Exhaust fan

Abstract

The utility model discloses an exhaust fan which comprises a rectangular mounting frame, a fence net plate, a mounting part, a first rotating shaft, a motor, a belt transmission pair, a second rotating shaft, an impeller and a driving part. In the first state, the motor can drive the impeller to rotate, and the exhaust fan works normally. In the second state, the fence net plate is far away from the rectangular mounting frame to the outer side, so that a proper distance is formed between the fence net plate and the rectangular mounting frame, and the belt transmission pair can be conveniently replaced and maintained; the mounting part, the second rotating shaft and the impeller are also far away from the rectangular mounting frame to the outer side, the second rotating shaft is separated from the first rotating shaft, the impeller cannot be driven by the motor to rotate, and the impeller can be replaced and maintained conveniently and safely.

Description

Technical Field

[0001] This utility model relates to ventilation equipment, and more particularly to an exhaust fan. Background Technology

[0002] An exhaust fan typically includes a rectangular mounting frame, a rotating shaft rotatably connected to the rectangular mounting frame, an impeller mounted on the rotating shaft, a motor fixedly connected to the rectangular mounting frame, a belt drive connecting the motor output shaft and the rotating shaft, and a mesh panel enclosing the rectangular mounting frame. To improve the impeller's efficiency, the rectangular mounting frame usually also has a cylindrical enclosure surrounding the impeller and guiding airflow. Consequently, due to the space limitations imposed by the mesh panel and enclosure, manual inspection and maintenance of the belt drive and impeller are relatively inconvenient. Utility Model Content

[0003] This application provides an exhaust fan that can solve the problems mentioned in the background art.

[0004] This application provides an exhaust fan, comprising:

[0005] A rectangular mounting frame, with a section of square tube fixed between two opposite inner walls of the frame;

[0006] The wire mesh panel is movably connected to the first side of the square tube;

[0007] The mounting section is movably connected to the second side of the square tube;

[0008] The first rotating shaft is rotatably connected to the middle position of the square tube, with its two ends facing the fence panel and the mounting part, respectively;

[0009] The motor is fixedly connected to the rectangular mounting frame;

[0010] A belt drive pair connects the motor output shaft and the first rotating shaft; it is located between the fence panel and the square tube.

[0011] The second rotating shaft is rotatably connected to the mounting part;

[0012] The impeller is mounted on the second shaft;

[0013] The drive unit is used to move the fence panel and the mounting unit, and switches between the following two states: a first state in which the fence panel is attached to the rectangular mounting frame and the second rotating shaft is inserted into the first rotating shaft; and a second state in which the fence panel is separated from the rectangular mounting frame and the second rotating shaft is separated from the first rotating shaft.

[0014] In some embodiments, the driving unit includes:

[0015] Two sets of lead screw modules are installed at both ends inside the square tube;

[0016] A bevel gear transmission pair connects two sets of lead screw modules, which is used to make the mounting sliders of the two sets of lead screw modules move in opposite directions.

[0017] Two first connecting strips, one end of which is hinged to the mounting slider of the two sets of screw modules, and the other end of which is hinged to the fence plate;

[0018] Two second connecting strips, one end of which is hinged to the mounting slider of the two sets of lead screw modules, and the other end of which is hinged to the mounting part.

[0019] In some embodiments, the rectangular mounting frame has a groove; in the first state, the edge of the fence panel is within the groove; the rectangular mounting frame is also provided with multiple sets of telescopic stops that can restrict the fence panel to the first state.

[0020] In some embodiments, the impeller includes: a mounting block for mounting on a second shaft, and a plurality of blades detachably connected to the mounting block.

[0021] In some embodiments, the square tube is oriented vertically.

