Multi-blade smoke exhaust fireproof valve

Abstract

The utility model relates to the technical field of fire-fighting ventilation pipelines, in particular to a multi-blade smoke exhaust fireproof valve which comprises a valve body and a plurality of rotating shafts rotationally connected with the valve body, blades are symmetrically arranged on the two sides of each rotating shaft, a temperature sensor is arranged in the valve body, and one end of each rotating shaft extends and penetrates through the valve body to be connected with a driving assembly. The driving assembly comprises a plurality of rotating blocks and a transverse rod, the tail ends of one sides of the rotating blocks are connected with the rotating shaft, a plurality of limiting columns are arranged on the transverse rod, long round holes are correspondingly formed in the rotating blocks, the limiting columns are located on the inner sides of the long round holes, and a linear motion mechanism used for driving the transverse rod to move horizontally is connected to the transverse rod. Complex mechanical parts are omitted, so that the whole transmission process is smoother, the mechanical failure rate is reduced, the overall production and maintenance cost of equipment is reduced, and the transmission device is suitable for various different types of buildings and places, especially large public buildings and places.

Description

Technical Field

[0001] This utility model relates to the field of fire ventilation duct technology, specifically a multi-leaf smoke exhaust fire damper. Background Technology

[0002] As a fire protection component, smoke exhaust fire dampers are generally installed on the ducts of mechanical smoke exhaust systems, connected to fire-fighting air ducts. Normally open, they function to exhaust smoke during a fire. When the smoke temperature in the exhaust duct reaches a threshold, the smoke exhaust fire damper closes, meeting the requirements for smoke leakage and fire resistance integrity for a certain period, thus acting as a smoke and fire barrier. When selecting the specifications of a smoke exhaust fire damper, factors such as the floor level, building area, and floor height should be considered comprehensively. Generally, larger buildings require larger smoke exhaust fire dampers with more blades, resulting in better smoke extraction.

[0003] However, most of the mechanical mechanisms used to drive the blades of current smoke exhaust fire dampers are quite complex. For example, in a smoke exhaust fire damper disclosed in patent CN221922153U, a gear and rack transmission mechanism is used to drive the blades to rotate. In another example, in a multi-leaf fire exhaust smoke damper disclosed in patent CN220540401U, a pulley and belt transmission mechanism is used to drive the blades to rotate. Although the above design schemes can basically meet the functional requirements of fire prevention and smoke exhaust, when there are many blades in the smoke exhaust fire damper, the complexity of its structure often leads to increased maintenance difficulty, more complex transmission process, and a corresponding increase in failure rate. At the same time, the production cost is also higher. Therefore, the above design schemes are particularly unsuitable for multi-leaf smoke exhaust fire dampers in large places. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-leaf smoke exhaust fire damper that addresses the shortcomings of existing technologies. By using a simple drive component to drive all the leaves to rotate simultaneously, the multi-leaf smoke exhaust fire damper can be closed. This solves the problems of existing smoke exhaust fire dampers, where the mechanical mechanism used to drive the leaves to rotate is relatively complex, the complexity of the structure often leads to increased maintenance difficulty and a corresponding increase in the failure rate, and the production cost is also high, making them unsuitable for large venues.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-leaf smoke exhaust fire damper includes a valve body and multiple rotating shafts rotatably connected to the valve body. The rotating shafts have symmetrically arranged blades on both sides. A temperature sensor is installed inside the valve body. One end of the rotating shaft extends through the valve body and is connected to a drive assembly. The drive assembly includes multiple rotating blocks and a crossbar. One end of each rotating block is connected to the rotating shaft. The crossbar has multiple limiting posts, and corresponding elongated holes are opened on the rotating blocks. The limiting posts are movably connected to the inside of the elongated holes of the rotating blocks. A linear motion mechanism for driving the crossbar to move horizontally is connected to the crossbar.

[0007] Furthermore, the linear motion mechanism includes an electric push rod, the extended end of which is connected to the crossbar.

[0008] Furthermore, the valve body is provided with a horizontal groove, and the crossbar is slidably connected to the valve body in the horizontal direction through the groove.

[0009] Furthermore, the drive assembly also includes a controller and a limit switch, the controller being electrically connected to the temperature sensor, the limit switch, and the electric actuator, respectively.

[0010] Furthermore, the limit switch is located at the end of the rotation path of the rotating rod.

[0011] Furthermore, the valve body is provided with a control compartment, and the drive assembly is located inside the control compartment.

[0012] Furthermore, the control compartment is detachably connected to a compartment cover.

