Exhaust fan with pressure recovery device

Abstract

The invention relates to an exhaust fan with a pressure recovery device, which comprises an original fan, a booster fan, a gearbox, a connecting shaft, an exhaust duct and a kinetic energy recovery fan, and the booster fan and the kinetic energy recovery fan are coaxially connected with the gearbox through the connecting shaft. Compared with the prior art, the coaxial integrated design is adopted, the overall structure is simple, the device can be used after being installed, and installation and maintenance are convenient. Compared with a traditional device for generating electricity through exhaust kinetic energy, the exhaust kinetic energy is converted into mechanical energy through the kinetic energy recovery fan, then the booster fan is driven to rotate, dynamic pressure is converted into static pressure, energy consumption of an original fan is reduced, one step of energy conversion is omitted in the energy conversion process, and the overall energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust fans, and in particular to an exhaust fan with a drive pressure recovery device. Background Art

[0002] An exhaust fan is a device used to exhaust indoor air and improve air circulation. Through the rotation of blades, it discharges indoor heat, moisture, odors and pollutants to the outside or another area. It is widely used in home, commercial and industrial environments to improve air quality and comfort.

[0003] The exhaust air usually has a faster speed, especially in the scenario where the exhaust air volume is large but the exhaust duct diameter is relatively small. In this case, the high exhaust air speed means that a lot of dynamic pressure is wasted, which means that the exhaust air energy consumption of the overall system is high.

[0004] Generally, it is not common to recover the dynamic pressure of exhaust air for ordinary buildings or small facilities due to the additional economic cost, technical complexity, limited energy efficiency improvement or other design-focused limitations. However, in large industrial facilities, high-efficiency buildings or professional applications that require high energy conservation, dynamic pressure recovery of exhaust air may be more common and beneficial. These systems can significantly reduce energy consumption, improve system efficiency, and reduce negative impacts on the environment.

[0005] This is because the basic principle of most devices that recover the dynamic pressure of exhaust air is to first arrange a turbine wind turbine at the exhaust outlet so that the exhaust air drives the turbine blades to rotate, thereby converting the kinetic energy of the exhaust air into mechanical energy; then, this part of the mechanical energy is converted into electrical energy through the transmission structure and generator, that is, the dynamic pressure of the exhaust air is finally converted into electrical energy for utilization.

[0006] Chinese patent CN218209930U proposes a positive pressure building exhaust energy recovery device, including an exhaust duct, a kinetic energy utilization component, an air inlet duct, etc. The utility model drives the power generation blades of the kinetic energy utilization component to rotate through exhaust air, and can use the power of exhaust air to generate electricity, so as to achieve the purpose of effectively utilizing the kinetic energy of exhaust air.

[0007] Chinese patent CN118211306A proposes an integrated wind energy comprehensive utilization energy-saving device and a blade main parameter optimization design method. The device includes a center rod, blades arranged around the center rod, a rotating shaft disk and a mode switching mechanism. The invention adjusts the blade structure to achieve a higher wind energy utilization efficiency.

[0008] Chinese patent CN219910893U discloses an industrial exhaust power recovery device, including a power generation pipeline, a mounting ring is fixedly installed in the power generation pipeline, and a blade assembly with adjustable axial position is arranged on one side of the mounting ring. By setting the blade assembly that can slide axially, the distance between the blade and the upper air outlet can be adjusted, so that the blade position can be adjusted according to the different kinetic energy of the airflow at the exhaust outlet, and the best position can be found to maximize the power generation efficiency, ensuring efficient power generation and the stability of power generation.

[0009] Chinese patent CN117927413A proposes a wind energy utilization device, including a base, a vertical support shaft is rotatably installed on the top surface of the base, a rotating drum is mounted on the outer side of the support shaft, the rotating drum is rotatably connected to the support shaft, a plurality of large blades are evenly distributed circumferentially on the outer side of the rotating drum, each large blade includes a plurality of small blades, and a magnetic attraction component is provided inside the rotating drum, the magnetic attraction component is used to increase the gap between the small blades, so that the gap between the small blades away from the vertical direction of the wind direction is increased, thereby reducing the air resistance when the large blades rotate, which can reduce the consumption of wind energy, thereby improving the utilization rate of wind by the device.

