Air return prevention device of smoke exhaust fan

Abstract

The utility model relates to the technical field of smoke exhaust fans, and discloses a smoke exhaust fan air return prevention device which comprises a mounting base, a smoke exhaust pipe is fixedly mounted on the mounting base, a supporting plate is fixedly mounted on the smoke exhaust pipe, a smoke exhaust mechanism is fixedly mounted on the supporting plate, and two sets of check blocks are fixedly mounted on the inner wall of the smoke exhaust pipe. Baffles are arranged below the check blocks. Wind power generated by driving the exhaust fan through the motor can drive the two baffles to rotate, so that indoor smoke is exhausted, when the external wind pressure is larger than the wind power of the exhaust fan, the two baffles are driven to rotate reversely, the baffles are limited through the check blocks, the two baffles are kept in a parallel state, and therefore the indoor smoke is exhausted. The device is simple in structure, the device does not need to be frequently maintained, and the practicability of the device is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of smoke exhaust fans, and in particular to a smoke exhaust fan anti-backwind device. Background Art

[0002] Smoke exhaust fan is a device used to remove smoke, odor or harmful gases generated inside a building. It mainly generates strong wind to quickly exhaust the indoor dirty air to the outside to keep the indoor air fresh and safe.

[0003] In a Chinese patent with application number 202221079205.X, a smoke exhaust fan anti-backwind device is disclosed, which uses strong wind to cause the axial flow blades to reverse. At this time, the axial flow blades drive the rotating shaft to reverse. At this time, the inner ring and outer ring of the one-way bearing are stuck, and the rotating shaft can drive the gear to rotate through the one-way bearing. The gear drives the rack to move by meshing with the rack. One end of the rack hits the travel switch, thereby generating a signal; when the signal of the travel switch is received, the push rod motor drives the baffle to rotate, and the baffle blocks the air outlet of the smoke exhaust duct, thereby preventing backwind.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the inner and outer rings of the one-way bearing of the above-mentioned device often need to be stuck during use, and manual maintenance is required regularly, otherwise the one-way bearing is prone to damage, causing the device to malfunction, and lacks certain practicality.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] In order to solve the problem that one-way bearings need to be frequently maintained manually, otherwise they are easily damaged, causing device failure and lacking certain practicality, the present application provides a smoke exhaust fan anti-backwind device.

[0007] The smoke exhaust fan anti-return air device provided in this application adopts the following technical solution:

[0008] A smoke exhaust fan anti-backwind device comprises a mounting base, a smoke exhaust pipe is fixedly mounted on the mounting base, a support plate is fixedly mounted on the smoke exhaust pipe, a smoke exhaust mechanism is fixedly mounted on the support plate, two groups of blocks are fixedly mounted on the inner wall of the smoke exhaust pipe, and baffles are arranged below the blocks.

[0009] Preferably, the smoke exhaust mechanism comprises a protection box fixedly mounted on the support plate, a motor is fixedly mounted in the protection box, and an output end of the motor extends to the smoke exhaust pipe where an exhaust fan is mounted.

[0010] Preferably, two groups of support rods are symmetrically installed on the inner wall of the smoke exhaust pipe, and the baffle is rotatably installed on the support rods, and two groups of limit blocks cooperating with the baffle are symmetrically installed on the inner wall of the smoke exhaust pipe.

[0011] Preferably, two groups of support blocks are fixedly mounted on the baffle, a support frame is movably mounted on the support block via a rotating shaft, and a roller in contact with the baffle is movably mounted on the support frame.

[0012] Preferably, two groups of transverse plates are symmetrically installed on the inner wall of the smoke exhaust pipe, and springs connected to the transverse plates are fixedly installed on the support frame, and when the springs are in a natural state, the baffles are in a horizontal state.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] The wind force generated by the exhaust fan driven by the motor will drive the two sets of baffles to rotate, thereby discharging indoor smoke. When the external wind pressure is greater than the wind force of the exhaust fan, the two sets of baffles will be driven to rotate in the opposite direction. The baffles are limited by the block so that the two sets of baffles remain parallel, thereby blocking the smoke exhaust pipe to prevent backflow. The device has a simple structure and does not require frequent maintenance, which enhances the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a three-dimensional structure from a first-view perspective of an embodiment of the application;

[0016] Figure 2 is a cross-sectional view of an exhaust duct according to an embodiment of the application;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the limit block of the embodiment of the application;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the support frame of the application embodiment.

[0019] Explanation of the accompanying drawings: 1. Mounting base; 2. Smoke exhaust pipe; 3. Support plate; 4. Block; 5. Baffle; 6. Protective box; 7. Motor; 8. Exhaust fan; 9. Support rod; 10. Limit block; 11. Support block; 12. Support frame; 13. Roller; 14. Cross plate; 15. Spring. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4 This application is described in further detail.

