lever; 511. Fork; 52. Fusible link; 53. First return spring; 54. Pin; 6. Transmission mechanism; 61. Drive frame; 62. Connecting plate; 63. First adapter plate; 64. Second adapter plate. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0020] In the description of this invention, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] like Figures 1-6As shown, this embodiment of the invention provides an electric fireproof check valve, including a valve seat 1 and a check valve plate 2. The valve seat 1 has an internal air duct 3 for discharging gas from equipment such as a range hood. The valve seat 1 also has a coaxial first rotating shaft 11 and a second rotating shaft 12. A slider 13 is fitted onto one end of the first rotating shaft 11 opposite to the second rotating shaft 12, and the inner wall of the slider 13 has a driving plane. Both the first rotating shaft 11 and the second rotating shaft 12 have a driven plane corresponding to the driving plane at their opposite ends. The driving plane of the slider 13 meshes with the driven planes of the first rotating shaft 11 and the second rotating shaft 12, allowing the slider 13, the first rotating shaft 11, and the second rotating shaft 12 to rotate synchronously (preventing idle rotation). The end of the second rotating shaft 12 away from the first rotating shaft 11 is connected to a rotation drive device 4 (e.g., a motor) to drive the second rotating shaft 12 to rotate, which in turn drives the first rotating shaft 11 to rotate via the slider 13. The slider 13 is connected to the heat-melting mechanism 5. Under normal conditions, the heat-melting mechanism 5 keeps the slider 13 connected to both the first rotating shaft 11 and the second rotating shaft 12. When the heat-melting mechanism 5 melts, it drives the slider 13 to slide onto either the first rotating shaft 11 or the second rotating shaft 12, thus disengaging the transmission connection between the two shafts. The check valve 2 normally closes the air duct 3; that is, it remains closed when no external force is applied to it. The check valve 2 is connected to the first rotating shaft 11 via a transmission mechanism 6, so that when the first rotating shaft 11 rotates, it drives the check valve 2 to open or close the air duct 3.

[0022] The electric fireproof check valve provided in this embodiment of the invention, when in use, can drive the first rotating shaft 11 to rotate via the rotation drive device 4, thereby realizing the electric opening and closing of the check valve plate 2. This reduces the back pressure during startup of equipment such as range hoods when exhaust ventilation is activated. Figures 7-8 As shown, when a fire occurs indoors or in a public flue, the heat fusion mechanism 5 melts, and the slider 13 slides onto the first rotating shaft 11 or the second rotating shaft 12 (in this embodiment, the slider 13 slides onto the second rotating shaft 12). The transmission connection between the first rotating shaft 11 and the second rotating shaft 12 is disconnected, and the check valve plate 2 normally closes the air duct 3. Therefore, regardless of whether the rotation drive device 4 is working properly, it can quickly respond and cut off the air duct 3 to prevent the fire from spreading further and reduce the harm.

[0023] To achieve the function of the hot-melt mechanism 5, such as Figures 3-8As shown, in one embodiment of the present invention, the outer wall of the slider 13 is provided with a groove 131 extending circumferentially along the slider 13. The hot-melt mechanism 5 includes a lever 51 disposed on the valve seat 1 and rotatable. One end of the lever 51 is located in the groove 131 to limit the position of the slider 13 when the hot-melt mechanism 5 is not hot-melting, so as to maintain its transmission connection with the first rotating shaft 11 and the second rotating shaft 12. The other end of the lever 51 is connected to the valve seat 1 by a fusible link 52 and to the valve seat 1 by a first return spring 53. The first return spring 53 can cause the end of the lever 51 located in the groove 131 to tend to rotate in the direction of the first rotating shaft 11 or the second rotating shaft 12, but this tendency is prevented by the fusible link 52. Therefore, when a fire occurs indoors or in a public flue, the temperature reaches the melting point of the fuse 52, causing it to thermally melt and break. The first return spring 53 drives the lever 51 to rotate at one end of the slide groove 131 toward the first rotating shaft 11 or the second rotating shaft 12, thereby driving the slider 13 to slide onto the first rotating shaft 11 or the second rotating shaft 12, disconnecting the transmission connection between the first rotating shaft 11 and the second rotating shaft 12. Since the check valve 2 normally closes the air duct 3, regardless of whether the drive device 4 is functioning properly, it can quickly respond and cut off the air duct 3, preventing further spread of the fire and reducing the damage.

