Transmission mechanism of unmanned aerial vehicle compressed air foam system, compressed air foam system and unmanned aerial vehicle fire extinguishing equipment
Patent Information
- Application Number
- CN202522639175.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-12
AI Technical Summary
Existing compressed air foam systems for drones have problems such as large size of transmission mechanism, inability to independently control water pump and air compressor operation, and gas-liquid imbalance, making them difficult to integrate into drones. Furthermore, improper startup can easily damage drones.
Two sets of electromagnetic clutches and pulleys are installed on the main drive shaft. The electromagnetic clutches control the engagement of the water pump and air compressor to achieve four working states: neither the water pump nor the air compressor is working, they work separately, and they work simultaneously, which meets different speed ratio requirements. The synchronous pulley design also reduces the installation space.
The compressed air foam system achieves a compact structure and flexible control, improves the gas-liquid ratio accuracy and foam effect, ensures the safety of the drone, and avoids damage to the drone.
Smart Images
Figure CN224931864U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of fire protection equipment technology, specifically relating to a transmission mechanism, a compressed air foam system, and a drone fire extinguishing device. Background Technology
[0002] Firefighting in high-rise buildings has always been a challenge for the fire protection industry. Existing technologies such as aerial ladder trucks and high-pressure water cannon trucks have drawbacks, including long deployment times, large working space requirements, and limited operating height (usually no more than 100 meters), making them ineffective in dealing with high-rise fires. Drone-based firefighting, as an emerging solution, shows great potential, but it places extremely high demands on the size, weight, and controllability of the equipment it carries. Compressed air foam systems (CAFS) are core equipment for efficient firefighting, typically including a water pump, air compressor, foam pump, and transmission mechanism. Current transmission methods usually involve the main drive shaft directly driving the water pump, while the air compressor is connected to the main drive shaft via a pulley or transfer case. This approach has several drawbacks: 1. It requires a large installation space, resulting in an excessively large system that is difficult to integrate onto a drone; 2. The air compressor and water pump must operate simultaneously, preventing the water pump from operating independently, resulting in compressed air in the pipeline during pump operation; 3. The rated operating speeds of the water pump and air compressor are difficult to match, causing gas-liquid imbalance and poor foaming effect. Furthermore, drone-based firefighting places high demands on the compressed air foam system. The water pump, foam pump, and air compressor must be started sequentially, not simultaneously. Simultaneous starting would prevent the drone from properly dispensing foam at high altitudes due to excessive water content in the initial foam, and could easily lead to a drone crash. Therefore, there is an urgent need to develop a compact, highly controllable transmission mechanism for a compressed air foam system that is adaptable to drone platforms. Summary of the Invention
[0003] This utility model aims to overcome the shortcomings of the prior art and provides a transmission mechanism for a drone compressed air foam system, a compressed air foam system, and a drone fire extinguishing device.
[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: The transmission mechanism of the UAV compressed air foam system includes a main drive shaft (5), a fire pump (1) driven by the main drive shaft (5), and a screw air compressor (7). The main drive shaft (5) is equipped with a fire pump electromagnetic clutch (3) and a screw air compressor electromagnetic clutch (9). The fire pump electromagnetic clutch (3) and the screw air compressor electromagnetic clutch (9) are synchronous belt pulley type clutches. The fire pump (1) is connected to the fire pump electromagnetic clutch (3) through a synchronous belt (4), and the screw air compressor (7) is connected to the screw air compressor electromagnetic clutch (9) through a synchronous belt (4).
[0005] Preferably, the fire pump (1) and the screw air compressor (7) are respectively arranged on the left and right sides of the main drive shaft (5).
[0006] More preferably, the fire pump electromagnetic clutch (3) includes a fire pump electromagnetic clutch synchronous pulley (6); the screw air compressor electromagnetic clutch (9) includes a screw air compressor electromagnetic clutch synchronous pulley (8).
[0007] More preferably, the fire pump (1) is provided with a fire pump synchronization wheel (2); the screw air compressor (7) is provided with a screw air compressor synchronization wheel (10).
[0008] More preferably, the fire pump synchronous pulley (2) is connected to the fire pump electromagnetic clutch synchronous pulley (6) via a synchronous belt (4); the screw air compressor synchronous pulley (10) is connected to the screw air compressor electromagnetic clutch synchronous pulley (8) via a synchronous belt (4).
[0009] More preferably, the number of teeth of the synchronous pulley (6) of the fire pump electromagnetic clutch is different from the number of teeth of the synchronous pulley (8) of the screw air compressor electromagnetic clutch; the number of teeth of the synchronous pulley (2) of the fire pump is different from the number of teeth of the synchronous pulley (10) of the screw air compressor.