[0013] Furthermore, the blade is provided with reinforcing ribs.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention features multiple limiting posts on a crossbar, with corresponding elongated holes on each rotating block connected to a rotating shaft. Each rotating block is movably connected to the crossbar, and an electric push rod drives the crossbar to move horizontally, causing all rotating blocks to rotate around their respective shafts. This simultaneous rotation of all blades achieves the closing action of the smoke exhaust fire damper. This invention eliminates complex mechanical parts, resulting in a smoother transmission process, reduced mechanical failure rate, and lower overall production and maintenance costs. It is suitable for various types of buildings and locations, especially large public buildings and locations. Furthermore, the drive assembly is concealed within a control compartment above the valve body, providing an external protection layer to ensure normal operation in emergency situations such as fires. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a multi-leaf smoke exhaust fire damper provided by this utility model;

[0017] Figure 2 A schematic diagram of the structure inside the control compartment of a multi-leaf smoke exhaust fire damper provided by this utility model;

[0018] Figure 3 A top view of a multi-leaf smoke exhaust fire damper provided by this utility model when the valve body is in the open state;

[0019] Figure 4 A top view of a multi-leaf smoke exhaust fire damper provided by this utility model when the valve body is in the closed state;

[0020] Figure 5 This utility model provides a schematic diagram of the structure of the blades in a multi-leaf smoke exhaust fire damper.

[0021] The attached figures are labeled as follows:

[0022] 1. Valve body; 2. Rotating shaft; 3. Blade; 31. Reinforcing rib; 4. Temperature sensor; 5. Rotating block; 6. Crossbar; 7. Limiting post; 8. Oblong hole; 9. Electric push rod; 10. Slide groove; 11. Extension rod; 12. Controller; 13. Limit switch; 14. Control compartment; 15. Compartment cover. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] For easier understanding, please refer to Figures 1 to 4 This embodiment provides a multi-leaf smoke exhaust fire damper, including a valve body 1. Multiple vertical rotating shafts 2 are horizontally spaced inside the valve body 1. The upper and lower ends of the rotating shafts 2 are rotatably connected to the upper and lower walls of the valve body 1, respectively. Blades 3 are symmetrically and fixedly mounted on both sides of the rotating shafts 2. A temperature sensor 4 is installed inside the valve body 1. The upper end of the rotating shaft 2 extends to be rotatably connected to the upper wall of the valve body 1, then passes through the valve body 1 and is fixedly connected to a rotating block 5 in the drive assembly. The connection point between the rotating shaft 2 and the rotating block 5 is located at one end of the rotating block 5. The drive assembly also includes a horizontally placed crossbar 6. Multiple vertical limiting posts 7 are provided on the crossbar 6. Elongated holes 8 are correspondingly provided on the rotating block 5 for the limiting posts 7 to be inserted into. The limiting posts 7 are movably connected to the inside of the elongated holes 8. An extension rod 11 extends horizontally from the middle of the crossbar 6. The extension rod 11 is connected to the moving end of a linear motion mechanism, which drives the crossbar 6 to move horizontally. It should be noted that the number of rotating shaft 2, rotating block 5 and limiting post 7 are the same.

[0028] In the initial state, valve body 1 is in the open state, that is, all blades 3 are parallel to the left and right side walls of valve body 1. When the temperature sensor 4 senses that the airflow temperature inside valve body 1 exceeds the threshold, the linear motion mechanism is activated. The linear motion mechanism drives the extension rod 11 and the crossbar 6 to move in the horizontal direction. Since the limiting post 7 is movably connected to the inside of the elongated hole 8, and one end of the rotating block 5 is fixedly connected to the rotating shaft 2, when the crossbar 6 moves in the horizontal direction, it drives the rotating block 5 to rotate around the rotating shaft 2 as the center. This causes the rotating block 5 to synchronously drive the rotating shaft 2 to rotate around itself as the center. Finally, the blades 3 located on both sides of the rotating shaft 2 rotate until the blades 3 overlap each other, that is, the blades 3 are perpendicular to the left and right side walls of valve body 1, and valve body 1 completes the closing action.

