Noise reduction mechanism of smoke prevention and exhaust fan and use method

Abstract

The invention discloses a noise reduction mechanism of a smoke prevention and exhaust fan and a using method, and relates to the technical field of noise reduction Mechaniss.In order to improve the noise reduction effect, the noise reduction mechanism comprises a noise reduction part for conducting noise reduction on a fan part, and the noise reduction part comprises a noise reduction box body and a noise reduction cover, the rotating handle is movably connected to the inner wall of a through hole formed in the bottom of the noise reduction box body, and an eccentric disc is fixed to the top of the rotating handle through a pin; the lining plate is welded to the inner wall of the bottom of the noise reduction box body; the using method of the noise reduction mechanism comprises the following steps that the positioning blocks are in butt joint with the grooves in the containing plate, and primary positioning of the draught fan body is completed. By arranging the compensation spring, the fan part has the displacement limit in the transverse direction after being clamped, when the fan part operates, the fan part can be buffered to a certain degree through the elastic force of the compensation spring, noise generated by vibration of the fan part is offset, and therefore the noise reduction effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction mechanisms, and in particular to a noise reduction mechanism for a smoke exhaust fan and a use method thereof. Background Art

[0002] In the prior art, a fire smoke exhaust fan is a machine that can quickly exhaust odor and oil smoke. The fire smoke exhaust fan will generate vibration noise during operation, and a noise reduction mechanism is needed to reduce vibration and noise, thereby reducing the noise of the fire smoke exhaust fan during startup and operation, and reducing the discomfort caused by the noise to personnel. The existing noise reduction mechanism for the fire smoke exhaust fan takes a long time to assemble between the noise reduction mechanism and the fan when in use, and cannot be quickly installed and disassembled for fans of different models; After searching, the Chinese patent application number 202221635604.x discloses a noise reduction mechanism for a single-speed smoke exhaust fan, including a single-speed fire smoke exhaust fan and a lower mounting seat, a base is arranged below the single-speed fire smoke exhaust fan, and a mounting assembly for disassembly and assembly is installed below the base, the mounting assembly includes a ball head column nail, a cup head bolt, a bearing, a ball head top column and a ball head tooth nail, and a cup head bolt is installed below the ball head column nail, and a bearing is arranged above the cup head bolt.

[0003] The noise reduction mechanism for a single-speed smoke exhaust fan in the above-mentioned patent has the following shortcomings: although the noise reduction of the smoke exhaust fan can be achieved by providing an adjustable shock absorbing assembly, a damper and other structures, when assembling the upper mounting base and the machine base, multiple sets of cup bolts need to be tightened to achieve the fixed installation between the two, which requires a long time for assembly. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a noise reduction mechanism and a method of using a smoke exhaust fan.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A noise reduction mechanism for a smoke exhaust fan includes a noise reduction unit for reducing the noise of a fan unit, the noise reduction unit including: Noise reduction box: its inner wall is paved with sound insulation cotton; Rotating handle: It is movably connected to the inner wall of the through hole opened at the bottom of the noise reduction box, and an eccentric disk is fixed to the top of the rotating handle by a pin; Lining plate: It is welded to the inner wall of the bottom of the noise reduction box, and the through hole opened on the surface of the lining plate is movably connected with a T-shaped rod, and a connecting frame is welded at one end of the T-shaped rod; Swing arm: Its two ends are movably connected to the top of the eccentric disk and the inner wall of the connecting frame respectively; Hollow cylinder: It is movably connected to the outer wall of the T-shaped rod, and a same compensation spring is fixed between the inner wall of one side of the hollow cylinder and one end of the T-shaped rod by means of a clamping connection; Side plate: It is welded to one end of the hollow cylinder, and a second housing shell is welded to the inner wall of one side of the side plate; The first accommodating shell is welded to the top of the eccentric disk, and the first accommodating shell is movably connected with the second ball head rod, and the first accommodating shell and the second accommodating shell are both filled with sponge; Sliding sleeve: It is welded to the top of the ball head rod, and the inner wall of the sliding sleeve is movably connected with a guide column; Ball rod 1: It is welded to one end of the guide column, and the outer wall of the ball rod 1 is movably connected to the inside of the accommodating shell 2; Clamping plate: It is welded to the outer wall of the guide column, and the fan part is clamped and fixed by two clamping plates.

