Pipeline fan

Abstract

The invention discloses a pipeline fan which comprises a fan body, and the fan body is elastically installed in a pipeline through a suspension supporting frame. The fan body is elastically pressed towards the top face of the pipeline through the suspension supporting frame, and the pipeline is separated through the suspension supporting frame and the fan body. An inclined guide surface is formed at one end, positioned on the outer side of the pipeline, of the suspension support frame; when the inclined guide face of the suspension supporting frame is pressed and the gap of the stroke receding cavity is reduced, the draught fan main body can slide outwards along the inclined guide face and move to the outer side end of the pipeline, and at the moment, a driving mechanism in the draught fan main body is automatically overturned to be in an exposed state. According to the pipeline fan, through the suspension supporting frame, the pipeline fan has very good damping performance, noise transmission is reduced, the pipeline fan installed in a pipeline can be moved to the outside by means of external operation through the suspension supporting piece, the fan blades and the motor are exposed, and overhauling and maintaining are convenient.

Description

Technical Field

[0001] The invention relates to the field of fans, and in particular to a pipeline fan. Background Art

[0002] In modern buildings and industrial fields, duct fans are widely used in ventilation, air exchange and air circulation. Traditional duct fans are usually fixedly installed, that is, the fan body is directly fixed inside the duct. Although this design structure is simple, it has many defects and shortcomings in actual application, which are mainly reflected in the following aspects: First, the vibration force generated by the fan during operation will be directly transmitted to the pipeline, causing the pipeline to vibrate greatly, thereby generating obvious noise. This vibration will not only affect the stability of the fan, but may also accelerate the structural fatigue of the pipeline and affect its service life. In addition, the noise pollution caused by vibration is particularly prominent in residential areas, office environments or places with precision instruments, affecting the user experience.

[0003] Secondly, most existing duct fans use vertical air intake, that is, the external air is vertically sucked into the duct by the suction of the fan blades. However, this vertical air intake method has many disadvantages. Since the external airflow needs to overcome a large air resistance before entering the fan blades, the air intake efficiency is low, affecting the overall air volume output of the fan. At the same time, vertical air intake will cause turbulence and eddy currents in the airflow before entering the fan blades, increasing the power consumption of the fan and reducing the energy efficiency ratio. In addition, the vertical air intake method is not conducive to the stability of the airflow, making it easy to generate airflow disturbances and uneven wind pressure distribution during the operation of the fan.

[0004] In addition, after long-term use, traditional duct fans tend to accumulate a lot of dust and dirt on the fan blades, fan housing, and the inner wall of the duct. This is mainly because during the operation of the fan, dust particles suspended in the air enter the duct with the airflow and adhere to the fan blades, high-speed rotating parts, and the inner wall of the duct. If the dust is not cleaned for a long time, it will cause the following problems: Dust accumulation will clog the fan blades, affect the air output, and increase the fan load, causing its energy consumption to rise; Dust attached to the surface of fan blades can cause uneven weight of the blades, resulting in additional vibrations, which in turn increase fan noise; Accumulated dust may breed bacteria, mold and other microorganisms, pollute the air and affect environmental hygiene; Dust accumulation may cause poor heat dissipation in the fan motor, increase equipment failure rate, and even cause safety hazards.

[0005] However, as existing duct fans are usually fixed inside ducts, maintenance and cleaning are extremely difficult. Disassembly of the fan often requires disconnecting the duct or removing the fixed parts, which not only increases maintenance costs, but may also affect the normal operation of the duct system, causing a long period of downtime for maintenance. In addition, some duct fans are installed at high or deep locations, and manual maintenance operations inside the duct pose a safety hazard, further increasing the difficulty of maintenance. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a duct fan, which uses an inclined plate on a floating support frame to guide external air into the fan in an inclined manner, optimizes the air intake method, and improves the air intake efficiency. At the same time, the installation structure of the duct fan realizes convenient disassembly and maintenance. By pressing the inclined plate, the stabilizing bracket can be loosened, so that the fan body slides along the inclined plate to the outside of the duct under the action of the tilting force and gravity, and after moving to the outside, the movable top plate automatically flips, exposing the fan blades and drive motor of the fan outside the fan housing, which is convenient for users to inspect and maintain the fan.

