Multifunctional adjustable energy-saving exhaust fan

Abstract

The invention belongs to the technical field of energy-saving ventilation, and discloses a multifunctional adjustable energy-saving exhaust fan which comprises a shell, a driving motor and fan blades, the shell is provided with an air inlet and an air outlet which are communicated, the shell is provided with a circulation channel, the circulation channel is provided with a communication opening and an air outlet, and the air inlet is communicated with the air outlet. The communicating port and the air outlet are located in the side, where the exhaust port and the air inlet are located, of the shell respectively. According to the integrated linkage mechanism, the consistency of double-end sealing actions is ensured, the phenomenon that one end is opened, the other end is closed or partial leakage is caused by asynchronous response of independent control elements or single-side sealing failure is avoided, airflow short circuit between a main exhaust channel and a circulation channel is effectively prevented, and the service life of the main exhaust channel and the circulation channel is prolonged. The exhaust mode and the circulation mode are guaranteed to independently and efficiently operate, and the trustworthiness of equipment functions is improved.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving ventilation technology, specifically relating to a multifunctional adjustable energy-saving exhaust fan. Background Technology

[0002] Traditional exhaust fans only exhaust air in one direction, removing stale air along with the regulated indoor temperature (cooling or heating). Especially in winter and summer, untreated fresh air enters directly, significantly increasing the load on air conditioning or heating systems and causing energy waste. Therefore, single-function exhaust fans are no longer sufficient to meet the demands of modern buildings for both efficient ventilation and energy conservation. To address this challenge, intelligent ventilation devices with multiple operating modes have emerged on the market, aiming to balance air exchange and energy loss. However, the following problems exist in practical applications: First, the reliability of airflow channel switching directly affects energy efficiency. Some products use movable baffles or dampers to change the airflow path, but due to unreasonable mechanical structure design, material deformation, or long-term wear, dampers often fail to close completely, leading to leakage between different air ducts. This "cross-flow" phenomenon causes airflow to short-circuit or split when the equipment is executing specific modes (such as circulation only or exhaust only), failing to achieve the expected ventilation effect and severely reducing the effectiveness of the function and the user experience.

[0003] Secondly, the internal structure is prone to dust accumulation, impairing long-term energy efficiency. Ventilation equipment ducts, especially bypass ducts that do not participate in the main airflow or are only used in specific modes, often become open "dust collectors" when not in operation. Indoor suspended particles naturally settle and accumulate on the inner walls of these concealed ducts. Due to their compact structure and hidden location, users find it difficult to clean them effectively. Long-term dust accumulation not only breeds bacteria and mold, causing secondary pollution, but also increases air resistance, reducing the long-term operating efficiency of the equipment. This contradicts the original intention of energy-saving design. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a multifunctional adjustable energy-saving exhaust fan to solve the problems existing in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is a multifunctional adjustable energy-saving exhaust fan, characterized in that it includes a housing, a drive motor, and fan blades. The housing has an air inlet and an air outlet arranged in communication. The housing has a circulation channel with a connecting port and an air outlet, which are respectively located on the side of the exhaust port and the air inlet on the housing. The exhaust port, the connecting port, and the air outlet can be switched between open and closed. When the connecting port and the air outlet are both closed and the exhaust port is open, the circulation channel is in a closed state, and the exhaust fan performs normal exhaust operation under the action of the fan blades. When the connecting port and the air outlet are both open and the exhaust port is closed, the circulation channel is in a conductive state, and the exhaust fan performs indoor air circulation operation under the action of the fan blades. By switching the circulation channel between the closed and conductive states, the problem of dust accumulation inside the exhaust fan caused by contamination of the circulation channel when it is not in operation is avoided.

[0006] Preferably, the housing includes a fixing member and a moving member, both of which are arranged in a ring shape. The fixing member is located outside the moving member, and the moving member is slidably disposed on the fixing member. The cavity between the fixing member and the moving member is the circulation channel. By moving the position of the moving member on the fixing member, the opening or closing of the connecting port and the air outlet is synchronously controlled, thereby switching the circulation channel between a closed state and a connected state.