[0006] Preferably: a ratchet is welded on the circumferential outer wall of the rotating handle, a rectangular plate is welded on the bottom of the noise reduction box, and a sliding rod is movably connected to the inner wall of the through hole opened on the surface of the rectangular plate, and a limiting tooth used in conjunction with the ratchet is fixed to one end of the sliding rod, a limiting spring is sleeved on the outer wall of the sliding rod, and two ends of the limiting spring are respectively fixed to the inner wall of one side of the sliding rod and the outer wall of one side of the rectangular plate by means of clamping.

[0007] Preferably: a vertical plate is welded at the bottom of the noise reduction box, and an electric telescopic rod is fixed to the outer wall of one side of the vertical plate, a sealing plate is fixed to the output end of the electric telescopic rod through a pin, and sound insulation cotton is bonded to the inner wall of one side of the sealing plate.

[0008] As a preferred embodiment of the present invention: a placement plate is welded to an outer wall of one side of the sealing plate, and the fan unit is installed on the upper surface of the placement plate.

[0009] As a preferred embodiment of the present invention: the fan part includes a fan body, a mounting plate and a positioning block, the positioning block is integrally formed at the bottom of the mounting plate, and a groove matching the positioning block is opened on the surface of the placement plate, and the fan body is welded to the top outer wall of the mounting plate.

[0010] As a preferred embodiment of the present invention, both sides of the mounting plate are provided with card slots, and a card block used in conjunction with the card slots is welded to the inner wall of one side of the clamping plate.

[0011] Further: a conical rod 1 is movably connected to the outer wall of one side of the sealing plate, and a connecting column is welded at one end of the conical rod 1, and a conical rod 2 is welded at one end of the connecting column away from the conical rod 1.

[0012] As a further solution of the present invention: the through holes opened on both sides of the noise reduction box are embedded with air outlet filters.

[0013] As a further solution of the present invention: a limiting hole matching the outer diameter of the first tapered rod and the second tapered rod is opened on the surface of the sliding sleeve.

[0014] A method for using a noise reduction mechanism of a smoke exhaust fan comprises the following steps: S1: Docking the positioning block with the groove on the placement plate to complete the preliminary positioning of the fan body; S2: Use the electric telescopic rod to drive the sealing plate to move so that the sealing plate seals the noise reduction box; S3: The fan body uses the sound insulation cotton in the noise reduction box to reduce noise when it is in operation; S4: By filling the interior of the accommodating shell 1 and the interior of the accommodating shell 2 with sponge, when the fan main body is in operation, buffering, vibration reduction and noise reduction of the fan main body are achieved from multiple directions.

[0015] The beneficial effects of the present invention are: 1. The transmission effect of the swing arm can be used to convert the circular motion of the eccentric disk into the linear motion of the T-bar along the liner. The movement directions of the two sets of T-bars are opposite. During the relative motion, the two T-bars drive the two sets of clamping plates to move relative to each other to quickly clamp and fix the fan part from both sides.

[0016] 2. By providing a compensation spring, the fan unit has a lateral displacement limit after being clamped. When the fan unit is in operation, the elastic force of the compensation spring can buffer the fan unit to a certain extent, offsetting the noise generated by the vibration of the fan unit, thereby improving the noise reduction effect.

[0017] 3. By providing the second ball head rod and the first ball rod, the fan unit has a certain degree of displacement limit in the up and down and left and right directions after installation, so that during the operation of the fan unit, its movement direction is not limited to the horizontal direction, but can play a buffering role on the fan unit in different directions such as horizontal, vertical and oblique directions.

[0018] 4. By filling the interior of the accommodating shell 1 and the interior of the accommodating shell 2 with sponge, the sponge is used to improve the buffering effect, so that when the fan part is operating, vibration and noise reduction of the fan part can be achieved in multiple directions.

[0019] 5. By utilizing the characteristic that the ratchet can only rotate in one direction along the surface of the limiting tooth, the limiting tooth can limit the ratchet after it rotates a certain angle. By adjusting the rotation amplitude of the ratchet, the compression amplitude of the compensation spring can be adjusted.