[0007] The present invention is realized by the following technical scheme: a pipeline fan, comprising: A fan body, wherein the fan body is elastically mounted in a pipeline via a suspension support frame; After installation, a travel concession cavity is formed between the suspension support frame and the bottom surface of the pipeline, and the suspension support frame elastically presses the fan body toward the top surface of the pipeline, and the pipeline is isolated by the suspension support frame and the fan body; The suspension support frame is located at one end of the outer side of the pipeline to form an inclined guide surface, and the external airflow enters the air inlet end of the fan body through the inclined guide surface; When the inclined guide surface of the suspension support frame is pressed and the gap of the travel retreat cavity is reduced, the fan main unit can slide outward along the inclined guide surface and move to the outer end of the pipeline, and the driving mechanism in the fan main body is automatically flipped to an exposed state.

[0008] As a preferred technical solution, the fan body includes a fan housing, a movable top plate is arranged on the top of the fan housing, one end of the movable top plate is hinged to the fan housing through a first elastic damping shaft, and the other end of the movable top plate is a movable end; The driving mechanism is fixedly mounted on the lower end surface of the movable top plate and is located in the fan casing. An isolation sealing layer is respectively provided on both sides of the fan body. The isolation sealing layer is made of shock-absorbing rubber material. The gap between the two sides of the fan body and the inner wall of the pipeline is filled by the isolation sealing layer.

[0009] As a preferred technical solution, the driving mechanism includes a driving motor and airflow blades, the airflow blades are mounted on the driving motor, and the driving motor is fixedly mounted on the lower end surface of the movable top plate through a motor bracket. When the movable top plate is elastically flipped along the first elastic damping axis, the driving motor and the airflow blades are flipped outward relative to the fan casing to a naked state.

[0010] As a preferred technical solution, stabilizing brackets are further provided on both sides of the bottom surface of the fan casing, the bottom of the stabilizing bracket is hinged to the bottom surface of the fan casing, and the other end thereof forms a clamping portion which is clamped against the outer cylindrical surface of the drive motor. When the fan body is installed in the pipeline, the stabilizing bracket clamps the drive motor, and when the suspension support frame is pressed down, the clamping portion of the stabilizing bracket is released from the drive motor, and at this time the movable top plate can flip outward with the drive motor and the airflow blades.

[0011] As a preferred technical solution, a movable hinge shaft is respectively arranged on both sides of the bottom of the stable bracket, and hinge ears are arranged on the bottom surface of the fan casing on both sides of the movable hinge shaft, and a hinge groove is arranged on each of the hinge ears, and the movable hinge shaft is movably hinged in the hinge groove, and at least two rollers are arranged at the bottom of each of the stable brackets, and the rollers have roller grooves, and a positioning support is also arranged on the suspension support frame for positioning the rollers.

[0012] As a preferred technical solution, the suspension support frame includes a support main board and an elastic bracket, and the elastic bracket is elastically hinged to the support main board through a second elastic damping shaft; The elastic bracket includes an inclined plate and a fixed plate, a travel concession angle a is formed between the inclined plate and the fixed plate, the fixed plate is fixedly connected to the bottom surface of the pipeline, and the inclined plate partially extends into the pipeline; When the inclined plate is pressed, the stroke retreat angle a becomes smaller. Under the action of the second elastic damping shaft, the supporting main board switches from a state parallel to the horizontal to a state flush with the inclined plate. At this time, the fan body slides toward the outer side of the pipe along the inclined surface under the action of gravity.

[0013] As a preferred technical solution, the first elastic damping shaft and the second elastic damping shaft each include a shaft rod, a rubber damping sleeve and a torsion spring, the rubber damping sleeve is sleeved on the outside of the shaft rod, and the torsion spring is installed on the shaft rod.

