Fireproof smoke exhaust system
By designing a directly connected actuator and control shaft of the fire-proof smoke valve in the fire-proof smoke exhaust system, the existing system's control response speed is slow and prone to errors is solved, and faster and more accurate fire-proof smoke exhaust control is achieved.
Patent Information
- Application Number
- CN202421409858.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The control response speed of existing fire-proof and smoke exhaust systems is slow and easy to generate control errors, resulting in the inability to effectively prevent the spread of fire smoke.
A fire-proof and smoke exhaust system is designed, which includes a duct network, a fire-proof and smoke exhaust valve, an actuator and a control panel. The actuator is directly connected to the control shaft of the fire-proof smoke exhaust valve through the rotating shaft and the rotating motor. The rotating position detection mechanism and the limiting mechanism are used to accurately control the position of the turntable, so as to quickly respond and accurately control the opening and closing of the fire-proof smoke exhaust valve.
By directly setting the actuator on the fire-proof smoke exhaust valve and directly connecting it with the control shaft of the blade, the response speed and control accuracy of the fire-proof smoke exhaust valve are improved, and the problem of control error in the existing system is solved.
Smart Images
Figure CN222634749U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of fire protection engineering, and in particular to a fire prevention and smoke exhaust system. Background Art
[0002] The fire smoke exhaust system is used in buildings to prevent the spread of fire smoke. The fire smoke exhaust system usually has a normally open or normally closed fire smoke exhaust valve at the air duct outlet, and a control device for controlling the operation and reset of the fire smoke exhaust valve is set on the wall of the public area of the building. Since the fire smoke exhaust valve and the control device are far apart, the fire smoke exhaust system of the prior art will be equipped with a remote control actuator. The fire smoke exhaust valve has a blade and a rotating shaft that controls the opening and closing of the blade. The remote control actuator controls the opening and closing of the fire smoke exhaust valve through a wire rope wound on the rotating shaft.
[0003] However, this method of using a steel wire rope to control the opening and closing of the fire smoke exhaust damper has many problems such as slow control response speed and long transmission distance, which easily leads to control errors. Utility Model Content
[0004] Based on this, it is necessary to provide a fire prevention and smoke exhaust system to solve the technical problems of slow control response speed and easy control error in the fire prevention and smoke exhaust system in the prior art.
[0005] To achieve the above objectives, the present application provides a fire prevention and smoke exhaust system, which includes:
[0006] The air duct network is laid inside the building;
[0007] The fire smoke exhaust valve is arranged at the pipe opening of the air duct network. The fire smoke exhaust valve comprises a housing, a control shaft and a blade. The housing has a channel connected to the pipe opening. The control shaft is arranged perpendicular to the extension direction of the channel and is rotatably connected to the housing. The blade is arranged on the control shaft. When the control shaft rotates, the blade can be driven to rotate together to close or open the channel.
[0008] an actuator, disposed on the housing, the actuator having a rotating shaft connected to the control shaft; and
[0009] The control panel is arranged on the wall of the building, and the control panel is communicatively connected to the actuator to control the rotation of the rotating shaft.
[0010] Optionally, the actuator further includes:
[0011] The housing is formed with a receiving cavity, and the rotating shaft rotatably penetrates the exterior of the housing;
[0012] A rotating motor is arranged in the accommodating cavity;
[0013] A transmission mechanism, connecting the rotating motor and the rotating shaft;
[0014] A turntable is arranged in the accommodating cavity and sleeved on the rotating shaft. A limit notch is arranged on the edge of the turntable. The turntable has a first stop position and a second stop position. The turntable rotates between the first stop position and the second stop position.
[0015] A limiting mechanism is arranged in the accommodating cavity and acts on the rotating disk, and the limiting mechanism has a locking state of being engaged with the limiting notch and an unlocking state of exiting the limiting notch;
[0016] A rotation position detection mechanism, used for detecting the rotation position of the rotating shaft;
[0017] A controller is electrically connected to the rotating motor, the limiting mechanism and the rotating position detecting mechanism respectively; and
[0018] A power supply is electrically connected to the rotating motor, the limiting mechanism, the rotating position detection mechanism and the controller respectively;
[0019] When the rotation position detection mechanism detects that the turntable rotates to the first stop position, the limit mechanism switches to a locked state.