[0020] 6. By providing a tapered rod 1 and a connecting column, when the tapered rod 1 contacts the limiting hole, the guide column, the sliding sleeve and the T-bar are ensured to be in a parallel state, which facilitates relative sliding between the guide column and the sliding sleeve, and ensures that the two clamping plates clamp and limit the mounting plate. When the connecting column moves to the limiting hole, the gap between the connecting column and the limiting hole is utilized. This gap allows the sliding sleeve and the guide column to move in different directions within a certain range, thereby achieving vibration reduction and noise reduction for the fan unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 2 It is a bottom structural schematic diagram of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 3 It is a side cross-sectional structural schematic diagram of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 4 It is a schematic diagram of the overall explosion structure of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 5 It is a schematic diagram of the explosion structure of the fan main body installation of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 6 It is a schematic diagram of the fan main body installation structure of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Figure 7 It is a schematic diagram of the partial structure of the clamping part of the noise reduction mechanism of the smoke exhaust fan proposed by the present invention; Figure 8 It is a schematic diagram of the overall structure of a clamping part of a noise reduction mechanism of a smoke exhaust fan proposed by the present invention; Fig. 9 It is a schematic diagram of the explosion structure of the clamping part of the noise reduction mechanism of the smoke exhaust fan proposed by the present invention.

[0022] In the figure: 1-noise reduction box, 2-air outlet filter, 3-vertical plate, 4-electric telescopic rod, 5-rotating handle, 6-ratchet, 7-fan body, 8-mounting plate, 9-side plate, 10-card slot, 11-hollow cylinder, 12-positioning block, 13-sealing plate, 14-placing plate, 15-conical rod one, 16-connecting column, 17-conical rod two, 18-ball head rod one, 19-clamping plate, 20-guide column, 21-connecting frame, 22-limiting hole, 23-eccentric disk, 24-T-rod, 25-compensation spring, 26-rectangular plate, 27-limiting spring, 28-sliding rod, 29-limiting tooth, 30-card block, 31-ball head rod two, 32-accommodating shell one, 33-swing arm, 34-lining plate, 35-accommodating shell two, 36-sleeve. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the term "plurality" shall mean two or more.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Embodiment 1: A noise reduction mechanism for a smoke exhaust fan, such as Figures 1 to 9 As shown, a noise reduction unit is included for reducing the noise of the fan unit, and the noise reduction unit includes: Noise reduction box 1: its inner wall is paved with sound insulation cotton; Rotating handle 5: It is rotatably connected to the inner wall of the through hole opened at the bottom of the noise reduction box 1, and an eccentric disk 23 is fixed to the top of the rotating handle 5 by a pin; The lining plate 34 is welded to the inner wall of the bottom of the noise reduction box 1, and the through hole on the surface of the lining plate 34 is slidably connected with the T-shaped rod 24, and one end of the T-shaped rod 24 is welded with the connecting frame 21; The swing arm 33: its two ends are rotatably connected to the top of the eccentric disc 23 and the inner wall of the connecting frame 21; Hollow cylinder 11: It is slidably connected to the outer wall of the T-shaped rod 24, and a compensating spring 25 is fixed between the inner wall of one side of the hollow cylinder 11 and one end of the T-shaped rod 24 by means of a clamping connection; Side plate 9: It is welded to one end of the hollow cylinder 11, and a second accommodating shell 35 is welded to the inner wall of one side of the side plate 9; The accommodating shell 1 32 is welded to the top of the eccentric disk 23, and the accommodating shell 1 32 is rotatably connected with the ball head rod 2 31, and the interior of the accommodating shell 1 32 and the interior of the accommodating shell 2 35 are filled with sponge; Sliding sleeve 36: It is welded to the top of the ball head rod 31, and the inner wall of the sliding sleeve 36 is slidably connected with the guide post 20; Ball rod 18: It is welded to one end of the guide pillar 20, and the outer wall of the ball rod 18 is movably connected to the inside of the accommodating shell 2 35; Clamping plate 19: It is welded to the outer wall of the guide column 20, and the fan part is clamped and fixed by two clamping plates 19; When the fan unit needs to reduce noise, the fan unit is easily installed by providing a noise reduction box 1, so that the fan unit is arranged inside the noise reduction box 1 in a built-in manner. Since the inner wall of the noise reduction box 1 is paved with sound insulation cotton, when the fan unit is in operation, the sound insulation cotton is used to effectively isolate the noise generated by the fan unit during operation, thereby improving the noise reduction effect; When the fan unit needs to be installed, firstly, for fan units of different specifications, the rotating handle 5 is rotated so that the rotating handle 5 drives the eccentric disk 23 to rotate during the rotation process, and the transmission effect of the swing arm 33 can be used to convert the circular motion of the eccentric disk 23 into the linear motion of the T-shaped rod 24 along the lining plate 34. In this embodiment, the number of T-shaped rods 24 is preferably two groups, and the movement directions of the two groups of T-shaped rods 24 are opposite. During the relative motion process, the two T-shaped rods 24 respectively drive the two groups of clamping plates 19 to move relative to each other to clamp and fix the fan unit from both sides; After the fan unit is fixed, since a compensation spring 25 is provided between the T-bar 24 and the hollow cylinder 11, the fan unit still has a displacement limit in the lateral direction after being clamped. When the fan unit is in operation, the elastic force of the compensation spring 25 can buffer the fan unit to a certain extent, offsetting the noise generated by the vibration of the fan unit, thereby improving the noise reduction effect; Synchronously, by providing the ball head rod 2 31 and the ball rod 1 18, the fan unit has a certain degree of displacement limit in the up and down and left and right directions after installation, so that during the operation of the fan unit, its movement direction is not limited to the horizontal direction, but can play a buffering role on the fan unit in different directions such as horizontal, vertical and oblique directions. By filling the inside of the accommodating shell 1 32 and the inside of the accommodating shell 2 35 with sponge, the sponge is used to improve the buffering effect, so that when the fan unit is in operation, the vibration of the fan unit can be reduced in multiple directions, thereby improving the noise reduction effect.