[0007] Furthermore, the fixing member is provided with a tail plate and a head plate at both ends of the connecting port and the air outlet, respectively; when the circulation channel is in a closed state, the moving member contacts the tail plate and the head plate, so that both the connecting port and the air outlet are in a closed state; when the circulation channel is in a conductive state, the moving member separates from the tail plate and the head plate, so that both the connecting port and the air outlet are in an open state.

[0008] Furthermore, the tail plate of the fixing member is provided with an exhaust window and a baffle. The baffle is rotatably mounted on the fixing member and is used to selectively block or connect the exhaust window, thereby switching the exhaust port between an open state and a closed state.

[0009] Furthermore, a linear moving component is provided on the fixing member. The linear moving component includes a moving motor, a lead screw, and a moving nut. One end of the lead screw is connected to the output shaft of the moving motor, and the other end of the lead screw is rotatably supported on the tail plate. The moving nut is threadedly engaged with the lead screw and serves as the moving end of the linear moving component, connecting it to the moving component. The fixing member and the moving component are slidably engaged through a guide rail structure to restrict the rotational freedom of the moving component, so that under the drive of the moving motor, the moving component achieves linear motion along the guide rail structure via the helical transmission of the lead screw and the moving nut.

[0010] Furthermore, the baffle is equipped with a control motor, which is used to control the baffle to block or open the exhaust window.

[0011] Furthermore, the tail plate has a center point, and the baffle is rotatably mounted on the tail plate about this center point as an axis of rotation; the outer periphery of the baffle is provided with teeth, which are distributed in a circular array around the center point, so that the baffle forms an external meshing cylindrical gear; a drive gear is provided at one end of the lead screw near the tail plate, and the drive gear meshes with the external meshing cylindrical gear; thus, when the moving motor drives the lead screw to rotate, it drives the moving part to move linearly, and at the same time drives the baffle to rotate around the center point via the gear transmission chain.

[0012] Furthermore, the drive motor is mounted on the tail plate, and the fan blades are mounted on the output end of the drive motor.

[0013] Furthermore, the moving end of the linear moving component and the moving part are detachably connected. When the moving part is removed, it can be cleaned and the circulation channel can be exposed, thereby facilitating cleaning and maintenance of the circulation channel.

[0014] Furthermore, the linear moving component is disposed in the circulation channel, and the linear moving component is located above the moving member.

[0015] The main technical effects of this invention are reflected in the following aspects: This invention employs a design where a ring-shaped moving component slides on a fixed component, allowing the connection port and outlet of the circulation channel to be controlled by the same moving part. When the moving component slides to the closed position, both ends simultaneously engage with the tail plate and head plate, forming a physical seal; when the moving component slides to the open position, both ends simultaneously separate, enabling the circulation channel to open. This integrated linkage mechanism ensures the consistency of the sealing action at both ends, avoiding the "one end open, one end closed" or "partial leakage" phenomena caused by asynchronous responses of independent control elements or failure of a single-sided seal. It effectively prevents airflow short-circuiting between the main exhaust channel and the circulation channel, ensuring that the exhaust mode and circulation mode operate independently and efficiently, thus improving the reliability of the equipment's functions.

[0016] In traditional equipment, bypass ducts are constantly exposed to the environment, becoming open "dust collection chambers." In contrast, this invention, during exhaust mode operation, completely seals both ends of the circulation channel with a moving component, creating a sealed environment that prevents external air and suspended particles from entering. This "open when in use, sealed when not in use" design concept cuts off the path for dust to enter non-working ducts at the source, avoiding problems such as dust accumulation, bacterial growth, or increased air resistance on the duct walls after long-term operation. It not only maintains internal cleanliness but also preserves the long-term ventilation efficiency and air quality of the equipment, truly achieving sustainable energy-saving design. Furthermore, the moving component and the moving end of the linear moving part are detachably connected using snap-fit, screw, or quick-connect structures. When cleaning is required, the moving component can be easily removed entirely. This not only facilitates surface cleaning but, more importantly, completely exposes the previously closed circulation channel cavity, allowing operators to directly visually inspect and clean the dust accumulation on the duct walls. This modular, open maintenance design significantly reduces cleaning difficulty, extends equipment lifespan, ensures long-term hygiene and energy efficiency stability, and enhances the user experience.