[0022] In summary, this application discloses an exhaust fan comprising a rectangular mounting frame, a mesh panel, a mounting portion, a first rotating shaft, a motor, a belt drive pair, a second rotating shaft, an impeller, and a drive unit. In a first state, the motor drives the impeller to rotate, and the exhaust fan operates normally. In a second state, the mesh panel is moved away from the rectangular mounting frame to the outside, creating a suitable gap between the mesh panel and the rectangular mounting frame, facilitating convenient replacement and maintenance of the belt drive pair; the mounting portion, the second rotating shaft, and the impeller are also moved away from the rectangular mounting frame to the outside, and the second rotating shaft is separated from the first rotating shaft, preventing the impeller from being driven to rotate by the motor, allowing for convenient and safe replacement and maintenance of the impeller. Attached Figure Description

[0023] To better illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0024] Figure 1 This is a front view of this application;

[0025] Figure 2 for Figure 1 A sectional view along the middle AA;

[0026] Figure 3 The schematic diagram of this application is provided after omitting the wire mesh panel;

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0028] Figure 5 This is a schematic diagram of the installation inside the square tube;

[0029] Figure 6 for Figure 5 Enlarged schematic diagram of part B in the middle;

[0030] Figure 7 This is a sectional view of a square tube;

[0031] Figure 8 for Figure 7 An enlarged schematic diagram of section C.

[0032] In the picture,

[0033] 1. Rectangular mounting frame; 1a. Square tube; 1b. Groove; 1c. Telescopic stop bar;

[0034] 2. Fence panel; 2a. First connecting block;

[0035] 3. Installation part; 3a. Second connecting block;

[0036] 4. First rotating shaft;

[0037] 5. Electric motor;

[0038] 6. Belt drive pair;

[0039] 7. Second rotating shaft;

[0040] 8. Impeller; 8-1. Mounting block; 8-2. Blades;

[0041] 9. Drive unit; 9-1. Lead screw module; 9-1a. Mounting bracket; 9-1b. Lead screw; 9-1c. Mounting slider; 9-2. Bevel gear transmission pair; 9-3. First connecting bar; 9-4. Second connecting bar. Specific Implementation

[0042] The following description is provided in conjunction with the accompanying drawings, which are for illustrative purposes only and not strictly to scale. Unless otherwise defined, the technical or scientific terms used in this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. Unless otherwise specified, the embodiments in this application can be combined with each other.

[0043] Please see Figure 1 , Figure 2 and Figure 3 An exhaust fan includes a rectangular mounting frame 1, a mesh panel 2, a mounting part 3, a first rotating shaft 4, a motor 5, a belt drive pair 6, a second rotating shaft 7, an impeller 8, and a drive part 9.

[0044] In the rectangular mounting frame 1, a square tube 1a is fixed between two opposite inner walls of the frame. More specifically, the square tube 1a and the rectangular mounting frame 1 can be fixed by welding or by fasteners.

[0045] The square tube 1a can be oriented horizontally or vertically.

[0046] In some embodiments, the square tube 1a is oriented vertically. Compared to horizontal orientation, vertical orientation is more convenient for subsequent installation on the square tube 1a.

[0047] The fence panel 2 is movably connected to the first side of the square tube 1a. More specifically, the effect of the movable connection is that the fence panel 2 can move closer to or further away from the square tube 1a.

[0048] Mounting part 3 is movably connected to the second side of square tube 1a. More specifically, the effect of the movable connection is that mounting part 3 can move closer to or further away from square tube 1a.

[0049] Please see Figure 3 and Figure 5 The first rotating shaft 4 is rotatably connected to the middle position of the square tube 1a, with its two ends facing the fence panel 2 and the mounting part 3, respectively. More specifically, bearing seats are installed on the first and second sides of the square tube 1a, and the first rotating shaft 4 is connected to these two bearing seats.

[0050] Please see Figure 1 and Figure 2 Motor 5 is fixedly connected to rectangular mounting frame 1.

[0051] A belt drive pair 6 connects the output shaft of the motor 5 and the first rotating shaft 4, and the belt drive pair 6 is located between the fence panel 2 and the square tube 1a. More specifically, pulleys are fixedly connected to the output shaft of the motor 5 and the end of the first rotating shaft 4 facing the fence panel 2, and the belt is tensioned between these two pulleys.

[0052] Please see Figure 5 The second rotating shaft 7 is rotatably connected to the mounting part 3, and the impeller 8 is mounted on the second rotating shaft 7.