[0024] Specifically, such as Figure 3 , Figure 5 As shown, the middle part of the lever 51 is hinged to the valve seat 1 via a pin 54. One end of the lever 51 is provided with a U-shaped fork 511. The fork 511 is located in the grooves 131 on both sides of the slider 13, so that the slider 13 is subjected to balanced force and prevents the slider 13 from getting stuck when sliding towards the first rotating shaft 11 or the second rotating shaft 12.

[0025] In order to automatically close the air duct 3 when the transmission connection between the first rotating shaft 11 and the second rotating shaft 12 is disconnected, such as... Figure 3 , Figure 4 , Figure 7 , Figure 8 As shown, in one embodiment of the present invention, a second reset spring 14 is provided between the check valve plate 2 and the valve seat 1, so that the check valve plate 2 normally closes the air duct 3.

[0026] like Figures 3-8 As shown, in one embodiment of the present invention, the check valve 2 includes a first valve 21 and a second valve 22 symmetrically arranged. The first valve 21 is connected to the valve seat 1 via a third rotating shaft 23, and the second valve 22 is connected to the valve seat 1 via a fourth rotating shaft 24. The third rotating shaft 23 and the fourth rotating shaft 24 are arranged adjacent to each other in the middle of the air duct 3. Figures 2-5As shown, to install the third rotating shaft 23 and the fourth rotating shaft 24, a mounting plate 31 can be provided in the middle of the air duct 3. Both ends of the mounting plate 31 are connected to the valve seat 1, and the third rotating shaft 23 and the fourth rotating shaft 24 are mounted on the mounting plate 31. In this embodiment, the check valve 2 is a semi-open double-leaf design, which allows for a larger opening angle and minimizes encroachment on the common flue. The check valve 2 can be located inside or at the end of the air duct 3, such as... Figures 1-2 As shown, in this embodiment, it is located at the air outlet of the air duct 3, and is provided with a housing 15 to cover the rotation drive device 4 and the hot melt mechanism 5. The housing 15 is provided with an opening corresponding to the air duct 3.

[0027] To achieve the connection between the check valve plate 2 and the first rotating shaft 11, as follows: Figures 9-10 As shown, in one embodiment of the present invention, the transmission mechanism 6 includes a drive frame 61. One end of the drive frame 61 is perpendicularly connected to the first rotating shaft 11, and the other end of the drive frame 61 is provided with a first traction member and a second traction member on both sides. The end of the first traction member is connected to the first valve plate 21, and the end of the second traction member is connected to the second valve plate 22. When the first rotating shaft 11 rotates, it drives the drive frame 61 to rotate, which in turn drives the first traction member and the second traction member to pull the first valve plate 21 and the second valve plate 22 to rotate, thereby opening and closing the air duct 3. In order to achieve the normal closed air duct by the check valve plate 2, the two ends of the second return spring 14 are connected to the drive frame 61 and the valve seat 1, respectively.

[0028] like Figures 9-10 As shown, in one embodiment of the present invention, the first traction member and the second traction member are connecting plates 62. Since they are rigidly connected, in order to ensure that the check valve plate 2 is subjected to reasonable force and reduce resistance during movement, the transmission mechanism 6 further includes a first adapter plate 63 and a second adapter plate 64 connected between the first traction member, the second traction member, and the drive frame 61. Both ends of the first traction member are hinged to one end of the first valve plate 21 and one end of the first adapter plate 63, respectively. Both ends of the second traction member are hinged to the other end of the second valve plate 22 and the first adapter plate 63, respectively. The middle part of the first adapter plate 63 is hinged to one end of the second adapter plate 64, and the drive frame 61 is hinged to the other end of the second adapter plate 64.