[0030] Furthermore, a ratchet 6 is welded to the outer circumferential wall of the rotating handle 5, a rectangular plate 26 is welded to the bottom of the noise reduction box 1, and a slide bar 28 is slidably connected to the inner wall of the through hole opened on the surface of the rectangular plate 26, and a limit tooth 29 used in conjunction with the ratchet 6 is fixed to one end of the slide bar 28 by screws, a limit spring 27 is sleeved on the outer wall of the slide bar 28, and two ends of the limit spring 27 are respectively fixed to the inner wall of one side of the slide bar 28 and the outer wall of one side of the rectangular plate 26 by a clamping method; After the fan part is clamped and fixed, in order to avoid a large movement of the position of the clamping plate 19 after clamping, the characteristic that the ratchet 6 can only rotate in one direction along the surface of the limiting tooth 29 is utilized, so that the limiting tooth 29 can limit the position of the ratchet 6 after it rotates a certain angle. When the clamping plate 19 moves to contact the fan part, when the rotating handle 5 continues to be rotated, the compensation spring 25 is deformed. By adjusting the rotation amplitude of the ratchet 6, the compression amplitude of the compensation spring 25 can be adjusted conveniently.

[0031] Furthermore, a vertical plate 3 is welded to the bottom of the noise reduction box 1, and an electric telescopic rod 4 is fixed to the outer wall of one side of the vertical plate 3 by bolts, a sealing plate 13 is fixed to the output end of the electric telescopic rod 4 by a pin, and sound insulation cotton is bonded to the inner wall of one side of the sealing plate 13, a placement plate 14 is welded to the outer wall of one side of the sealing plate 13, and the fan part is installed on the upper surface of the placement plate 14; By providing an electric telescopic rod 4, the sealing plate 13 can be driven to move horizontally, and the fan unit can be placed using the placement plate 14. During installation, after the fan unit is placed on the placement plate 14, the electric telescopic rod 4 drives the placement plate 14 to move in the reverse direction, so that the fan unit moves into the noise reduction box 1.

[0032] Furthermore, the fan unit includes a fan body 7, a mounting plate 8 and a positioning block 12, the positioning block 12 is integrally formed at the bottom of the mounting plate 8, and a groove adapted to the positioning block 12 is opened on the surface of the placement plate 14, and the fan body 7 is welded to the top outer wall of the mounting plate 8; The positioning block 12 and the groove can be used to quickly position the mounting plate 8 and the placement plate 14 during installation, thereby preventing the mounting plate 8 from being laterally displaced relative to the placement plate 14 .

[0033] Furthermore, the through holes opened on both sides of the noise reduction box 1 are embedded with air outlet filters 2; The air outlet filter 2 is provided to facilitate the fan body 7 to suck and blow air when started, so that the wind is discharged through one of the air outlet filters 2.

[0034] Furthermore, both sides of the mounting plate 8 are provided with card slots 10, and a card block 30 used in conjunction with the card slots 10 is welded on the inner wall of one side of the clamping plate 19; By providing the clamping block 30 and the clamping groove 10 , the mounting plate 8 can be limited in the lateral direction during the process of the clamping plate 19 clamping the mounting plate 8 , thereby ensuring the stability between the mounting plate 8 and the clamping plate 19 .