[0053] Please see Figure 3In some embodiments, the impeller 8 includes a mounting block 8-1 for mounting the second shaft 7 and a plurality of blades 8-2 detachably connected to the mounting block 8-1. Each blade 8-2 can be replaced individually, making replacement and maintenance of the impeller 8 more convenient.

[0054] Please see Figure 2 and Figure 8 The drive unit 9 is used to move the fence panel 2 and the mounting unit 3, switching between two states: a first state where the fence panel 2 is attached to the rectangular mounting frame 1 and the second rotating shaft 7 is inserted into the first rotating shaft 4; and a second state where the fence panel 2 is separated from the rectangular mounting frame 1 and the second rotating shaft 7 is separated from the first rotating shaft 4. More specifically, one of the first rotating shaft 4 or the second rotating shaft 7 can be fixedly connected to a sleeve-type coupling, and the other shaft can be connected / disconnected from the coupling by movement; the first rotating shaft 4 and the second rotating shaft 7 can also both be fixedly connected to friction discs, and transmission is achieved through friction.

[0055] In the first state, motor 5 drives impeller 8 to rotate, and the exhaust fan operates normally. In the second state, the mesh panel 2 is moved away from the rectangular mounting frame 1 to the outside, creating a suitable gap between the mesh panel 2 and the rectangular mounting frame 1, making it easier to replace and maintain the belt drive pair 6; the mounting part 3, the second rotating shaft 7, and the impeller 8 are also moved away from the rectangular mounting frame 1 to the outside, the second rotating shaft 7 is separated from the first rotating shaft 4, and the impeller 8 is not driven to rotate by motor 5, making it easier and safer to replace and maintain the impeller 8.

[0056] Please see Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the drive unit 9 includes two sets of lead screw modules 9-1, a bevel gear transmission pair 9-2, two first connecting bars 9-3, and two second connecting bars 9-4.

[0057] Two sets of lead screw modules 9-1 are respectively installed at both ends inside the square tube 1a. More specifically, the lead screw module 9-1 includes a mounting bracket 9-1a, a lead screw 9-1b, and a mounting slider 9-1c. The mounting bracket 9-1a includes mounting plates and two guide strips connecting the two mounting plates. The lead screw 9-1b is rotatably connected to the two mounting plates. The mounting slider 9-1c is slidably connected to the two guide strips and is fixedly connected with a lead screw 9-1b nut. The entire lead screw module 9-1 is inserted into the appropriate position from the end of the square tube 1a, and then the mounting bracket 9-1a and the square tube 1a are fixedly connected from the outside of the square tube 1a using screws.

[0058] The bevel gear transmission pair 9-2 connects the lead screws 9-1b of the two sets of lead screw modules 9-1, and is used to cause the mounting sliders 9-1c of the two sets of lead screw modules 9-1 to move in opposite directions. More specifically, the bevel gear transmission pair 9-2 includes two first bevel gears and a second bevel gear. The two first bevel gears are respectively fixedly connected to the lead screws 9-1b of the two sets of lead screw modules 9-1. The second bevel gear is rotatably connected to the square tube 1a and meshes with the two first bevel gears. Correspondingly, the two lead screws 9-1b rotate in opposite directions but at the same speed; therefore, the threads of the two lead screws 9-1b can have opposite directions of rotation but the same pitch.

[0059] One end of each of the two first connecting strips 9-3 is hinged to the mounting sliders 9-1c of the two sets of lead screw modules 9-1, meaning that the first side of the square tube 1a has a through groove for the first connecting strips 9-3 to pass through. The other ends of both first connecting strips 9-3 are hinged to the fence plate 2. More specifically, two first connecting blocks 2a are fixedly connected to the fence plate 2, and the first connecting blocks 2a are used to hinge with the first connecting strips 9-3. That is to say, the fence plate 2 is movably connected to the first side of the square tube 1a, but the two are not directly connected, but indirectly connected through the first connecting strips 9-3 and the mounting sliders 9-1c of the two sets of lead screw modules 9-1.