[0020] Optionally, the limiting mechanism includes:
[0021] A first mounting shaft, fixed relative to the housing;
[0022] A first rotating member, one end of which is rotatably mounted on a first mounting shaft, and the rotating disk is located on a rotating path of the first rotating member;
[0023] A first torsion spring, used to make the first rotating member always have a tendency to rotate in a direction close to the rotating disk;
[0024] A limiting post, disposed on the first rotating member and corresponding to the limiting notch;
[0025] A second mounting shaft is fixed relative to the housing;
[0026] A second rotating member, the middle part of which is rotatably mounted on the second mounting shaft, the second rotating member having a first end and a second end, the rotating disk being located on a rotating path of the first end, during the process of the first end rotating in a direction close to the rotating disk, the first end can contact the first rotating member and drive the first rotating member to rotate in a direction away from the rotating disk, the limiting post can exit the limiting notch to switch the limiting mechanism to an unlocked state, during the process of the first end rotating in a direction away from the rotating disk, the first end can leave the first rotating member, the limiting post can be engaged with the limiting notch to switch the limiting mechanism to a locked state; and
[0027] The linear drive mechanism comprises a driving end, wherein the driving end is rotatably connected to the second end to drive the second rotating member to rotate.
[0028] Optionally, the limiting mechanism further includes a second torsion spring, and the second torsion spring is used to ensure that the first end always has a tendency to rotate in a direction close to the turntable, and the linear drive mechanism is an electromagnet.
[0029] Optionally, when the first end drives the first rotating member to rotate away from the turntable, the end surface of the first rotating member always abuts against the side surface of the first end, and a notch is provided on the side surface of the first end for limiting the first rotating member from separating from the first end.
[0030] Optionally, in the process of the first end driving the first rotating member to rotate in a direction away from the turntable, the first rotating member and the second rotating member are always arranged at an acute angle.
[0031] Optionally, the transmission mechanism is a gear box.
[0032] Optionally, the rotation position detection mechanism includes:
[0033] A pressure plate, convexly disposed on the circumferential side surface of the rotating disk; and
[0034] The micro switch is arranged on the rotation path of the pressing plate and is electrically connected to the controller. When the rotating disk rotates to the first stop position, the pressing plate triggers the micro switch.
[0035] Optionally, both ends of the rotating shaft can rotatably penetrate the outside of the housing, and an angle disk for indicating the opening angle of the blade is provided at one end of the rotating shaft away from the control shaft.
[0036] Optionally, the angle disc is provided with an arc groove, and the actuator further comprises:
[0037] A main torsion spring, used to ensure that the turntable always has a tendency to rotate from the first stop position to the second stop position; and
[0038] The limit rod is in the arc groove and fixed on the shell. When the turntable rotates from the first stop position to the second stop position, the limit rod can contact the end of the arc groove to stop the turntable from rotating at the second stop position.
[0039] The beneficial effects of the fire smoke exhaust system provided by the present application are as follows: compared with the prior art, the fire smoke exhaust system of the present application includes a duct network, a fire smoke exhaust valve, an actuator and a control panel; the fire smoke exhaust valve includes a shell, a control shaft and blades; the blades are arranged on the control shaft; when the control shaft rotates, the blades can be driven to rotate together to close or open the channel; the actuator is arranged on the shell, the actuator has a rotating shaft, the rotating shaft is connected to the control shaft, the control panel is arranged on the wall of the building, and the control panel is communicatively connected to the actuator to control the rotation of the rotating shaft; in this way, the control panel and the actuator are remotely communicated and the signal transmission speed is fast; the actuator is also directly arranged on the fire smoke exhaust valve and directly connected to the control shaft of the blades, thereby improving the response speed and control accuracy of the fire smoke exhaust valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0041] Figure 1 A schematic diagram of a fire prevention and smoke exhaust system provided in an embodiment of the present application;
[0042] Figure 2 A schematic diagram of the internal structure of the actuator of the fire protection and smoke exhaust system provided in an embodiment of the present application in the first stop position;
[0043] Figure 3 A schematic diagram of the internal structure of the actuator of the fire protection and smoke exhaust system provided in an embodiment of the present application in the second stop position;
[0044] Figure 4 A schematic diagram of the external structure of the actuator of the fire protection and smoke exhaust system provided in an embodiment of the present application.