[0010] Although the above patents have improved the blade structure and overall device to improve the utilization rate of exhaust kinetic energy, the basic principle is still to use exhaust kinetic energy to generate electricity and then use the electricity for other purposes. This leads to the problem of efficiency, that is, the efficiency of converting exhaust kinetic energy into turbine blade mechanical energy and the efficiency of power generation are multiplied, making the overall recovery efficiency of exhaust kinetic energy low. Summary of the invention

[0011] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an exhaust fan with a drive pressure recovery device, which converts the exhaust kinetic energy into mechanical energy through the kinetic energy recovery fan, thereby driving the boost fan to rotate, converting the dynamic pressure into static pressure, reducing the original fan power consumption, improving energy utilization, and improving overall efficiency.

[0012] The purpose of the present invention can be achieved by the following technical solutions:

[0013] An exhaust fan with a kinetic energy recovery device, comprising an original fan, a boost fan, a connecting shaft, a gear box, an exhaust air duct, and a kinetic energy recovery fan;

[0014] One end of the exhaust air duct is an air inlet, and the other end is an air outlet. The original fan is arranged on the air inlet side of the exhaust air duct, and the boost fan and kinetic energy recovery fan are arranged on the air outlet side.

[0015] The boost fan is arranged in the exhaust air duct, and the kinetic energy recovery fan is arranged outside the exhaust air duct. The boost fan and the kinetic energy recovery fan are coaxially connected through a connecting shaft and a gear box.

[0016] Furthermore, the boost fan and the kinetic energy recovery fan both include blades and a hub.

[0017] Furthermore, a plurality of blades are arranged on the outer periphery of the hub.

[0018] Furthermore, the hub of the boost fan and the hub of the kinetic energy recovery fan are respectively connected to the two ends of the connecting shaft. When the kinetic energy recovery fan rotates, the boost fan is driven by the connecting shaft to rotate synchronously.

[0019] Further preferably, the blades of the boost fan and the kinetic energy recovery fan are both plate-like components surrounded by an inwardly concave arc edge close to the hub, an outwardly convex arc edge away from the hub, and curved edges on both sides.

[0020] Further preferably, the boost fan and the kinetic energy recovery fan each include 6-12 blades.

[0021] Furthermore, the material of the blades of the boost fan and the kinetic energy recovery fan is any one of aluminum alloy, steel, glass fiber composite plastic, and carbon fiber composite plastic.

[0022] Preferably, the blades are made of carbon fiber composite plastic to reduce weight and improve durability.

[0023] Furthermore, a plurality of original fans are arranged on one side of the air inlet of the exhaust air duct.

[0024] Furthermore, the gear box is located at the center of the connecting shaft, and the gear box is used to transmit the power generated by the kinetic energy recovery fan under the action of wind to the boost fan, so as to maintain different rotation speeds of the kinetic energy recovery fan and the boost fan.

[0025] The air treatment process of the exhaust fan is as follows: when the exhaust air passes through the kinetic energy recovery fan arranged outside the exhaust air duct, the generated kinetic energy is recovered and converted into mechanical energy. The boost fan is coaxially connected to the kinetic energy recovery fan and is driven to rotate, which plays a role of boosting, thereby reducing the energy consumption of the original fan.

[0026] It should be noted that the exhaust fan of the drive pressure recovery device provided by the present invention is a purely mechanical structure.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) In terms of exhaust kinetic energy recovery, the present invention recovers the exhaust kinetic energy through a kinetic energy recovery fan and converts it into mechanical energy for direct use; in terms of static pressure improvement, the boost fan is coaxially connected to the kinetic energy recovery fan and is driven to rotate to increase the pressure, thereby increasing the static pressure at the exhaust point of the original fan and reducing the energy consumption of the original fan.