[0014] As a preferred technical solution, a first guide rail is arranged on the upper end surface of the inclined plate, a second guide rail is arranged on the support main board at a position corresponding to the first guide rail, the positioning support member is arranged on the second guide rail, an arc-shaped positioning groove is arranged on the top of the positioning support member, and the positioning support member is made of elastic rubber material.

[0015] As a preferred technical solution, the movable end of the movable top plate is provided with a guide roller protruding from the top surface of the movable top plate, the guide roller is made of elastic rubber material, and the rest of the movable top plate does not contact the top surface of the pipe.

[0016] As a preferred technical solution, a fixed support plate is provided on the bottom surface of the inclined plate, one end of the fixed support plate is in contact with and supported by the lower end surface of the supporting main board, and the other end is fixedly connected to the bottom surface of the inclined plate, and a support spring is also provided at one end of the bottom of the supporting main board away from the inclined plate.

[0017] The beneficial effects of the present invention are as follows: 1. The present invention forms a travel concession cavity between the fan body and the pipeline by means of the elastic installation method of the suspension support frame, and uses the elastic characteristics of the suspension support frame to press the fan body against the top surface of the pipeline, thereby effectively reducing the vibration transmitted to the pipeline during the operation of the fan, reducing noise, and improving the stability and comfort of the fan operation; Secondly, one end of the fan body of the present invention optimizes the air intake mode by means of an inclined guide surface. Compared with the traditional vertical air intake mode, the inclined air intake can reduce the airflow resistance, allowing the airflow to enter the fan blades more smoothly, thereby improving the air intake efficiency and energy efficiency ratio of the fan, reducing turbulence and eddy current phenomena, and optimizing the aerodynamic performance of the fan; Thirdly, the duct fan of the present invention adopts a convenient disassembly and assembly structure. When the inclined guide surface is pressed, the gap of the stroke retreat cavity is reduced, and the fan body slides outward along the inclined guide surface. After moving to the outer end of the duct, the movable top plate automatically flips over, so that the drive motor and the fan blades are exposed to the outside, which greatly simplifies the inspection and maintenance process of the fan. Compared with the traditional fixed-installed duct fan, it does not require complicated disassembly and assembly operations, greatly reduces the maintenance cost and labor intensity, and improves the convenience of equipment maintenance. When maintenance is needed, you only need to press the floating support frame to release the clamping effect of the stabilizing bracket, allowing the fan body to automatically slide to the outside of the pipeline for maintenance, greatly improving the practicality and maintainability of the pipeline fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 The structure of the pipeline fan of the present invention is shown in FIG. Figure 1 ; Figure 4 The structure of the pipeline fan of the present invention is shown in FIG. Figure 2 ; Figure 5 The internal cross-section of the present invention is Shitong; Figure 6 For the present invention Figure 5 A partial enlarged view of the middle A; Figure 7 It is a structural schematic diagram of a positioning support member of the present invention; Description of reference numerals: 2. Fan casing; 14. Movable top plate; 15. First elastic damping shaft; 4. Driving motor; 3. Airflow blades; 10. Motor bracket; 6. Isolation sealing layer; 12. Stabilizing bracket; 21. Movable hinge shaft; 22. Hinge ear; 23. Hinge slide; 24. Roller; 25. Positioning support; 5. Support main board; 16. Second elastic damping shaft; 8. Inclined plate; 9. Fixed plate; 7. First guide rail; 26. Second guide rail; 251. Arc positioning groove; 13. Guide roller; 17. Fixed support plate; 11. Support spring; 1. Pipeline. DETAILED DESCRIPTION

[0020] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0021] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0022] like Figure 1 and Figure 2As shown, a pipeline 1 fan of the present invention comprises a fan body, and the fan body is elastically installed in a pipeline 1 through a suspension support frame; After installation, a travel retreat cavity is formed between the suspension support frame and the bottom surface of the pipeline 1. After squeezing the suspension end of the suspension support frame, the gap distance of the retreat cavity can be reduced. In this embodiment, the suspension support frame elastically presses the fan body toward the top surface of the pipeline 1, and the pipeline 1 is separated by the suspension support frame and the fan body. Among them, the suspension support frame is located at one end of the outer side of the pipeline 1 to form an inclined guide surface, and the external airflow enters the air inlet end of the fan body through the inclined guide surface; compared with the traditional vertical air inlet method, the inclined air inlet can reduce the airflow resistance, so that the airflow enters the fan blades more smoothly, improves the air inlet efficiency and energy efficiency ratio of the fan, reduces turbulence and eddy current phenomena, and optimizes the aerodynamic performance of the fan.