[0010] More preferably, the fire pump synchronous pulley (2), synchronous belt (4) and fire pump electromagnetic clutch synchronous pulley (6) form a fire pump synchronous pulley mechanism, and the screw air compressor synchronous pulley (10), synchronous belt (4) and screw air compressor electromagnetic clutch synchronous pulley (8) form a screw air compressor synchronous pulley mechanism; the transmission ratios of the fire pump synchronous pulley mechanism and the screw air compressor synchronous pulley mechanism are different.
[0011] Preferably, the main drive shaft (5) is provided with bearing seats at both ends for fixing the transmission mechanism.
[0012] This invention also provides a compressed air foam system, which includes the aforementioned transmission mechanism of this invention.
[0013] This utility model also provides a drone fire extinguishing device, which is equipped with the aforementioned compressed air foam system of this invention.
[0014] The present invention will be further described below: This invention features two sets of electromagnetic clutches and two sets of pulleys mounted on a main drive shaft, fixed at both ends by bearing seats. A water pump and an air compressor are simultaneously driven on this main drive shaft, and the two sets of pulleys are controlled by the engagement of the electromagnetic clutches. This allows for independent control of the two different components (water pump and air compressor), enabling four operating states: neither water pump nor air compressor is operating; water pump and air compressor are operating; water pump and air compressor are operating; and both water pump and air compressor are operating. These four operating states enhance the system's flexibility and versatility. The air compressor and water pump are positioned on opposite sides of the main drive shaft, reducing the overall installation height. Different speed ratios for the water pump and air compressor can be designed using the number of teeth on the two sets of synchronous pulleys, meeting the gas-liquid ratio requirements of compressed air foam systems.
[0015] Compared with the prior art, this utility model has significant advantages: Existing technology uses a drive shaft to directly drive the water pump, requiring the drive shaft's rotational speed to match the pump's. This makes configuring the drive shaft and pump difficult, typically requiring a gearbox to be added to the pump, increasing its size. This invention uses a single main drive shaft with two sets of synchronous pulleys to drive the water pump and air compressor separately. This satisfies the different speed ratio requirements of the pump and compressor, and the speed ratio accuracy is very high, resulting in a high gas-liquid ratio accuracy and ultimately, excellent foaming effect.
[0016] Existing technology requires water pumps to have gearboxes, which significantly increases the pump's height. When integrated into a compressed air foam system, the overall structural frame is quite large, making it unsuitable for installation on lightweight unmanned fire trucks. This invention, however, utilizes synchronous pulleys on the main drive shaft to mount the water pump and air compressor on either side of the drive shaft, resulting in a more convenient and compact installation. Ultimately, the system can be installed on various lightweight unmanned fire trucks.
[0017] Existing technology uses a drive shaft to directly drive the water pump, and then the air compressor is connected to the main drive shaft via a synchronous pulley or transfer case. This means that when the power unit starts, the water pump and air compressor work simultaneously, easily creating a water flow pulsation effect, which is extremely harmful to drones. This invention, however, uses an electromagnetic clutch to control the engagement of the water pump and air compressor. It allows the water pump and air compressor to start sequentially according to control logic. Compressed air is injected only after the foam liquid is properly mixed, resulting in a smoother foam output and better foaming effect. Simultaneously, the system is safer; in the event of a drone malfunction, the foam system can be shut down in an emergency by disengaging the clutch.
[0018] In summary, this utility model achieves a small installation space and allows the water pump, foam pump, and air compressor to be started independently through an innovative transmission mechanism design. Attached Figure Description
[0019] Figure 1 This is a top view of the structure of this utility model; Figure 2 This is a schematic diagram of the main drive shaft in this utility model; Figure 3 This is a front view structural diagram of the present utility model.
[0020] In the diagram: 1. Fire pump; 2. Fire pump synchronizer pulley; 3. Fire pump electromagnetic clutch; 4. Synchronous belt; 5. Main drive shaft; 6. Fire pump electromagnetic clutch synchronizer pulley; 7. Screw air compressor; 8. Screw air compressor electromagnetic clutch synchronizer pulley; 9. Screw air compressor electromagnetic clutch; 10. Screw air compressor synchronizer pulley. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1
[0022] See Figures 1 to 3 The transmission mechanism of the UAV compressed air foam system includes a main drive shaft 5, a fire pump 1 driven by the main drive shaft 5, and a screw air compressor 7. The main drive shaft 5 is equipped with a fire pump electromagnetic clutch 3 and a screw air compressor electromagnetic clutch 9. The fire pump electromagnetic clutch 3 and the screw air compressor electromagnetic clutch 9 are synchronous belt pulley type clutches. The fire pump 1 is connected to the fire pump electromagnetic clutch 3 through a synchronous belt 4, and the screw air compressor 7 is connected to the screw air compressor electromagnetic clutch 9 through a synchronous belt 4.