[0060] One end of each of the two second connecting strips 9-4 is hinged to the mounting slider 9-1c of the two sets of lead screw modules 9-1, meaning that the second side of the square tube 1a has a through groove for the first connecting strip 9-3 to pass through. The other ends of both second connecting strips 9-4 are hinged to the mounting part 3. More specifically, two second connecting blocks 3a are fixedly connected to the mounting part 3, and the first connecting block 2a is used to hinge with the first connecting strip 9-3. That is to say, the mounting part 3 is movably connected to the second side of the square tube 1a, but the two are not directly connected; rather, they are indirectly connected through the second connecting strips 9-4 and the mounting sliders 9-1c of the two sets of lead screw modules 9-1.

[0061] An additional motor can be connected to drive the lead screws 9-1b of the two sets of lead screw modules 9-1 to rotate, or the lead screws 9-1b of the two sets of lead screw modules 9-1 can be driven to rotate manually, so that the fence panel 2 and the mounting part 3 can move closer to / away from the square tube 1a, switching between the first state and the second state mentioned above.

[0062] Please see Figure 1 and Figure 2 In some embodiments, the rectangular mounting frame 1 has a groove 1b. In the first state, the edge of the fence panel 2 is within the groove 1b. The rectangular mounting frame 1 is also provided with multiple sets of telescopic stops 1c, which can restrict the fence panel 2 to the first state. That is, when the telescopic stops 1c extend, they block the fence panel 2 and restrict it to the first state; when the telescopic stops 1c retract, it does not affect the switching of the fence panel 2 between the first state and the second state.

[0063] Please see Figure 4 The retractable stop bar may include a nut and a wing bolt. The nut is welded and fixed to the rectangular mounting frame 1, and the wing bolt is threaded to the nut.

Claims

1. An exhaust fan, characterized in that, include: A rectangular mounting frame (1) has a square tube (1a) fixed between two opposite inner walls inside the frame; The wire mesh panel (2) is movably connected to the first side of the square tube (1a); The mounting part (3) is movably connected to the second side of the square tube (1a); The first rotating shaft (4) is rotatably connected to the middle position of the square tube (1a), with its two ends facing the fence panel (2) and the mounting part (3) respectively; The motor (5) is fixedly connected to the rectangular mounting frame (1); A belt drive pair (6) connects the output shaft of the motor (5) and the first rotating shaft (4); it is located between the fence plate (2) and the square tube (1a); The second rotating shaft (7) is rotatably connected to the mounting part (3); Impeller (8), mounted on the second rotating shaft (7); The drive unit (9) is used to drive the fence panel (2) and the mounting unit (3) to move, and switches between the following two states: the first state in which the fence panel (2) is attached to the rectangular mounting frame (1) and the second rotating shaft (7) is inserted into the first rotating shaft (4); and the second state in which the fence panel (2) is separated from the rectangular mounting frame (1) and the second rotating shaft (7) is separated from the first rotating shaft (4).

2. The exhaust fan according to claim 1, characterized in that, The drive unit (9) includes two sets of lead screw modules (9-1), which are respectively installed at both ends of the square tube (1a); The bevel gear transmission pair (9-2) connects the lead screws (9-1b) of the two sets of lead screw modules (9-1) and is used to make the mounting sliders (9-1c) of the two sets of lead screw modules (9-1) move in opposite directions; Two first connecting strips (9-3) are respectively hinged at one end to the mounting sliders (9-1c) of two sets of screw modules (9-1), and the other end is hinged to the fence plate (2); Two second connecting strips (9-4) are respectively hinged at one end to the mounting sliders (9-1c) of the two sets of lead screw modules (9-1), and the other end is hinged to the mounting part (3).

3. The exhaust fan according to claim 1, characterized in that, The rectangular mounting frame (1) has a groove (1b); in the first state, the edge of the fence panel (2) is in the groove (1b); the rectangular mounting frame (1) is also provided with multiple sets of telescopic bars (1c) that can restrict the fence panel (2) in the first state.

4. The exhaust fan according to claim 1, characterized in that, The impeller (8) includes: a mounting block (8-1) for mounting the second shaft (7) and a plurality of blades (8-2) detachably connected to the mounting block (8-1).

5. An exhaust fan according to claim 1, characterized in that, The square tube (1a) is oriented vertically.

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