[0023] When the inclined guide surface of the suspension support frame is pressed and the gap of the travel retreat cavity is reduced, the fan main unit can slide outward along the inclined guide surface and move to the outer end of the pipeline 1. At this time, the driving mechanism in the fan main body automatically flips to an exposed state.

[0024] like Figure 3 and Figure 4 As shown, the fan body includes a fan housing 2, and a movable top plate 14 is arranged on the top of the fan housing 2. One end of the movable top plate 14 is hinged to the fan housing 2 through a first elastic damping shaft 15, and the other end of the movable top plate 14 is a movable end. Through the first elastic damping shaft 15, the movable top plate 14 can be elastically flipped upward relative to the fan housing 2, so that the driving mechanism originally located in the fan housing 2 is turned outward to the outside of the fan housing 2, and through the first elastic damping shaft 15, the vibration generated when the driving mechanism is working can be effectively absorbed, reducing the transmission to the pipeline 1 through the movable top plate 14; The driving mechanism is fixedly mounted on the lower end surface of the movable top plate 14 and is located in the fan housing 2. An isolation sealing layer 6 is provided on both sides of the fan body. The isolation sealing layer 6 is made of a shock-absorbing rubber material. The gap between the two sides of the fan body and the inner wall of the pipeline 1 is filled by the isolation sealing layer 6. Figure 1-Figure 4 As shown, the airflow is sucked into the interior of the pipeline 1 through the fan body, and the airflow enters the fan body through the inclined guide surface and is transported to the interior of the pipeline 1.

[0025] Among them, the driving mechanism includes a driving motor 4 and an airflow blade 3, the airflow blade 3 is installed on the driving motor 4, and the driving motor 4 is fixedly installed on the lower end surface of the movable top plate 14 through a motor bracket 10. When the movable top plate 14 is elastically flipped along the first elastic damping axis 15, the driving motor 4 and the airflow blade 3 are flipped outward relative to the fan casing 2 to an exposed state. When the airflow blade 3 and the driving motor 4 are exposed, they can be conveniently inspected and cleaned without the need for a complicated disassembly and assembly structure, and the operation is very convenient.

[0026] like Figure 5 As shown, stabilizing brackets 12 are further provided on both sides of the bottom surface of the fan casing 2, the bottom of the stabilizing bracket 12 is hinged to the bottom surface of the fan casing 2, and the other end thereof forms a clamping portion which is clamped with the outer cylindrical surface of the drive motor 4. When the fan body is installed in the pipeline 1, the stabilizing bracket 12 clamps the drive motor 4, and when the suspension support frame is pressed down, the clamping portion of the stabilizing bracket 12 is released from the drive motor 4. At this time, the movable top plate 14 can flip outward with the drive motor 4 and the airflow blades 3. When the normal installation is completed and in use, the drive motor 4 is clamped by the stabilizing bracket 12, so that the top and left and right sides of the drive motor 4 are fixed, thereby achieving the purpose of stabilizing the drive motor 4 and increasing the stability in use.

[0027] like Figure 6 As shown, a movable hinge shaft 21 is respectively arranged on both sides of the bottom of the stable bracket 12, and hinge ears 22 are arranged on the bottom surface of the fan casing 2 on both sides of the movable hinge shaft 21, and a hinge slot 23 is respectively arranged on the hinge ears 22, and the movable hinge shaft 21 is movably hinged in the hinge slot 23. At least two rollers 24 are arranged at the bottom of each of the stable brackets 12, and the rollers 24 have roller 24 grooves. A positioning support 25 is also arranged on the suspension support frame for positioning the rollers 24. Through the principle of leverage, when the fan body is installed in place, the rollers 24 are respectively located on the positioning support 25. Since the positioning support 25 is raised, the raised rollers 24 can use the principle of leverage to make the pressing part of the stable bracket 12 press the drive motor 4, so as to achieve the purpose of stabilizing the drive motor 4. Once the rollers 24 are separated from the positioning support 25, the supporting force disappears. At this time, the pressing part of the stable bracket 12 will not apply pressure to the drive motor 4.