[0029] (2) In terms of principle, the present invention converts kinetic energy into mechanical energy and uses it directly. Compared with other devices that convert dynamic pressure into electrical energy, the energy conversion process of the present invention has one less energy conversion step, thereby improving the overall energy utilization rate.

[0030] (3) The present invention adopts a coaxial integrated structure, and its overall device is simple, highly universal, and can be installed and used immediately. It can be conveniently used in large and small facilities, has low cost, and is more convenient in terms of movement, organization, and maintenance. It will not affect the operation of other parts of the exhaust device, thus ensuring a good prospect and being easier to commercialize. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the coaxial connection between the kinetic energy recovery fan and the boost fan of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the exhaust fan of the drive pressure recovery device in Example 1 of the present invention.

[0033] The names corresponding to the figure marks in the accompanying drawings are: 1-original fan; 2-boost fan; 3-connecting shaft; 4-gear box; 5-exhaust duct; 6-kinetic energy recovery fan. DETAILED DESCRIPTION

[0034] The utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0038] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent: in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0040] Example 1

[0041] See also Figure 1 and Figure 2 , this embodiment provides an exhaust fan with a kinetic energy recovery device, including an original fan 1, a boost fan 2, a connecting shaft 3, a gear box 4, an exhaust duct 5, and a kinetic energy recovery fan 6;

[0042] One end of the exhaust duct 5 is an air inlet, and the other end is an air outlet. The original fan 1 is arranged on the air inlet side of the exhaust duct 5, and the boost fan 2 and the kinetic energy recovery fan 6 are arranged on the air outlet side.

[0043] The boost fan 2 is arranged in the exhaust air duct 5, and the kinetic energy recovery fan 6 is arranged outside the exhaust air duct 5. The boost fan 2 and the kinetic energy recovery fan 6 are coaxially connected through the connecting shaft 3 and the gear box 4.

[0044] See also Figure 1 The boost fan 2 and the kinetic energy recovery fan 6 both include blades and hubs. The hubs of the boost fan 2 and the kinetic energy recovery fan 6 are respectively connected to the two ends of the connecting shaft 3. When the kinetic energy recovery fan 6 rotates, the boost fan 2 is driven by the connecting shaft 3 to rotate synchronously.

[0045] In this embodiment, the blades of the boost fan 2 and the kinetic energy recovery fan 6 are both plate-like components surrounded by an inwardly concave arc edge close to the hub, an outwardly convex arc edge away from the hub, and curved edges on both sides.

[0046] In this embodiment, the materials of the blades of the boost fan 2 and the kinetic energy recovery fan 6 are both carbon fiber composite materials, and the boost fan 2 and the kinetic energy recovery fan 6 each include 8 blades.

[0047] In this embodiment, four existing fans 1 are arranged on one side of the air inlet of the exhaust air duct.

[0048] The gear box 4 is located at the center of the connecting shaft 3 , and is used to transmit the power generated by the kinetic energy recovery fan 6 under the action of wind to the boost fan 2 , so as to maintain different rotation speeds of the kinetic energy recovery fan 6 and the boost fan 2 .

[0049] The air treatment process of the exhaust fan is as follows: when the exhaust air passes through the kinetic energy recovery fan 6 arranged outside the exhaust duct 5, the generated kinetic energy is recovered and converted into mechanical energy. The boost fan 2 is coaxially connected to the kinetic energy recovery fan 6 and is driven to rotate, thereby playing a role of boosting, thereby reducing the energy consumption of the original fan 1.

[0050] When in use, the staff arranges the coaxially connected boost fan 2 and kinetic energy recovery fan 6 in the exhaust duct 5 and the exhaust port as a whole. The boost fan 2 is arranged in the exhaust duct 5, and the kinetic energy recovery fan 6 is arranged at the exhaust port. After installation, it can be used. When the exhaust air passes through the kinetic energy recovery fan 6, it drives the blades to rotate, and the kinetic energy is converted into mechanical energy. The boost fan 2 rotates coaxially with the kinetic energy recovery fan 6. At this time, the static pressure in the exhaust duct 5 increases. The original fan 1 works to exhaust the indoor air. At this time, due to the increase in static pressure, the power consumption of the original fan 1 is reduced. When the exhaust fan needs to be repaired, the device is normally removed for problem diagnosis, and repair or replacement is selected.