[0017] A drive gear is installed at the end of the lead screw, meshing with an external meshing cylindrical gear around the periphery of the baffle. When the movable motor drives the lead screw to rotate, it propels the moving part in a linear motion through the helical transmission between the lead screw and the movable nut, and simultaneously drives the baffle to rotate around the central axis through the gear pair, thereby synchronously controlling the opening and closing of the circulation channel and the opening and closing of the main exhaust port. This linkage mechanism achieves coordinated control of "one motor drive, dual function response," ensuring that the two airflow paths are always in a mutually exclusive state—that is, the circulation channel must be closed when the exhaust port is open, and the exhaust port must be closed when the circulation channel is open. This completely avoids the risk of simultaneous conduction of both channels due to control logic errors or actuator malfunctions, improving the automation level and safety reliability of the system operation. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the present invention; Figure 2 for Figure 1 Structural diagram of the inner and outer shell; Figure 3 for Figure 1 Half-section structural diagram of the inner shell; Figure 4 This is a partial rear view structural diagram of the present invention; Figure 5 for Figure 4 Structural diagram of the linear moving component; In the diagram: 1. Outer shell; 11. Fixing component; 12. Moving component; 13. Tail plate; 14. Head plate; 15. Exhaust window; 16. Baffle; 2. Drive motor; 3. Fan blade; 31. Air inlet; 32. Exhaust outlet; 33. Circulation channel; 34. Connecting port; 35. Air outlet; 4. Linear moving component; 41. Moving motor; 42. Lead screw; 43. Moving nut; 44. Drive gear. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master. In the embodiments, it should be understood that the terms "middle," "upper," "lower," "top," "right side," "left end," "above," "back," "center," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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, and therefore should not be construed as a limitation of the present invention. In addition, unless otherwise specified in this specific embodiment, the connection or fixing method between components can be achieved by bolt fixing, pin fixing, or pin connection commonly used in the prior art, etc., and therefore will not be described in detail in this embodiment.

[0020] The multifunctional adjustable energy-saving exhaust fan provided by this invention is mainly used in building ventilation systems such as residences, office buildings, hospitals, and schools where high indoor air quality and energy efficiency are required. It is especially suitable for scenarios that require flexible switching of ventilation modes under different seasons or air quality conditions. However, it is not limited to this application and can also be used in other similar or identical production processes, such as air circulation control in cleanrooms, switching between local exhaust and internal circulation in laboratories, energy-saving ventilation systems in underground parking lots, and various ventilation devices for enclosed spaces that require both air renewal and heat preservation. It has good adaptability and application prospects.

[0021] Furthermore, as is common knowledge in this industry, the basic mechanical and electrical principles mentioned above—such as the drive motor 2 rotating the fan blades 3 to generate airflow, the screw 42 and nut forming a helical transmission to achieve linear motion, the guide rail structure for guidance and limiting, gear meshing to transmit rotational power, and the motor control system for automated start / stop and mode switching—are all standard technical methods in the field of ventilation equipment. Since these are common knowledge, their principles and structures will not be elaborated upon further.

[0022] Example 1 This embodiment provides a multi-functional adjustable energy-saving exhaust fan, which aims to solve the technical problems of traditional exhaust equipment during ventilation mode switching, such as airflow crosstalk, poor sealing, and easy dust accumulation in the internal air duct.

[0023] See Figure 1 The system mainly includes a housing 1, a drive motor 2, and fan blades 3. The housing 1 has an air inlet 31 and an exhaust outlet 32 ​​connected in a continuous manner, forming a main exhaust airflow channel. The housing 1 has a circulation channel 33, which has a connecting port 34 and an air outlet 35. The connecting port 34 and the air outlet 35 are located on the sides of the housing 1 where the exhaust outlet 32 ​​and the air inlet 31 are located, respectively. The exhaust outlet 32, the connecting port 34, and the air outlet 35 can be switched between open and closed to achieve switching between different working modes: when the connecting port 34 and the air outlet 35 are both in the closed state and the exhaust outlet 32 ​​is in the open state, the circulation channel 33 is in the closed state. Under the action of the fan blades 3, the exhaust fan performs normal exhaust operations, directly expelling indoor polluted air to the outside. When the connecting port 34 and the air outlet 35 are both open, and the exhaust port 32 is closed, the circulation channel 33 is in a conductive state. Under the action of the fan blades 3, the exhaust fan achieves indoor air circulation. The airflow passes through the air inlet 31, connecting port 34, circulation channel 33, air outlet 35, and indoor space, achieving self-circulation of indoor air without external air exchange, thus retaining the regulated indoor temperature energy and achieving energy saving. By switching the circulation channel 33 between closed and conductive states, the problem of dust accumulation inside the exhaust fan due to contamination of the circulation channel 33 when not in operation is avoided. By dynamically controlling the opening and closing of the circulation channel 33, it is made to open only when needed and completely close when not in operation, fundamentally avoiding the problem of natural dust accumulation caused by long-term exposure of traditional bypass ducts. This prevents increased wind resistance, secondary pollution, and efficiency reduction caused by dust accumulation, improving the long-term operational stability and air quality assurance capabilities of the equipment.