[0045] Description of reference numerals:
[0046] 1. Fire and smoke exhaust system;
[0047] 2. Fire smoke exhaust damper;
[0048] 3. Actuator; 301. Rotating shaft; 302. Housing; 3021. Accommodating chamber; 303. Rotating motor; 304. Transmission mechanism; 305. Rotating disk; 3051. Limiting notch; 306. Limiting mechanism; 3061. First mounting shaft; 3062. First rotating member; 3063. First torsion spring; 3064. Limiting column; 3065. Second mounting shaft; 3066. Second rotating member; 3066A. First end; 3066B. Second end; 3066C. Notch; 3067. Linear drive mechanism; 3068. Second torsion spring; 307. Rotation position detection mechanism; 3071. Pressing plate; 3072. Micro switch; 308. Controller; 309. Power supply; 310. Angle plate; 3101. Arc groove; 311. Main torsion spring; 312. Limiting rod; 313. Rotating handle;
[0049] 4. Control panel;
[0050] 5. Leaves. DETAILED DESCRIPTION
[0051] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0052] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0055] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0057] The embodiment of the present application provides a fire prevention and smoke exhaust system 1, please refer to Figures 1 to 4 The fire smoke exhaust system 1 includes an air duct network, a fire smoke exhaust valve 2, an actuator 3 and a control panel 4. The air duct network is laid in a building; the fire smoke exhaust valve 2 is arranged at the pipe mouth of the air duct network, and the fire smoke exhaust valve 2 includes a shell, a control shaft and a blade 5. The shell has a channel connected to the pipe mouth, the control shaft is arranged perpendicular to the extension direction of the channel and is rotatably connected to the shell, and the blade 5 is arranged on the control shaft. When the control shaft rotates, it can drive the blade 5 to rotate together to close or open the channel; the actuator 3 is arranged on the shell, and the actuator 3 has a rotating shaft 301, and the rotating shaft 301 is connected to the control shaft; the control panel 4 is arranged on the wall of the building, and the control panel 4 is communicatively connected to the actuator 3 to control the rotation of the rotating shaft 301.
[0058] Specifically, the control panel 4 mainly includes two functions: fire alarm start and reset.
[0059] In the embodiment of the present application, the fire smoke exhaust system 1 includes an air duct network, a fire smoke exhaust valve 2, an actuator 3 and a control panel 4. The fire smoke exhaust valve 2 includes a shell, a control shaft and a blade 5. The blade 5 is arranged on the control shaft. When the control shaft rotates, it can drive the blade 5 to rotate together to close or open the channel. The actuator 3 is arranged on the shell. The actuator 3 has a rotating shaft 301, and the rotating shaft 301 is connected to the control shaft. The control panel 4 is arranged on the wall of the building, and the control panel 4 is communicatively connected to the actuator 3 to control the rotation of the rotating shaft 301; in this way, the control panel 4 and the actuator 3 are remotely communicated and connected, and the signal transmission speed is fast. The actuator 3 is also directly arranged on the fire smoke exhaust valve 2 and directly connected to the control shaft of the blade 5, thereby improving the response speed and control accuracy of the fire smoke exhaust valve 2.
[0060] In other embodiments, the fire prevention and smoke exhaust system 1 further comprises an alarm mechanism, and when the control mechanism is pressed, the alarm mechanism is activated, and the alarm mechanism can emit sound and light. More specifically, the alarm mechanism flashes red light.