[0029] For better understanding, please continue reading. Figures 1 to 4The linear motion mechanism includes an electric push rod 9 fixed above the valve body 1, with its extended end fixedly connected to an extension rod 11. A horizontal groove 10 is provided above the upper wall of the valve body 1, through which the crossbar 6 is slidably connected to the valve body 1 in the horizontal direction. The groove 10 further ensures that the crossbar 6 moves horizontally. The drive assembly also includes a controller 12 and a limit switch 13. The controller 12 is electrically connected to the temperature sensor 4, the limit switch 13, and the electric push rod 9. When the temperature sensor 4 senses that the airflow temperature inside the valve body 1 exceeds a threshold, the temperature sensor 4 transmits an electrical signal to the controller 12, which then drives the electric push rod 9 to start, i.e., the electric push rod 9 begins to move the crossbar 6 horizontally. When the limit switch 13 is pressed, the limit switch 13 transmits an electrical signal to the controller 12, which then drives the electric push rod 9 to stop, i.e., the crossbar 6 stops moving. Limit switch 13 is fixedly set at the end of the rotation path of the rotating block 5 on the side opposite to the connection point of the rotating shaft 2 (the position of the rotating block 5 on the side opposite to the connection point of the rotating shaft 2 after rotating 90° with the rotating shaft 2 as the center). That is, when the rotating block 5 on the side opposite to the connection point of the rotating shaft 2 rotates to the end of its rotation path, the side wall of the rotating block 5 on the side opposite to the connection point of the rotating shaft 2 will touch and press the limit switch 13, thereby stopping the extension action of the electric push rod 9. At this time, the blade 3 and the left and right side walls of the valve body 1 are perpendicular to each other, that is, the valve body 1 completes the closing action.

[0030] For easier understanding, please refer to Figures 1 to 5A control chamber 14 is located on the upper wall of the valve body 1, and the drive assembly is located inside the control chamber 14 to prevent external factors from affecting the normal operation of the drive assembly. A cover 15 is detachably connected to the top of the control chamber 14 for easy periodic maintenance of the drive assembly. Furthermore, the cover 15 is slidably connected to the side wall of the control chamber 14 in the horizontal direction, and the control chamber 14 has multiple screw holes, with the same number of through holes on the cover 15. After the cover 15 slides from right to left to cover the top of the control chamber 14, it is vertically fixed to the control chamber 14 by bolts. Moreover, the control chamber 14 and cover 15 are made of the same material and have the same surface treatment as the valve body 1. The surface treatment can be an anti-rust primer and fire-retardant paint applied to both the inner and outer surfaces, providing good fire resistance and further ensuring that the drive assembly inside the control chamber 14 can operate normally in the event of a fire. All blades 3 are provided with figure-eight reinforcing ribs 31. When the temperature sensor 4 senses that the airflow temperature inside the valve body 1 exceeds the threshold, the drive assembly will drive the blade 3 to rotate, causing the valve body 1 to complete the closing action. At this time, if the fire is more serious, the smoke in the pipeline will squeeze the blade 3 due to excessive pressure, which may cause the internal smoke to squeeze the blade 3 to bend, thus causing the fire to spread from the bend of the blade 3. By adding a figure-eight-shaped reinforcing rib 31 to the blade 3, the inventor effectively improves the hardness and bending resistance of the blade 3 itself, avoids the bending of the blade 3 due to excessive smoke pressure, and further ensures that the valve body 1 can play a role in smoke and fire prevention after completing the closing action.

[0031] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A multi-leaf smoke exhaust fire damper, comprising a valve body (1) and a plurality of rotating shafts (2) respectively connected with the valve body (1), the rotating shafts (2) are symmetrically provided with leaves (3) on both sides, and a temperature sensor (4) is arranged in the valve body (1), characterized in that, One end of the rotating shaft (2) extends through the valve body (1) and is connected with a driving assembly, the driving assembly comprises a plurality of rotating blocks (5) and a cross bar (6), one end of the rotating block (5) is connected with the rotating shaft (2), a plurality of limiting columns (7) are arranged on the cross bar (6), a long circular hole (8) is arranged on the rotating block (5) correspondingly, the limiting column (7) is located in the inside of the long circular hole (8), and a linear motion mechanism for driving the cross bar (6) to move horizontally is connected with the cross bar (6).

2. The multi-leaf smoke control damper of claim 1, wherein, The linear motion mechanism comprises an electric push rod (9), and the extending end of the electric push rod (9) is connected with the cross bar (6).

3. The multi-leaf smoke control damper of claim 2, wherein, A horizontal sliding groove (10) is arranged on the valve body (1), and the cross bar (6) is slidably connected with the valve body (1) in the horizontal direction through the sliding groove (10).

4. The multi-leaf smoke control damper of claim 2, wherein, The driving assembly further comprises a controller (12) and a travel switch (13), and the controller (12) is electrically connected with the temperature sensor (4), the travel switch (13) and the electric push rod (9) respectively.

5. The multi-leaf smoke control damper of claim 4, wherein, The travel switch (13) is located at the end point of the rotating path of the rotating rod.

6. The multi-leaf smoke control damper of claim 1, wherein, A control bin (14) is arranged on the valve body (1), and the driving assembly is located in the control bin (14).

7. The multi-leaf smoke control damper of claim 6, wherein, The control bin (14) is detachably connected with a bin cover (15).

8. The multi-leaf smoke control damper of any of claims 1-7, wherein, The blade (3) is provided with a reinforcing rib (31).

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