[0035] Furthermore, a conical rod 15 is slidably connected to the outer wall of one side of the sealing plate 13, and a connecting column 16 is welded to one end of the conical rod 15, and a conical rod 2 17 is welded to one end of the connecting column 16 away from the conical rod 15, and a limiting hole 22 adapted to the outer diameter of the conical rod 15 and the conical rod 2 17 is opened on the surface of the sliding sleeve 36; When the two clamping plates 19 move relative to each other to clamp the mounting plate 8, in order to ensure that the guide post 20 and the sliding sleeve 36 are in parallel with each other and the T-bar 24, the guide post 20 and the sliding sleeve 36 can slide relative to each other to avoid the guide post 20 being stuck when it needs to slide along the sliding sleeve 36 due to the relative inclination between the guide post 20, the sliding sleeve 36 and the T-bar 24. When the sealing plate 13 moves in the direction close to the noise reduction box 1, the conical rod 17 slides along the limiting hole 22 during this process. The inner diameters of the holes 22 are interference fit to guide the positions of the guide posts 20 and the sleeves 36, so that the guide posts 20 and the sleeves 36 are parallel to the T-bar 24. When the block 30 is inserted into the inner wall of the slot 10, the conical rod 15 is slid along the noise reduction box 1, so that the connecting post 16 moves to the limiting hole 22. At this time, there is a certain gap between the connecting post 16 and the limiting hole 22. This gap allows the sleeve 36 and the guide post 20 to move in different directions within a certain range, thereby achieving vibration reduction and noise reduction for the fan unit.

[0036] When the embodiment is in use, the electric telescopic rod 4 is first used to drive the sealing plate 13 to move and open, and then the positioning block 12 is connected to the groove on the placement plate 14. After the connection, the electric telescopic rod 4 is used to drive the sealing plate 13 to move in the opposite direction, so that the sealing plate 13 gradually moves in the direction close to the noise reduction box body 1. When the sealing plate 13 and the side wall of the noise reduction box body 1 are in contact with each other, the slot 10 and the block 30 are in a facing position. Then, the rotating handle 5 is rotated to make the eccentric disk 23 drive the two blocks 30 to move relative to each other during the rotation process, and the two blocks 30 are used to limit the mounting plate 8. When the fan body 7 is started, the sound insulation cotton is used to effectively isolate the noise generated by the fan part during operation, thereby improving the noise reduction effect. By filling the interior of the accommodating shell 1 32 and the interior of the accommodating shell 2 35 with sponge, the sponge is used to improve the buffering effect, so that when the fan part is in operation, the vibration reduction of the fan part can be achieved from multiple directions, thereby improving the noise reduction effect.

[0037] Embodiment 2: A method for using a noise reduction mechanism of a smoke exhaust fan comprises the following steps: S1: docking the positioning block 12 with the groove on the placement plate 14 to complete the preliminary positioning of the fan body 7; S2: Using the electric telescopic rod 4 to drive the sealing plate 13 to move so that the sealing plate 13 seals the noise reduction box 1; S3: The fan body 7 uses the sound insulation cotton in the noise reduction box 1 to reduce noise during operation; S4: By filling the interior of the accommodating shell 1 32 and the interior of the accommodating shell 2 35 with sponge, when the fan body 7 is in operation, buffering, vibration reduction and noise reduction of the fan body 7 are achieved from multiple directions.

[0038] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A noise reduction mechanism for a smoke exhaust fan, comprising a noise reduction unit for reducing the noise of a fan unit, characterized in that: The noise reduction unit comprises: Noise reduction box (1): its inner wall is paved with sound insulation cotton; A rotating handle (5) is movably connected to the inner wall of a through hole formed at the bottom of the noise reduction housing (1), and an eccentric disk (23) is fixed to the top of the rotating handle (5) via a pin; A lining plate (34): the lining plate (34) is welded to the inner wall of the bottom of the noise reduction box (1), and a through hole provided on the surface of the lining plate (34) is movably connected to a T-shaped rod (24), and a connecting frame (21) is welded to one end of the T-shaped rod (24); Swing arm (33): two ends of which are movably connected to the top of the eccentric disk (23) and the inner wall of the connecting frame (21); Hollow cylinder (11): movably connected to the outer wall of the T-shaped rod (24), and a same compensation spring (25) is fixed between the inner wall of one side of the hollow cylinder (11) and one end of the T-shaped rod (24) by means of a clamping connection; Side plate (9): welded to one end of the hollow cylinder (11), and a second accommodating shell (35) is welded to the inner wall of one side of the side plate (9); The first accommodating shell (32) is welded to the top of the eccentric disk (23), and the first accommodating shell (32) is movably connected to the second ball head rod (31), and the interior of the first accommodating shell (32) and the interior of the second accommodating shell (35) are both filled with sponge; Sliding sleeve (36): It is welded to the top of the second ball head rod (31), and the inner wall of the sliding sleeve (36) is movably connected to the guide post (20); Spherical rod 1 (18): It is welded to one end of the guide column (20), and the outer wall of the spherical rod 1 (18) is movably connected to the inside of the accommodating shell 2 (35); Clamping plate (19): It is welded to the outer wall of the guide column (20), and the fan part is clamped and fixed by two clamping plates (19).