[0028] In this embodiment, the suspension support frame includes a support main board 5 and an elastic bracket. The elastic bracket and the support main board 5 are elastically hinged through a second elastic damping shaft 16. When the fan body is installed on the support main board 5, the support main board 5 is elastically deformed relative to the elastic bracket, so that the support main board 5 is in a horizontal state. At this time, the top of the fan body is partially in contact with the top surface of the pipeline 1. The elastic force of the second elastic damping shaft 16 needs to be large enough to reset the support main board 5 after the fan body is installed. The elastic bracket includes an inclined plate 8 and a fixed plate 9, wherein a travel concession angle a is formed between the inclined plate 8 and the fixed plate 9, the fixed plate 9 is fixedly connected to the bottom surface of the pipe 1, and a portion of the inclined plate 8 extends into the pipe 1; When the inclined plate 8 is pressed, the stroke retreat angle a becomes smaller, and under the action of the second elastic damping shaft 16, the supporting main board 5 switches from a state parallel to the horizontal to a state flush with the inclined plate 8, and at this time, the fan body slides along the inclined surface toward the outer side surface of the pipe 1 under the action of gravity; When installing, first manually press down the elastic bracket to reduce the retreat angle a and press the support main board 5, then install the fan body, push the fan body to the position of the positioning support 25, control the movable top plate 14 to be located in the pipeline 1, and after it is installed in place, release your hands, and use the second elastic damping shaft 16 to elastically lift the support main board 5, so that the fan body contacts the top of the pipeline 1, and then fix the fixing plate 9 to complete the installation; When maintenance is needed, it is only necessary to manually press down the inclined plate 8. After pressing down, the fan body drops, and when there is enough space, the supporting main board 5 is elastically reset relative to the elastic bracket, so that the supporting main board 5 is aligned with the inclined plate 8 on the elastic bracket, and now it becomes an inclined surface. Under the action of gravity, the fan body will tilt and slide toward the pressing position, and the roller 24 will separate from the positioning support 25. At this time, the lever pressure applied to the stable bracket 12 disappears. Due to the loss of stable support on both sides of the stable bracket 12, the movable top plate 14 will elastically flip up along the position of the first elastic damping shaft 15. As the fan body continues to slide outward, the opening angle of the movable top plate 14 gradually increases. Until the fan body is displaced to the outside of the pipeline 1, the movable top plate 14 is completely flipped over and the drive motor 4 and the blades are exposed, and maintenance and cleaning can be conveniently carried out at this time.

[0029] In this embodiment, the first elastic damping shaft 15 and the second elastic damping shaft 16 each include a shaft rod, a rubber damping sleeve and a torsion spring. The rubber damping sleeve is sleeved on the outside of the shaft rod, and the torsion spring is installed on the shaft rod.

[0030] The upper end surface of the inclined plate 8 is provided with a first guide rail 7, the position of the supporting main board 5 corresponding to the first guide rail 7 is provided with a second guide rail 26, the positioning support 25 is provided on the second guide rail 26, and the top of the positioning support 25 is provided with an arc-shaped positioning groove 251, such as Figure 7 As shown, the positioning support member 25 is made of elastic rubber material. When the supporting main board 5 is in a horizontal state, the fan body is always positioned at the position of the positioning support member 25 to achieve positioning and operation.