[0029] In another embodiment of the present invention, the first traction member and the second traction member are flexible ropes. When the drive frame 61 rotates, it drives the first traction member and the second traction member to pull the first valve plate 21 and the second valve plate 22 to rotate, so as to open the air duct 3. When the drive frame 61 rotates in the opposite direction, the second return spring 14 drives the first valve plate 21 and the second valve plate 22 to rotate in the opposite direction, so as to close the air duct 3.

[0030] In another embodiment of the present invention, the number of driven planes of the first rotating shaft 11 and the second rotating shaft 12 is one, such that the cross-section of the opposite end of the first rotating shaft 11 and the second rotating shaft 12 is D-shaped. Alternatively, in other embodiments of the present invention, the number of driven planes of the first rotating shaft 11 and the second rotating shaft 12 is two and they are arranged opposite each other, such that the cross-section of the opposite end of the first rotating shaft 11 and the second rotating shaft 12 is a rectangle with a set of opposite sides that are rounded. Alternatively, in other embodiments of the present invention, the number of driven planes of the first rotating shaft 11 and the second rotating shaft 12 is greater than two and they are connected end-to-end, such that the cross-section of the opposite end of the first rotating shaft 11 and the second rotating shaft 12 is a regular polygon, such as an equilateral triangle, square, regular pentagon, regular hexagon, etc.

[0031] In another embodiment of the present invention, the rotation drive device 4 is a motor. Because the motor has a self-locking characteristic, the check valve plate 2 can remain stable in the open and closed positions under the influence of the motor's self-locking characteristic during normal use.

[0032] The present invention also provides a range hood, including the aforementioned electric fireproof check valve. The control device of the range hood is connected to the rotary drive device 4, realizing the linkage between the electric fireproof check valve and the range hood fan, and is applicable in the following scenarios: Scenario 1: Normal use; When the range hood is started, its control device outputs a valve opening signal, the motor drives check valve 2 to open and maintain a stable position, and it works normally; When the range hood is turned off, the control device outputs a valve closing signal after a delay time. At this time, the motor reverses to drive check valve 2 to close and maintain a tight seal. Scenario 2: Indoor fire + normal motor operation; After the temperature sensor inside the range hood detects high temperature, the control device immediately shuts down the range hood fan and outputs a valve closing signal. At this time, the motor drives the check valve 2 to close and remain tightly closed, which can quickly prevent the fire from spreading further to the public flue and causing harm to other residents. Scenario 3: Indoor fire + motor damage; After the temperature sensor inside the range hood detects high temperature, the control device immediately shuts off the range hood fan; If the fire continues to increase, the heat fusion mechanism 5 in the electric fireproof check valve will melt and break at the critical temperature, and the check valve plate 2 will be closed according to the aforementioned mechanism process, which can prevent the fire from spreading further to the public flue and causing harm to other residents. Scenario 4: Fire spreads through the public flue + motor is normal; After the thermomelting mechanism 5 in the electric fireproof check valve reaches the critical temperature and melts, the check valve plate 2 is closed according to the aforementioned mechanism. At this time, the control device detects that the back pressure of the range hood fan increases instantaneously, and immediately outputs a signal to shut down the range hood fan, and at the same time outputs a signal to close the valve plate. The motor on the check valve further closes the check valve plate 2, quickly responding to prevent the fire in the public flue from spreading to the residents' homes. Scenario 5: Fire spreading through the public flue + motor damage; After the thermal fusion mechanism 5 in the electric fireproof check valve reaches the critical temperature and melts, the check valve plate 2 is closed according to the aforementioned mechanism. At this time, the control device detects that the back pressure of the range hood fan increases instantaneously, and immediately outputs a signal to shut down the range hood fan, quickly responding to prevent the check valve plate from leaking and effectively preventing the fire in the public flue from spreading to the residents' homes.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric fireproof check valve, characterized in that, Includes valve seat (1) and check valve plate (2); The valve seat (1) is provided with an air duct (3) inside; the valve seat (1) is also provided with a coaxial first rotating shaft (11) and a second rotating shaft (12); a slider (13) is sleeved on one end of the first rotating shaft (11) opposite to the second rotating shaft (12), and a driving plane is provided on the inner wall of the slider (13); both the first rotating shaft (11) and the second rotating shaft (12) are provided with a driven plane corresponding to the driving plane at one end opposite to the first rotating shaft (11); the end of the second rotating shaft (12) away from the first rotating shaft (11) is connected to a rotation drive device (4); the slider (13) is connected to a hot melt mechanism (5), so that after the hot melt mechanism (5) melts, it drives the slider (13) to slide onto the first rotating shaft (11) or the second rotating shaft (12); The check valve plate (2) normally closes the air duct (3); the check valve plate (2) is connected to the first rotating shaft (11) through a transmission mechanism (6), so that the first rotating shaft (11) drives the check valve plate (2) to open or close the air duct (3).