[0061] In one embodiment, please refer to Figure 2 and Figure 3The actuator 3 also includes a housing 302, a rotating motor 303, a transmission mechanism 304, a turntable 305, a limiting mechanism 306, a rotation position detection mechanism 307, a controller 308 and a power supply 309. The housing 302 is formed with a receiving cavity 3021, and the rotating shaft 301 can rotatably penetrate the outside of the housing 302; the rotating motor 303 is arranged in the receiving cavity 3021; the transmission mechanism 304 connects the rotating motor 303 and the rotating shaft 301; the turntable 305 is arranged in the receiving cavity 3021 and is sleeved on the rotating shaft 301, and a limiting notch 3051 is arranged on the edge of the turntable 305, and the turntable 305 has a first stop position and a second stop position. The turntable 305 is in the first stop position and the second stop position. The limiting mechanism 306 is arranged in the accommodating cavity 3021 and acts on the turntable 305, and the limiting mechanism 306 has a locking state of being engaged with the limiting notch 3051 and an unlocking state of exiting the limiting notch 3051; the rotation position detection mechanism 307 is used to detect the rotation position of the rotating shaft 301; the controller 308 is respectively electrically connected to the rotating motor 303, the limiting mechanism 306 and the rotation position detection mechanism 307; the power supply 309 is respectively electrically connected to the rotating motor 303, the limiting mechanism 306, the rotation position detection mechanism 307 and the controller 308; wherein, when the rotation position detection mechanism 307 detects that the turntable 305 rotates to the first stop position, the limiting mechanism 306 switches to the locking state.
[0062] For example, please refer to Figure 2 and Figure 3 , the fire smoke exhaust valve 2 is in a closed state under normal conditions, and the turntable 305 of the present application is in the first stop position under normal conditions; therefore, when the turntable 305 is in the first stop position, the fire smoke exhaust valve 2 is in a closed state; when the turntable 305 is in the second stop position, the fire smoke exhaust valve 2 is in an open state. According to actual needs, when the fire smoke exhaust valve 2 needs to be in an open state under normal conditions, when the turntable 305 is in the first stop position, the fire smoke exhaust valve 2 is in an open state; when the turntable 305 is in the second stop position, the fire smoke exhaust valve 2 is in a closed state. The corresponding relationship between the actuator 3 and the fire smoke exhaust valve 2 is selected according to actual needs, and is not limited here.
[0063] In a specific embodiment, please refer to Figure 2 and Figure 3The limiting mechanism 306 includes a first mounting shaft 3061, a first rotating member 3062, a first torsion spring 3063, a limiting column 3064, a second mounting shaft 3065, a second rotating member 3066 and a linear drive mechanism 3067, wherein the first mounting shaft 3061 is fixed relative to the housing 302; one end of the first rotating member 3062 is rotatably mounted on the first mounting shaft 3061, and the turntable 305 is on the rotation path of the first rotating member 3062; the first torsion spring 3063 is used to make the first rotating member 3062 always have a tendency to rotate in the direction close to the turntable 305; the limiting column 3064 is arranged on the first rotating member 3062 and corresponds to the limiting notch 3051; the second mounting shaft 3065 is fixed relative to the housing 302; the middle part of the second rotating member 3066 is rotatably mounted on the second mounting shaft 3065, and the second rotating member 3066 has a first end 3066A and the second end 3066B, the turntable 305 is on the rotation path of the first end 3066A. During the rotation of the first end 3066A in the direction close to the turntable 305, the first end 3066A can contact with the first rotating member 3062 and drive the first rotating member 3062 to rotate in the direction away from the turntable 305, the limiting column 3064 can exit the limiting notch 3051 to switch the limiting mechanism 306 to the unlocked state. During the rotation of the first end 3066A in the direction away from the turntable 305, the first end 3066A can leave the first rotating member 3062, and the limiting column 3064 can be engaged with the limiting notch 3051 to switch the limiting mechanism 306 to the locked state; the linear drive mechanism 3067 has a driving end, which is rotatably connected to the second end 3066B to drive the second rotating member 3066 to rotate.
[0064] Through the above arrangement, the linear drive mechanism 3067 drives the second rotating member 3066 to rotate, and then the second rotating member 3066 drives the first rotating member 3062 to rotate, and the limiting column 3064 on the first rotating member 3062 can enter and exit the limiting notch 3051 of the turntable 305, and the first rotating member 3062 can conveniently and quickly lock or unlock the turntable 305. The structure of the limiting mechanism 306 is simple, reliable and easy to operate.
[0065] In a more specific embodiment, please refer to Figure 2 and Figure 3 The limiting mechanism 306 also includes a second torsion spring 3068, which is used to ensure that the first end 3066A always has a tendency to rotate in a direction close to the turntable 305, and the linear drive mechanism 3067 is an electromagnet.