[0021] The present application embodiment discloses a smoke exhaust fan backflow prevention device. Figure 1-4, a smoke exhaust fan anti-backwind device, comprising a mounting base 1, a smoke exhaust pipe 2 is fixedly mounted on the mounting base 1, a support plate 3 is fixedly mounted on the smoke exhaust pipe 2, a smoke exhaust mechanism is fixedly mounted on the support plate 3, two groups of blockers 4 are fixedly mounted on the inner wall of the smoke exhaust pipe 2, baffles 5 are arranged below the blockers 4, the smoke exhaust mechanism comprises a protection box 6 fixedly mounted on the support plate 3, a motor 7 is fixedly mounted in the protection box 6, an output end of the motor 7 extends to the smoke exhaust pipe 2 where an exhaust fan 8 is installed, two groups of support rods 9 are symmetrically mounted on the inner wall of the smoke exhaust pipe 2, and the baffles 5 are rotatably mounted on the support rods 9, and two groups of limit blocks 10 cooperating with the baffles 5 are symmetrically mounted on the inner wall of the smoke exhaust pipe 2;

[0022] By adopting the above technical solution, the exhaust fan is driven by the motor 7 to rotate and the indoor smoke is sucked into the smoke exhaust pipe 2. Since the baffle 5 and the spring 15 are in a balanced state, when the exhaust fan generates wind, it will drive the two groups of baffles 5 to rotate, thereby making the exhaust pipe in a smooth state, thereby exhausting the indoor smoke. At the same time, the two groups of baffles 5 are limited by the limit block 10 to prevent the baffles 5 from being in a vertical state, which makes it impossible to prevent backflow.

[0023] Reference Figure 2-4 Two groups of support blocks 11 are fixedly mounted on the baffle 5, a support frame 12 is movably mounted on the support block 11 through a rotating shaft, a roller 13 in contact with the baffle 5 is movably mounted on the support frame 12, two groups of horizontal plates 14 are symmetrically mounted on the inner wall of the smoke exhaust pipe 2, a spring 15 connected to the horizontal plate 14 is fixedly mounted on the support frame 12, and when the spring 15 is in a natural state, the baffle 5 is in a horizontal state;

[0024] By adopting the above technical solution, when the external wind pressure is greater than the wind force of the exhaust fan, the two groups of baffles 5 will be driven to rotate in the opposite direction, and the baffles 5 will be limited by the block 4 so that the two groups of baffles 5 remain in a parallel state, thereby blocking the smoke exhaust pipe 2 to prevent backflow. Through the action of the roller 13 and the support frame 12, the spring 15 can be in a vertical state, so that the baffle 5 can rotate more smoothly.

[0025] The implementation principle of the smoke exhaust fan anti-backwind device in the embodiment of the present application is: start the motor 7, and drive the exhaust fan to rotate through the motor 7 to suck the indoor smoke into the smoke exhaust pipe 2. Since the baffle 5 and the spring 15 are in a balanced state, when the exhaust fan generates wind force, it will drive the two groups of baffles 5 to rotate, thereby making the exhaust pipe in a smooth state, thereby exhausting the indoor smoke. When the external wind pressure is greater than the wind force of the exhaust fan, it will drive the two groups of baffles 5 to rotate in the opposite direction, and the baffle 5 is limited by the block 4, so that the two groups of baffles 5 remain in a parallel state, thereby blocking the smoke exhaust pipe 2 to prevent backwind. The device has a simple structure and does not require frequent maintenance, thereby enhancing the practicality of the device.

[0026] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0027] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0028] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A smoke exhaust fan backflow prevention device, comprising a mounting base (1), a smoke exhaust pipe (2) fixedly mounted on the mounting base (1), a support plate (3) fixedly mounted on the smoke exhaust pipe (2), a smoke exhaust mechanism fixedly mounted on the support plate (3), characterized in that: Two groups of blocks (4) are fixedly mounted on the inner wall of the smoke exhaust pipe (2), and baffles (5) are arranged below the blocks (4). Two groups of support blocks (11) are fixedly mounted on the baffles (5), and a support frame (12) is movably mounted on the support block (11) via a rotating shaft, and a roller (13) in contact with the baffles (5) is movably mounted on the support frame (12). Two groups of transverse plates (14) are symmetrically mounted on the inner wall of the smoke exhaust pipe (2), and a spring (15) connected to the transverse plate (14) is fixedly mounted on the support frame (12), and when the spring (15) is in a natural state, the baffles (5) are in a horizontal state.

2. The smoke exhaust fan backflow prevention device according to claim 1, characterized in that: The smoke exhaust mechanism comprises a protection box (6) fixedly mounted on the support plate (3), a motor (7) fixedly mounted in the protection box (6), and an output end of the motor (7) extending to the smoke exhaust pipe (2) where an exhaust fan (8) is mounted.

3. A smoke exhaust fan backflow prevention device according to claim 2, characterized in that: Two groups of support rods (9) are symmetrically mounted on the inner wall of the smoke exhaust pipe (2), and the baffle (5) is rotatably mounted on the support rods (9). Two groups of limit blocks (10) cooperating with the baffle (5) are symmetrically mounted on the inner wall of the smoke exhaust pipe (2).

Images