2. The noise reduction mechanism of a smoke exhaust fan according to claim 1 is characterized in that: A ratchet (6) is welded to the circumferential outer wall of the rotating handle (5), a rectangular plate (26) is welded to the bottom of the noise reduction box (1), and a sliding rod (28) is movably connected to the inner wall of a through hole opened on the surface of the rectangular plate (26), and a limiting tooth (29) used in conjunction with the ratchet (6) is fixed to one end of the sliding rod (28), and a limiting spring (27) is sleeved on the outer wall of the sliding rod (28), and two ends of the limiting spring (27) are respectively fixed to the inner wall of one side of the sliding rod (28) and the outer wall of one side of the rectangular plate (26) by a clamping method.

3. The noise reduction mechanism of a smoke exhaust fan according to claim 2 is characterized in that: A vertical plate (3) is welded to the bottom of the noise reduction box (1), and an electric telescopic rod (4) is fixed to an outer wall of one side of the vertical plate (3); a sealing plate (13) is fixed to the output end of the electric telescopic rod (4) via a pin, and sound insulation cotton is bonded to an inner wall of one side of the sealing plate (13).

4. The noise reduction mechanism of a smoke exhaust fan according to claim 3 is characterized in that: A placement plate (14) is welded to an outer wall on one side of the sealing plate (13), and the fan unit is mounted on the upper surface of the placement plate (14).

5. The noise reduction mechanism of a smoke exhaust fan according to claim 4 is characterized in that: The fan section comprises a fan body (7), a mounting plate (8) and a positioning block (12); the positioning block (12) is integrally formed at the bottom of the mounting plate (8), and a groove matching the positioning block (12) is provided on the surface of the placement plate (14); the fan body (7) is welded to the top outer wall of the mounting plate (8).

6. A noise reduction mechanism for a smoke exhaust fan according to claim 5, characterized in that: The mounting plate (8) is provided with a clamping groove (10) on both sides, and a clamping block (30) for use with the clamping groove (10) is welded to the inner wall of one side of the clamping plate (19).

7. A noise reduction mechanism for a smoke exhaust fan according to claim 6, characterized in that: The outer wall of one side of the sealing plate (13) is movably connected to a conical rod 1 (15), and a connecting column (16) is welded to one end of the conical rod 1 (15), and a conical rod 2 (17) is welded to the end of the connecting column (16) away from the conical rod 1 (15).

8. The noise reduction mechanism of a smoke exhaust fan according to claim 7, characterized in that: The through holes on both sides of the noise reduction box (1) are embedded with air outlet filters (2).

9. The noise reduction mechanism of a smoke exhaust fan according to claim 8, characterized in that: The surface of the sliding sleeve (36) is provided with a limiting hole (22) adapted to the outer diameter of the first tapered rod (15) and the second tapered rod (17).

10. A method for using the noise reduction mechanism of a smoke exhaust fan according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: docking the positioning block (12) with the groove on the placement plate (14) to complete the preliminary positioning of the fan body (7); S2: using the electric telescopic rod (4) to drive the sealing plate (13) to move so that the sealing plate (13) seals the noise reduction box (1); S3: The fan body (7) uses the sound insulation cotton in the noise reduction box (1) to reduce noise during operation; S4: The interior of the first accommodating shell (32) and the interior of the second accommodating shell (35) are filled with sponge, so that when the fan main body (7) is in operation, buffering, vibration reduction and noise reduction are achieved from multiple directions for the fan main body (7).

Images