[0066] Specifically, when the electromagnet is powered off under normal circumstances, it has magnetism and attracts the second end 3066B, thereby causing the first end 3066A to move away from the first rotating member 3062 under normal circumstances, thereby causing the first rotating member 3062 to lock the turntable 305 under normal circumstances; when the electromagnet is powered on, the second end 3066B is released, and the second rotating member 3066 rotates under the action of the torsion spring, pressing the first rotating member 3062 away from the turntable 305, thereby unlocking the turntable 305.
[0067] In another more specific embodiment, please refer to Figure 2 and Figure 3 In the process of the first end 3066A driving the first rotating member 3062 to rotate in the direction away from the turntable 305, the end face of the first rotating member 3062 is always in contact with the side face of the first end 3066A. The side face of the first end 3066A is provided with a notch 3066C for limiting the first rotating member 3062 from separating from the first end 3066A, thereby preventing the first rotating member 3062 from separating from the first end 3066A and ensuring stable operation of the mechanism.
[0068] Please also refer to Figure 2 and Figure 3 In the process that the first end 3066A drives the first rotating member 3062 to rotate in a direction away from the turntable 305, the first rotating member 3062 and the second rotating member 3066 are always arranged at an acute angle, thereby reducing the difficulty of the second rotating member 3066 driving the first rotating member 3062 to move.
[0069] In another specific embodiment, the transmission mechanism 304 is a gear box. Gear transmission has many advantages such as high transmission accuracy, wide application range, compact structure, reliable operation, long service life and high transmission efficiency.
[0070] In another specific embodiment, please refer to Figure 2 and Figure 3 The rotation position detection mechanism 307 includes a pressure plate 3071 and a micro switch 3072. The pressure plate 3071 is protruded on the circumferential side of the turntable 305. The micro switch 3072 is set on the rotation path of the pressure plate 3071 and is electrically connected to the controller 308. In this way, when the turntable 305 rotates to the first stop position, the pressure plate 3071 triggers the micro switch 3072, and the controller 308 can turn off the rotating motor 303 in time to ensure the accuracy of the rotation of the turntable 305.
[0071] In another specific embodiment, see Figure 4 Both ends of the rotating shaft 301 can rotatably penetrate the outside of the housing 302, and an angle disk 310 for indicating the opening angle of the blade 5 is provided at one end of the rotating shaft 301 away from the control shaft.
[0072] Through the above arrangement, the staff can obtain the state of the fire smoke exhaust damper 2 and the opening angle of the fire smoke exhaust damper 2 by observing the outside of the actuator 3.
[0073] In other embodiments, a rotating handle 313 is further provided on the angle disk 310 . When the electric control system fails, the staff can manually control the fire smoke exhaust valve 2 to open or close by rotating the handle 313 .
[0074] In a more specific embodiment, see Figure 4 The angle disk 310 is provided with an arc groove 3101, and the actuator 3 also includes a main torsion spring 311 and a limit rod 312. The main torsion spring 311 is used to make the turntable 305 always have a tendency to rotate from the first stop position to the second stop position. The limit rod 312 is in the arc groove 3101 and fixed on the housing 302; in this way, during the process of the turntable 305 rotating from the first stop position to the second stop position, the limit rod 312 can contact the end of the arc groove 3101 to stop the turntable 305 from rotating at the second stop position.
[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A fire prevention and smoke exhaust system, characterized in that: include: The air duct network is laid inside the building; A fireproof smoke exhaust valve is arranged at the pipe opening of the air duct network, and comprises a housing, a control shaft and a blade. The housing has a channel connected to the pipe opening, the control shaft is arranged perpendicular to the extension direction of the channel and is rotatably connected to the housing, and the blade is arranged on the control shaft. When the control shaft rotates, the blade can be driven to rotate together to close or open the channel. An actuator, disposed on the housing, the actuator having a rotating shaft connected to the control shaft; as well as A control panel is arranged on the wall of the building, and the control panel is communicatively connected to the actuator to control the rotation of the shaft.