2. The electric fireproof check valve according to claim 1, characterized in that, The outer wall of the slider (13) is provided with a groove (131) extending circumferentially along the slider (13); the hot melt mechanism (5) includes a lever (51) disposed on the valve seat (1) and rotatable, one end of the lever (51) being located in the groove (131); the other end of the lever (51) is connected to the valve seat (1) by a fusible piece (52) and is connected to the valve seat (1) by a first return spring (53).

3. The electric fireproof check valve according to claim 2, characterized in that, The lever (51) is hinged to the valve seat (1) via a pin (54) at the middle. One end of the lever (51) is provided with a U-shaped fork (511), which is located in the grooves (131) on both sides of the slider (13).

4. The electric fireproof check valve according to claim 2, characterized in that, A second return spring (14) is provided between the check valve plate (2) and the valve seat (1) so that the check valve plate (2) normally closes the air duct (3).

5. The electrically operated fireproof check valve according to any one of claims 1 to 4, characterized in that, The check valve (2) includes a first valve (21) and a second valve (22) arranged symmetrically. The first valve (21) is connected to the valve seat (1) through a third rotating shaft (23), and the second valve (22) is connected to the valve seat (1) through a fourth rotating shaft (24). The third rotating shaft (23) and the fourth rotating shaft (24) are arranged adjacent to each other in the middle of the air duct (3).

6. The electric fireproof check valve according to claim 5, characterized in that, The transmission mechanism (6) includes a drive frame (61), one end of which is perpendicularly connected to the first rotating shaft (11), and the other end of the drive frame (61) is provided with a first traction member and a second traction member on both sides respectively; the end of the first traction member is connected to the first valve plate (21), and the end of the second traction member is connected to the second valve plate (22); the two ends of the second return spring (14) are connected to the drive frame (61) and the valve seat (1) respectively.

7. The electric fireproof check valve according to claim 6, characterized in that, The first traction member and the second traction member are flexible ropes; Alternatively, the first traction member and the second traction member are connecting plates (62), and the transmission mechanism (6) further includes a first adapter plate (63) and a second adapter plate (64) connected between the first traction member, the second traction member and the drive frame (61); the two ends of the first traction member are respectively hinged to one end of the first valve plate (21) and the first adapter plate (63), and the two ends of the second traction member are respectively hinged to the other end of the second valve plate (22) and the first adapter plate (63); the middle part of the first adapter plate (63) is hinged to one end of the second adapter plate (64), and the drive frame (61) is hinged to the other end of the second adapter plate (64).

8. The electrically operated fireproof check valve according to any one of claims 1 to 4, characterized in that, The first rotating shaft (11) and the second rotating shaft (12) have one driven plane, so that the cross-section of the opposite end of the first rotating shaft (11) and the second rotating shaft (12) is D-shaped; Alternatively, the number of driven planes of the first rotating shaft (11) and the second rotating shaft (12) are two and arranged opposite to each other; Alternatively, the number of driven planes of the first rotating shaft (11) and the second rotating shaft (12) is greater than two and they are connected end to end, so that the cross-section of the opposite end of the first rotating shaft (11) and the second rotating shaft (12) is a regular polygon.

9. The electrically operated fireproof check valve according to any one of claims 1 to 4, characterized in that, The rotation drive device (4) is a motor.

10. A range hood, characterized in that, Includes an electric fireproof check valve according to any one of claims 1 to 9; the control device of the range hood is connected to the rotary drive device (4).

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