Patent ID: 12209770

In the drawings:1—cowl body;11—top cap;12—bottom ring;13—fan blade;2—base;21—variable-angle pipe neck;22—waterproof base;3—screw;4—upper support;5—lower support;6—lifting mechanism;61—lifting plate;62—electric pushing rod;63—lifting shaft;7—pressure sensor;8—control box;9—thermoelectric generator;901—hot end;902—cold end;903—output end;10—storage battery.

DETAILED DESCRIPTION

The present disclosure is further described below with reference to the accompanying drawings and embodiments, which are not intended to limit the present disclosure.

As shown inFIGS.1-5, an unpowered cowl with adjustable fan blades of the present disclosure comprises a cowl body1and a base2. The cowl body1comprises a top cap11, a bottom ring12, and the fan blades13closely disposed between the top cap11and the bottom ring12. The top cap11and the fan blades13are arc-shaped, so that rain is effectively prevented from being accumulated on an outer surface of the cowl body1. The base2comprises a variable-angle pipe neck21and a waterproof base22fixedly connected to the variable-angle pipe neck21. A screw3and an upper support4are disposed in the cowl body1. A lower support5is disposed in the base2. An upper end of the screw3is rotatably connected to the top cap11. A lower end of the screw3passes through a center of the upper support4. The lower end of the screw3is fixedly connected to the lower support5.

The unpowered cowl further comprises lifting mechanisms6and a pressure sensor7. The pressure sensor7is disposed on an inner wall of the top cap11. An upper end of each of the fan blades13is disposed above the top cap11and slightly exceeds an outer edge of the top cap11. A quantity of the lifting mechanisms6is corresponding to a quantity of the fan blades13. The lifting mechanisms6are annularly disposed on the top cap11. The lifting mechanisms comprise lifting plates61, electric pushing rods62, and lifting shafts63. Each of the electric pushing rods63and a corresponding one of the lifting shafts63are respectively disposed on two ends of each of the lifting plates61. The electric pushing rods62are fixed on the inner wall of the top cap11. Each of the lifting shafts63is connected to a corresponding one of the fan blades13. The electric pushing rods62and the pressure sensor7are electrically connected to a control box8. The control box8is disposed on an outer wall of the top cap11. An angle between each of the lifting shafts63and a corresponding one of the lifting plates61is 120°. At this time, an angle between each of the lifting shafts63and a vertical plane is 20°. When the lifting plates61are subjected to downward pressure, the lifting shafts62obliquely move upwards.

When in sue, the pressure sensor7detects a pressure inside the unpowered cowl and send a pressure value to the control box8. When the pressure value is greater than a predetermined value (which is determined according to various factors such as floor height), the control box8determines that an amount of cooking fumes in a common flue is large, and the control box8controls the electric pushing rods62to work. Specifically, each of the electric pushing rods62pushes a first end of each of the lifting plates61to move downwards, so that a second end of each of the lifting plates61tilts to drive each of the lifting shafts63to move upwards to lift each of the fan blades13(when a lower end of each of the fan blades13is fixed, each of the lifting shafts62obliquely moves upwards to lift an upper end of each of the fan blades13, and an end portion of the upper end of each of the fan blades13contact the top cap11, and at this time, the height of the fan blades13is improved), thereby increasing an opening degree of the fan blades13and increasing an exhaust amount of the cooking fumes from the unpowered cowl.

In the embodiment, each of the lifting plates61is in a shape of a water drop. A large end of each of the lifting plates61is connected to a corresponding one of the electric pushing rods62, and a small end of each of the lifting plates61is connected to a corresponding one of the lifting shafts63. Therefore, when the electric pushing rods62push the lifting plates61downwards, the lifting shafts63are easier to be driven to move upwards.

In the embodiment, two sides of the upper end of each of the fan blades13are connected to two adjacent fan blades13through corresponding two of the lifting shafts63. Therefore, it is ensured that an increased opening degree of each of the fan blades13is relatively uniform, so that the cooking fumes are uniformly exhausted from the unpowered cowl. Furthermore, each of the lifting shafts63is cylindrical and comprises internal threads. Each of the lifting shafts63is connected to a corresponding one of the fan blades13through a bolt.

The unpowered cowl further comprises rivets. Two sides of a lower end of each of the fan blades13are respectively connected to two adjacent fan blades13through corresponding rivets, and the rivets are fixed on the bottom ring12. Therefore, a structure of the unpowered cowl is simple, and the unpowered cowl is easy to assemble.

In the embodiment, the upper support4is fixedly connected to an inner wall of the bottom ring12through the rivets; and the lower support5is fixedly connected to an inner wall of the variable angle pipe neck21through the rivets. Therefore, the unpowered cowl is easy to assemble, and connection firmness is high.

The present disclosure further provides a waste heat recovery system for cooking fumes as shown inFIGS.6-8. The waste heat recovery system for the cooking fumes comprises the unpowered cowl mentioned above, a common flue, and thermoelectric generators9.

The unpowered cowl is disposed at the common flue. The thermoelectric generators are disposed around the unpowered cowl at intervals along a circumferential direction thereof. The thermoelectric generators9are rectangular. One end, close to the unpowered cowl, of each of the thermoelectric generators9is a hot end901. One end, away from the unpowered cowl, of each of the thermoelectric generators9is a cold end902. An output end903of each of the thermoelectric generators9is a lower portion of each of the thermoelectric generators9. The hot end of each of the thermoelectric generators9is disposed opposite to the fan blades13, and the output end903of each of the thermoelectric generators9is electrically connected to a storage battery10.

The thermoelectric generators9are configured to absorb and convert waste heat of the cooking fumes in the common flue into the electric energy, and each of the thermoelectric generators9outputs the electric energy to the storage battery10through the output end thereof. The storage battery10is configured to supply power to small devices in a building (for example, various measurement devices, control valves, control switches, sensors, etc.), thereby avoiding energy waste and avoiding use of mains supply.

In one optional embodiment, the control box8comprises a controller and a power module. The power module is electrically connected to the controller, the electric pushing rods, and the pressure sensor. The control box8is connected to the storage battery10through a conductive slip ring. Therefore, the controller, the electric pushing rods62, and the pressure sensor7are directly powered by the electric energy generated by the thermoelectric generators9(the electric energy is generated by absorbing the waste heat of the cooking fumes) without providing additional independent power sources. Therefore, an installation structure thereof is simplified, which helps to control costs.

Furthermore, an ultraviolet lamp is disposed on an inner wall of an outlet of the common flue, and the ultraviolet lamp is electrically connected to the storage battery10. The ultraviolet lamp is configured to disinfect and purify the cooking fumes in the common flue, so that exhausted cooking fumes are more environmentally friendly. After the exhausted cooking fumes not absorbed by the thermoelectric generators9are exhausted into atmosphere, environment is not polluted.

Foregoing general description of embodiments involved in the present disclosure and the description of the specific implementations thereof should not be construed as a limitation to technical solutions of the present disclosure. According to the embodiments of the present disclosure, those skilled in the art may add, reduce, or combine technical features disclosed in the general description or/and the specific implementations (including the embodiments) without violating the related components, and form other technical solutions within the protection scope of the present disclosure.