2. The fire prevention and smoke exhaust system according to claim 1, characterized in that: The execution mechanism also includes: A housing is formed with a receiving cavity, and the rotating shaft is rotatably passed through the exterior of the housing; A rotating motor is arranged in the accommodating cavity; A transmission mechanism, connecting the rotating motor and the rotating shaft; A rotating disk is arranged in the accommodating cavity and sleeved on the rotating shaft, a limiting notch is arranged on the edge of the rotating disk, the rotating disk has a first stop position and a second stop position, and the rotating disk rotates between the first stop position and the second stop position; A limiting mechanism, disposed in the accommodating cavity and acting on the rotating disk, the limiting mechanism having a locking state of being engaged with the limiting notch and an unlocking state of exiting the limiting notch; A rotation position detection mechanism, used for detecting the rotation position of the rotating shaft; a controller, electrically connected to the rotating motor, the limiting mechanism and the rotating position detecting mechanism respectively; and A power supply, electrically connected to the rotating motor, the limiting mechanism, the rotating position detection mechanism and the controller respectively; Wherein, when the rotation position detection mechanism detects that the turntable rotates to the first stop position, the limiting mechanism switches to the locking state.
3. The fire prevention and smoke exhaust system according to claim 2, characterized in that: The limiting mechanism comprises: A first mounting shaft, fixed relative to the housing; a first rotating member, one end of which is rotatably mounted on the first mounting shaft, and the rotating disk is located on a rotation path of the first rotating member; a first torsion spring, used to ensure that the first rotating member always has a tendency to rotate in a direction close to the rotating disk; A limiting post, disposed on the first rotating member and corresponding to the limiting notch; A second mounting shaft, fixed relative to the housing; A second rotating member, the middle part of which is rotatably mounted on the second mounting shaft, the second rotating member having a first end and a second end, the rotating disk being on a rotating path of the first end, and in a process in which the first end rotates in a direction close to the rotating disk, the first end can contact with the first rotating member and drive the first rotating member to rotate in a direction away from the rotating disk, the limiting post can withdraw from the limiting notch to switch the limiting mechanism to the unlocking state, and in a process in which the first end rotates in a direction away from the rotating disk, the first end can leave the first rotating member, and the limiting post can be engaged with the limiting notch to switch the limiting mechanism to the locking state; and The linear drive mechanism comprises a driving end, wherein the driving end is rotatably connected to the second end to drive the second rotating member to rotate.
4. The fire prevention and smoke exhaust system according to claim 3, characterized in that: The limiting mechanism further includes a second torsion spring, and the second torsion spring is used to ensure that the first end always has a tendency to rotate in a direction close to the turntable, and the linear drive mechanism is an electromagnet.
5. The fire prevention and smoke exhaust system according to claim 3, characterized in that: When the first end drives the first rotating member to rotate away from the turntable, the end surface of the first rotating member always abuts against the side surface of the first end, and a notch is provided on the side surface of the first end for limiting the first rotating member from separating from the first end.
6. The fire prevention and smoke exhaust system according to claim 5, characterized in that: When the first end drives the first rotating member to rotate in a direction away from the rotating disk, the first rotating member and the second rotating member are always arranged at an acute angle.
7. The fire prevention and smoke exhaust system according to claim 2, characterized in that: The transmission mechanism is a gear box.
8. The fire prevention and smoke exhaust system according to claim 2, characterized in that: The rotation position detection mechanism comprises: A pressure plate, convexly disposed on the circumferential side surface of the rotating disk; and A micro switch is arranged on the rotation path of the pressing plate and is electrically connected to the controller. When the turntable rotates to the first stop position, the pressing plate triggers the micro switch.
9. The fire prevention and smoke exhaust system according to claim 2, characterized in that: Both ends of the rotating shaft can rotatably penetrate the outside of the housing, and an angle disk for indicating the opening angle of the blade is provided at one end of the rotating shaft away from the control shaft.
10. The fire prevention and smoke exhaust system according to claim 9, characterized in that: The angle plate is provided with an arc groove, and the actuator further comprises: a main torsion spring, used to ensure that the turntable always has a tendency to rotate from the first stop position to the second stop position; and A limit rod is located in the arc groove and fixed on the housing. When the turntable rotates from the first stop position to the second stop position, the limit rod can contact the end of the arc groove to stop the turntable from rotating at the second stop position.