[0031] Among them, the movable end of the movable top plate 14 is provided with a guide roller 13 protruding from the top surface of the movable top plate 14, and the guide roller 13 is made of elastic rubber material. The rest of the movable top plate 14 does not contact the top surface of the pipeline 1. When the movable top plate 14 is elastically flipped over, the outward-moving fan body causes the guide roller 13 on the movable top plate 14 to roll and contact along the inner wall of the pipeline 1, and then the movable top plate 14 gradually opens. Since the guide roller 13 contacts the pipeline 1, a very small angle is actually formed between the movable top plate 14 and the horizontal plane. In this way, the movable top plate 14 is only in contact with the guide roller 13, so that the top and bottom of the fan body can be in a suspended state, and the damping structure is used to reduce vibration during use.

[0032] Among them, a fixed support plate 17 is provided on the bottom surface of the inclined plate 8, one end of the fixed support plate 17 is in contact with and supported by the lower end surface of the supporting main board 5, and the other end is fixedly connected to the bottom surface of the inclined plate 8. A support spring 11 is also provided at one end of the bottom of the supporting main board 5 away from the inclined plate 8. The support spring 11 and the fixed support plate 17 are used to maintain the stability of the fan body during installation and use.

[0033] The beneficial effects of the present invention are as follows: 1. The present invention forms a travel concession cavity between the fan body and the pipeline 1 by means of the elastic installation method of the suspension support frame, and uses the elastic characteristics of the suspension support frame to press the fan body against the top surface of the pipeline 1, thereby effectively reducing the vibration transmitted to the pipeline 1 during the operation of the fan, reducing noise, and improving the stability and comfort of the fan operation; Secondly, one end of the fan body of the present invention optimizes the air intake mode by means of an inclined guide surface. Compared with the traditional vertical air intake mode, the inclined air intake can reduce the airflow resistance, allowing the airflow to enter the fan blades more smoothly, thereby improving the air intake efficiency and energy efficiency ratio of the fan, reducing turbulence and eddy current phenomena, and optimizing the aerodynamic performance of the fan; Thirdly, the fan in the pipeline 1 of the present invention adopts a convenient disassembly and assembly structure. When the inclined guide surface is pressed, the gap of the stroke retreat cavity is reduced, and the fan body slides outward along the inclined guide surface. After moving to the outer end of the pipeline 1, the movable top plate 14 automatically flips over, so that the drive motor 4 and the fan blades are exposed to the outside, which greatly simplifies the inspection and maintenance process of the fan. Compared with the traditional fixed installation of the fan in the pipeline 1, there is no need for complicated disassembly and assembly operations, which greatly reduces the maintenance cost and labor intensity, and improves the convenience of equipment maintenance; When maintenance is needed, it is only necessary to press the suspension support frame to release the pressing effect of the stabilizing bracket 12, so that the fan body automatically slides to the outside of the pipeline 1 for maintenance, which greatly improves the practicality and maintainability of the fan in the pipeline 1.

[0034] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A duct fan, characterized in that: include: A fan body, the fan body being elastically mounted in a pipeline (1) via a suspension support frame; After installation, a travel concession cavity is formed between the suspension support frame and the bottom surface of the pipeline (1), and the suspension support frame elastically presses the fan body toward the top surface of the pipeline (1), and the pipeline (1) is isolated by the suspension support frame and the fan body; The suspension support frame is located at one end of the outer side of the pipeline (1) to form an inclined guide surface, and the external airflow enters the air inlet end of the fan body through the inclined guide surface; When the inclined guide surface of the suspension support frame is pressed and the gap of the travel retreat cavity is reduced, the fan main unit can slide outward along the inclined guide surface and move to the outer end of the pipeline (1), and the driving mechanism in the fan main body is automatically flipped to an exposed state.

2. The duct fan according to claim 1, characterized in that: The fan body comprises a fan casing (2), a movable top plate (14) is arranged on the top of the fan casing (2), one end of the movable top plate (14) is hinged to the fan casing (2) via a first elastic damping shaft (15), and the other end of the movable top plate (14) is a movable end; The driving mechanism is fixedly mounted on the lower end surface of the movable top plate (14) and is located in the fan housing (2). An isolation sealing layer (6) is provided on both sides of the fan body, respectively. The isolation sealing layer (6) is made of a shock-absorbing rubber material. The gap between the two sides of the fan body and the inner wall of the pipeline (1) is filled by the isolation sealing layer (6).