[0024] Preferred, see Figure 2 , Figure 3The outer casing 1 includes a fixing member 11 and a moving member 12. Both the fixing member 11 and the moving member 12 are arranged in a ring shape. The fixing member 11 is located outside the moving member 12. The moving member 12 is slidably disposed on the fixing member 11. The cavity between the fixing member 11 and the moving member 12 is the circulation channel 33. By moving the moving member 12 on the fixing member 11, the opening or closing of the connecting port 34 and the air outlet 35 is controlled synchronously, thereby switching the circulation channel 33 between a closed state and a connected state. Specifically, the fixing member 11 is provided with a tail plate 13 and a head plate 14 at both ends of the connecting port 34 and the air outlet 35, respectively. When the circulation channel 33 is in a closed state, the moving member 12 is in contact with the tail plate 13 and the head plate 14, so that both the connecting port 34 and the air outlet 35 are in a closed state. When the moving member 12 slides to one end of its limit position and fits tightly with the tail plate 13 and the head plate 14, the connecting port 34 and the air outlet 35 are physically blocked, and the circulation channel 33 is completely closed. When the circulation channel 33 is in a conductive state, the moving member 12 is separated from the tail plate 13 and the head plate 14, so that both the connecting port 34 and the air outlet 35 are in an open state. When the moving member 12 slides in another direction and disengages from the two end plates, the connecting port 34 and the air outlet 35 are exposed again, and the circulation channel 33 is open. This integrated sliding seal structure enables simultaneous opening and closing at both ends, ensuring consistent sealing and eliminating the risk of unilateral leakage.

[0025] To improve sealing, sealing rings or gaskets made of elastic materials such as silicone, rubber or polyurethane can be provided on the contact surfaces of the moving part 12 with the tail plate 13 and the head plate 14. This further eliminates the "air leakage" phenomenon and can also compensate for the attenuation of sealing performance caused by mechanical wear or assembly tolerances during long-term operation, thereby improving the durability and reliability of the equipment.

[0026] Further, see Figure 3 , Figure 4 , Figure 5 To achieve independent control of the main exhaust port 32, an exhaust window 15 and a baffle 16 are provided on the tail plate 13 of the fixing member 11. The baffle 16 is rotatably mounted on the fixing member 11 and is used to selectively block or connect the exhaust window 15, thereby switching the exhaust port 32 between open and closed states. In conjunction with the aforementioned state change of the circulation channel 33, the system can reliably switch between the two modes of "pure exhaust" and "pure circulation".

[0027] Specifically, a linear moving component 4 is provided on the fixing member 11. The linear moving component 4 includes a moving motor 41, a lead screw 42, and a moving nut 43. One end of the lead screw 42 is connected to the output shaft of the moving motor 41, and the other end of the lead screw 42 is rotatably supported on the tail plate 13. The moving nut 43 is threadedly engaged with the lead screw 42, and the moving nut 43 serves as the moving end of the linear moving component 4 and is connected to the moving component 12. The fixing member 11 and the moving component 12 are slidably engaged through a guide rail structure to restrict the rotational freedom of the moving component 12. This allows the moving component 12 to move linearly along the guide rail structure under the drive of the moving motor 41 via the helical transmission of the lead screw 42 and the moving nut 43. Furthermore, the baffle 16 is equipped with a control motor, which controls the baffle 16 to either block or open the exhaust window 15, ensuring that its movement is coordinated with the movement of the moving component 12 and avoiding airflow path conflicts. Although the dual-motor control system has a clear structure, it relies on precise timing control logic to prevent the exhaust port 32 and the circulation channel 33 from opening simultaneously during the switching process, thereby maintaining the safety and effectiveness of the system operation.