[0051] It should be noted that the exhaust fan of the drive pressure recovery device provided by the present invention is a purely mechanical structure. The exhaust fan of the present invention is generally used in various occasions where it is necessary to recover the kinetic energy of the exhaust air and reduce the power consumption of the original fan, especially in occasions where the exhaust volume is large but the exhaust duct diameter is small, such as the exhaust of large factories and shipyards.

[0052] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An exhaust fan with a drive pressure recovery device, characterized in that: It comprises an original fan (1), a boost fan (2), a connecting shaft (3), a gear box (4), an exhaust duct (5), and a kinetic energy recovery fan (6); One end of the exhaust air duct (5) is an air inlet, and the other end is an air outlet. The original fan (1) is arranged on the air inlet side of the exhaust air duct (5), and the boost fan (2) and the kinetic energy recovery fan (6) are arranged on the air outlet side. The boost fan (2) is arranged in the exhaust air duct (5), and the kinetic energy recovery fan (6) is arranged outside the exhaust air duct (5). The boost fan (2) and the kinetic energy recovery fan (6) are coaxially connected via a connecting shaft (3) and a gear box (4).

2. The exhaust fan with a drive pressure recovery device according to claim 1, characterized in that: The boost fan (2) and the kinetic energy recovery fan (6) both comprise blades and a hub.

3. The exhaust fan with a drive pressure recovery device according to claim 2, characterized in that: A plurality of blades are arranged on the outer periphery of the hub.

4. The exhaust fan with a drive pressure recovery device according to claim 2, characterized in that: The hub of the boost fan (2) and the hub of the kinetic energy recovery fan (6) are respectively connected to the two ends of the connecting shaft (3); when the kinetic energy recovery fan (6) rotates, the boost fan (2) is driven by the connecting shaft (3) to rotate synchronously.

5. The exhaust fan with a drive pressure recovery device according to claim 2, characterized in that: The blades of the boost fan (2) and the kinetic energy recovery fan (6) are both plate-shaped components surrounded by an inwardly concave arc edge close to the hub, an outwardly convex arc edge away from the hub, and curved edges on both sides.

6. The exhaust fan with a drive pressure recovery device according to claim 2, characterized in that: The material of the blades of the boost fan (2) and the kinetic energy recovery fan (6) is any one of aluminum alloy, steel, glass fiber composite plastic, and carbon fiber composite plastic.

7. The exhaust fan with a drive pressure recovery device according to claim 2, characterized in that: The boost fan (2) and the kinetic energy recovery fan (6) both include 6 to 12 blades.

8. The exhaust fan with a drive pressure recovery device according to claim 1, characterized in that: A plurality of existing fans (1) are arranged on one side of the air inlet of the exhaust air duct (5).

9. The exhaust fan with a drive pressure recovery device according to claim 1, characterized in that: The gear box (4) is located at the center of the connecting shaft (3), and is used to transmit the power generated by the kinetic energy recovery fan (6) under the action of wind to the boost fan (2), so as to maintain different rotation speeds of the kinetic energy recovery fan (6) and the boost fan (2).

10. The exhaust fan with a drive pressure recovery device according to claim 1, characterized in that: The air treatment process of the exhaust fan is as follows: when the exhaust air passes through the kinetic energy recovery fan (6) arranged outside the exhaust air duct (5), the generated kinetic energy is recovered and converted into mechanical energy. The boost fan (2) is coaxially connected to the kinetic energy recovery fan (6) and is driven to rotate, thereby playing a role of boosting the pressure, thereby reducing the energy consumption of the original fan (1).

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