3. The duct fan according to claim 2, characterized in that: The driving mechanism comprises a driving motor (4) and an airflow blade (3), wherein the airflow blade (3) is mounted on the driving motor (4), and the driving motor (4) is fixedly mounted on the lower end surface of the movable top plate (14) via a motor bracket (10). When the movable top plate (14) is elastically flipped along the first elastic damping axis (15), the driving motor (4) and the airflow blade (3) are flipped outward relative to the fan casing (2) to a naked state.

4. The duct fan according to claim 3, characterized in that: Stable brackets (12) are also provided on both sides of the bottom surface of the fan housing (2). The bottom of the stable bracket (12) is hinged to the bottom surface of the fan housing (2), and the other end thereof forms a clamping portion that is clamped against the outer cylindrical surface of the drive motor (4). When the fan body is installed in the pipe (1), the stable bracket (12) clamps the drive motor (4). When the suspension support frame is pressed down, the clamping portion of the stable bracket (12) and the drive motor (4) are released. At this time, the movable top plate (14) can flip outward with the drive motor (4) and the airflow blades (3).

5. The duct fan according to claim 4, characterized in that: A movable hinge shaft (21) is respectively arranged on both sides of the bottom of the stabilizing bracket (12); hinge ears (22) are arranged on the bottom surface of the fan casing (2) on both sides of the movable hinge shaft (21); each hinge ear (22) is provided with a hinge slot (23); the movable hinge shaft (21) is movably hinged in the hinge slot (23); at least two rollers (24) are arranged at the bottom of each stabilizing bracket (12); the rollers (24) have roller (24) slots; and a positioning support (25) is also arranged on the suspension support frame for positioning the rollers (24).

6. The duct fan according to claim 5, characterized in that: The suspension support frame comprises a support main board (5) and an elastic bracket, wherein the elastic bracket and the support main board (5) are elastically hinged via a second elastic damping shaft (16); The elastic bracket comprises an inclined plate (8) and a fixed plate (9), a travel concession angle a is formed between the inclined plate (8) and the fixed plate (9), the fixed plate (9) is fixedly connected to the bottom surface of the pipeline (1), and the inclined plate (8) partially extends into the pipeline (1); When the inclined plate (8) is pressed, the stroke retreat angle a becomes smaller, and under the action of the second elastic damping shaft (16), the supporting main board (5) switches from a state parallel to the horizontal to a state flush with the inclined plate (8), and at this time, the fan body slides along the inclined surface toward the outer side surface of the pipe (1) under the action of gravity.

7. The duct fan according to claim 6, characterized in that: The first elastic damping shaft (15) and the second elastic damping shaft (16) both comprise a shaft rod, a rubber damping sleeve and a torsion spring, wherein the rubber damping sleeve is sleeved on the outside of the shaft rod, and the torsion spring is mounted on the shaft rod.

8. The duct fan according to claim 5, characterized in that: The upper end surface of the inclined plate (8) is provided with a first guide rail (7), the position of the supporting main plate (5) corresponding to the first guide rail (7) is provided with a second guide rail (26), the positioning support member (25) is provided on the second guide rail (26), the top of the positioning support member (25) is provided with an arc-shaped positioning groove (251), and the positioning support member (25) is made of elastic rubber material.

9. The duct fan according to claim 2, characterized in that: The movable end of the movable top plate (14) is provided with a guide roller (13) protruding from the top surface of the movable top plate (14); the guide roller (13) is made of elastic rubber material; the rest of the movable top plate (14) does not contact the top surface of the pipe (1).

10. The duct fan according to claim 6, characterized in that: A fixed support plate (17) is provided on the bottom surface of the inclined plate (8); one end of the fixed support plate (17) is in contact with and supported by the lower end surface of the supporting main plate (5), and the other end is fixedly connected to the bottom surface of the inclined plate (8); a support spring (11) is also provided at one end of the bottom of the supporting main plate (5) away from the inclined plate (8).

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