[0023] The fire pump 1 and the screw air compressor 7 are respectively arranged on the left and right sides of the main drive shaft 5. The fire pump electromagnetic clutch 3 includes a fire pump electromagnetic clutch synchronous pulley 6; the screw air compressor electromagnetic clutch 9 includes a screw air compressor electromagnetic clutch synchronous pulley 8. The fire pump 1 is equipped with a fire pump synchronous pulley 2; the screw air compressor 7 is equipped with a screw air compressor synchronous pulley 10. The fire pump synchronous pulley 2 is connected to the fire pump electromagnetic clutch synchronous pulley 6 via a synchronous belt 4; the screw air compressor synchronous pulley 10 is connected to the screw air compressor electromagnetic clutch synchronous pulley 8 via a synchronous belt 4. The number of teeth on the fire pump electromagnetic clutch synchronous pulley 6 is different from the number of teeth on the screw air compressor electromagnetic clutch synchronous pulley 8; the number of teeth on the fire pump synchronous pulley 2 is different from the number of teeth on the screw air compressor synchronous pulley 10. The fire pump synchronous pulley 2, synchronous belt 4, and fire pump electromagnetic clutch synchronous pulley 6 form a fire pump synchronous belt pulley mechanism; the screw air compressor synchronous pulley 10, synchronous belt 4, and screw air compressor electromagnetic clutch synchronous pulley 8 form a screw air compressor synchronous belt pulley mechanism; the transmission ratios of the fire pump synchronous belt pulley mechanism and the screw air compressor synchronous belt pulley mechanism are different. Bearing seats for fixing the transmission mechanism are provided at both ends of the main drive shaft 5. Example 2
[0024] A compressed air foam system comprising the transmission mechanism described in Example 1. Example 3
[0025] A drone fire extinguishing device, wherein the drone fire extinguishing device is equipped with the compressed air foam system described in Example 2.
Claims
1. A transmission mechanism for a compressed air foam system for unmanned aerial vehicles (UAVs), characterized in that, The transmission mechanism includes a main drive shaft (5), a fire pump (1) driven by the main drive shaft (5), and a screw air compressor (7). The main drive shaft (5) is equipped with a fire pump electromagnetic clutch (3) and a screw air compressor electromagnetic clutch (9). The fire pump electromagnetic clutch (3) and the screw air compressor electromagnetic clutch (9) are synchronous belt pulley type clutches. The fire pump (1) is connected to the fire pump electromagnetic clutch (3) through a synchronous belt (4), and the screw air compressor (7) is connected to the screw air compressor electromagnetic clutch (9) through a synchronous belt (4).
2. The transmission mechanism of the UAV compressed air foam system as described in claim 1, characterized in that, The fire pump (1) and the screw air compressor (7) are respectively arranged on the left and right sides of the main drive shaft (5).
3. The transmission mechanism of the UAV compressed air foam system as described in claim 2, characterized in that, The fire pump electromagnetic clutch (3) includes a fire pump electromagnetic clutch synchronous pulley (6); the screw air compressor electromagnetic clutch (9) includes a screw air compressor electromagnetic clutch synchronous pulley (8).
4. The transmission mechanism of the UAV compressed air foam system as described in claim 3, characterized in that, The fire pump (1) is equipped with a fire pump synchronous pulley (2); the screw air compressor (7) is equipped with a screw air compressor synchronous pulley (10).
5. The transmission mechanism of the UAV compressed air foam system as described in claim 4, characterized in that, The fire pump synchronous pulley (2) is connected to the fire pump electromagnetic clutch synchronous pulley (6) via a synchronous belt (4); the screw air compressor synchronous pulley (10) is connected to the screw air compressor electromagnetic clutch synchronous pulley (8) via a synchronous belt (4).
6. The transmission mechanism of the UAV compressed air foam system as described in claim 5, characterized in that, The number of teeth of the synchronous pulley (6) of the electromagnetic clutch of the fire pump is different from the number of teeth of the synchronous pulley (8) of the electromagnetic clutch of the screw air compressor; the number of teeth of the synchronous pulley (2) of the fire pump is different from the number of teeth of the synchronous pulley (10) of the screw air compressor.
7. The transmission mechanism of the UAV compressed air foam system as described in claim 6, characterized in that, The fire pump synchronous pulley (2), synchronous belt (4) and fire pump electromagnetic clutch synchronous pulley (6) form a fire pump synchronous pulley mechanism, and the screw air compressor synchronous pulley (10), synchronous belt (4) and screw air compressor electromagnetic clutch synchronous pulley (8) form a screw air compressor synchronous pulley mechanism; the transmission ratios of the fire pump synchronous pulley mechanism and the screw air compressor synchronous pulley mechanism are different.
8. The transmission mechanism of the UAV compressed air foam system according to any one of claims 1 to 7, characterized in that, The main drive shaft (5) is provided with bearing seats at both ends for fixing the transmission mechanism.
9. A compressed air foam system, characterized in that, The compressed air foam system includes the transmission mechanism as described in claim 8.
10. A drone-based firefighting device, characterized in that, The unmanned aerial vehicle (UAV) firefighting equipment is equipped with the compressed air foam system as described in claim 8.