[0028] In addition, the drive motor 2 is mounted on the tail plate 13, and the fan blade 3 is mounted on the output end of the drive motor 2.

[0029] Example 2 Based on Embodiment 1, this embodiment further optimizes the mechanical linkage mechanism. Specifically, the linear drive of the moving part 12 and the rotation control of the baffle 16 are mechanically linked through the same power source, eliminating the independent control motor and forming a "one-drive, two-motion" collaborative control system.

[0030] Preferred, see Figure 1 , Figure 4 , Figure 5 The tail plate 13 has a center point, and the baffle 16 is rotatably mounted on the tail plate 13 about the center point. The outer periphery of the baffle 16 is provided with teeth, which are arranged in a circular array around the center point, so that the baffle 16 forms an external meshing cylindrical gear. The end of the lead screw 42 near the tail plate 13 is provided with a drive gear 44, which meshes with the external meshing cylindrical gear. Thus, when the moving motor 41 drives the lead screw 42 to rotate, it drives the moving part 12 to move linearly and drives the baffle 16 to rotate around the center point via the gear transmission chain.

[0031] When the moving motor 41 starts and drives the lead screw 42 to rotate, it has a dual effect: on the one hand, the helical pair between the lead screw 42 and the moving nut 43 converts the rotational motion into the linear motion of the moving nut 43, thereby driving the moving part 12 to slide along the guide rail, realizing the opening and closing of the circulation channel 33; on the other hand, the rotation of the lead screw 42 itself is transmitted to the external meshing gear of the baffle 16 through the drive gear 44 at its end, thereby driving the baffle 16 to rotate around the center point, completing the opening or closing operation of the exhaust window 15. Thus, the entire mode switching process does not require an additional control motor; the translation of the moving part 12 and the rotation of the baffle 16 can be completed synchronously by a single moving motor 41, realizing the interlocking switching between the exhaust port 32 and the circulation channel 33. For example, when switching from the exhaust mode to the circulation mode, while the moving part 12 moves backward to open the circulation channel 33, the baffle 16 rotates synchronously to close the exhaust port 32, ensuring that the two airflow paths are not simultaneously connected. This mechanical linkage method not only simplifies the control system and reduces costs, but also fundamentally avoids the risk of "cross-flow" caused by asynchronous electrical control signals or actuator response delays, greatly enhancing the reliability and safety of function switching.

[0032] Further, see Figure 5 The linear moving component 4 and the moving part 12 are detachably connected (e.g., secured by clips, screws, or quick-connect interfaces). When the moving part 12 is removed, it can be cleaned, and the circulation channel 33 can be exposed, facilitating cleaning and maintenance. When cleaning or maintenance is required, the moving part 12 can be easily removed entirely. This not only facilitates cleaning the surface of the moving part 12, but more importantly, after disassembly, the inner cavity of the circulation channel 33 is fully exposed, allowing the operator to directly enter the channel to remove accumulated dust or inspect its structural condition. This design completely solves the problem of traditional closed air ducts being difficult to clean, greatly improving the maintainability and hygiene of the equipment and extending its service life.

[0033] Furthermore, the linear moving component 4 is positioned within the circulation channel 33, above the moving component 12. This effectively prevents dust particles suspended in the environment from naturally settling onto the transmission mechanism surface due to gravity when the equipment is not in operation or the circulation mode is off. If such dust accumulates in the thread groove of the lead screw 42 or the meshing part of the moving nut 43 for a long time, it can easily lead to increased transmission resistance, movement jamming, or even mechanical wear, affecting the smoothness and lifespan of mode switching. By placing it above the moving component, the risk of dust falling directly into the system is significantly reduced, improving the operational reliability and durability of the transmission system. Additionally, during cleaning and maintenance, when the moving component 12 is removed and the circulation channel 33 is fully exposed, operators may use a damp cloth or cleaning solution to wipe the inner wall of the duct to remove dust. If the linear moving component 4 is located below or close to the bottom of the duct, it is easily contaminated with water droplets or becomes damp during cleaning, potentially causing problems such as metal component corrosion, motor short circuits, or thread jamming. By placing it in a high position above the moving part 12, a physical barrier can be formed, which greatly reduces the possibility of liquid splashing or residue during cleaning, and provides good moisture-proof and waterproof protection.

[0034] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A multifunctional adjustable energy-saving exhaust fan, characterized in that, The device includes a housing, a drive motor, and fan blades. The housing has an air inlet and an air outlet that are connected in a manner. The housing also has a circulation channel with a connecting port and an air outlet. The connecting port and the air outlet are located on the same side of the housing as the air outlet and the air inlet, respectively. The exhaust port, the connecting port, and the air outlet can be switched between opening and closing; When both the connecting port and the air outlet are closed and the exhaust port is open, the circulation channel is closed, and the exhaust fan performs its normal exhaust operation under the action of the fan blades. When both the connecting port and the air outlet are open and the exhaust port is closed, the circulation channel is in a conductive state, and the indoor air circulation operation of the exhaust fan is realized under the action of the fan blades. By switching the circulation channel between a closed state and an open state, the problem of dust accumulation inside the exhaust fan caused by contamination of the circulation channel when it is not in operation is avoided.

2. The energy-saving exhaust fan as described in claim 1, characterized in that: The outer shell includes a fixing member and a moving member, both of which are arranged in a ring shape. The fixing member is located outside the moving member, and the moving member is slidably disposed on the fixing member. The cavity between the fixing member and the moving member is the circulation channel. The opening and closing of the connecting port and the air outlet are synchronously controlled by moving the movable part on the fixed part, thereby switching the circulation channel between the closed state and the open state.

3. The energy-saving exhaust fan as described in claim 2, characterized in that: The fastener is provided with a tail plate and a head plate at both ends of the connecting port and the air outlet, respectively; When the circulation channel is in a closed state, the moving part is in contact with the tail plate and the head plate, so that both the connecting port and the air outlet are in a closed state. When the circulation channel is in the conductive state, the moving part is separated from the tail plate and the head plate, so that both the connecting port and the air outlet are in the open state.

4. The energy-saving exhaust fan as described in claim 3, characterized in that: The tail plate of the fixing member is provided with an exhaust window and a baffle. The baffle is rotatably mounted on the fixing member and is used to selectively block or connect the exhaust window, so as to switch the exhaust port between an open state and a closed state.

5. The energy-saving exhaust fan as described in claim 4, characterized in that: A linear moving component is provided on the fixing component. The linear moving component includes a moving motor, a lead screw, and a moving nut. One end of the lead screw is connected to the output shaft of the moving motor, and the other end of the lead screw is rotatably supported on the tail plate. The moving nut is threadedly engaged with the lead screw and serves as the moving end of the linear moving component, connecting to the moving component. The fixed component and the moving component are slidably engaged by a guide rail structure to restrict the rotational freedom of the moving component, so that under the drive of the moving motor, the moving component can achieve linear motion along the guide rail structure via the helical transmission of the lead screw and the moving nut.

6. The energy-saving exhaust fan as described in claim 5, characterized in that: The baffle is equipped with a control motor, which is used to control the baffle to block or open the exhaust window.

7. The energy-saving exhaust fan as described in claim 5, characterized in that: The tail plate has a center point, and the baffle is rotatably mounted on the tail plate with the center point as the pivot. The outer periphery of the baffle is provided with teeth, which are arranged in a circular array with the center point as the center, so that the baffle forms an external meshing cylindrical gear. A drive gear is provided at one end of the lead screw near the tail plate, and the drive gear meshes with the external meshing cylindrical gear; thus, when the moving motor drives the lead screw to rotate, it drives the moving part to move linearly, and at the same time drives the baffle to rotate around the center point via the gear transmission chain.

8. The energy-saving exhaust fan as described in any one of claims 3 to 7, characterized in that: The drive motor is mounted on the tail plate, and the fan blades are mounted on the output end of the drive motor.

9. The energy-saving exhaust fan as described in any one of claims 5 to 7, characterized in that: The moving end of the linear moving component and the moving part are detachably connected. When the moving part is removed, it can be cleaned and the circulation channel can be exposed, which facilitates cleaning and maintenance of the circulation channel.

10. The energy-saving exhaust fan as described in claim 9, characterized in that: The linear moving component is disposed in the circulation channel and is located above the moving part.

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