Exhaust fan with noise reduction device

Abstract

The invention discloses an exhaust fan with a noise reduction device, and relates to the technical field of exhaust fans, the exhaust fan with the noise reduction device comprises an exhaust fan body, a mounting plate is fixedly mounted on the inner wall of the exhaust fan body, a motor is fixedly mounted on the outer wall of the mounting plate, and a rotating shaft is fixedly mounted at the output end of the motor; the exhaust fan with the noise reduction device comprises an exhaust fan body, a rotating shaft is arranged on the exhaust fan body, a fan is fixedly installed on the outer wall of the rotating shaft, a protective net is slidably connected to the inner wall of the exhaust fan body, an impurity removal mechanism is arranged on the exhaust fan body, a driving mechanism is arranged on the exhaust fan body, and a dredging mechanism is arranged on the driving mechanism. The swing rods can be driven to rotate back and forth on the outer wall of the exhaust fan body through rotation of the rotary disc in cooperation with the cross rods and the sliding grooves, plastic bags attached to the surface of the protective net can be pushed away through rotation of the swing rods in cooperation with the fixed blades, and the situation that the exhaust effect of the exhaust fan body is affected due to the fact that the plastic bags are attached to the surface of the protective net is avoided.

Description

Technical Field

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

[0002] Exhaust fans achieve ventilation by exhausting air from indoors or outdoors. The flow of air around the human body can promote the evaporation of body fluids, and exhaust fans play a role in natural cooling, thus avoiding discomfort caused by poor ventilation such as stuffiness, odor, dust, and smoke.

[0003] According to a disclosed combustion exhaust fan with noise reduction (publication number: CN221322863U), in the above application, because the filter is located at the air inlet of the device, when the device is working, a large amount of waste gas generated by cement combustion will enter. The filter can effectively block the entry of dust and other substances, thereby reducing the noise reduction effect of the device. A coating is provided on the surface of the filter to absorb dust in the exhaust gas, making it easy to clean.

[0004] Although the above patent can block dust and other substances in the air flow from entering the interior of the exhaust fan through the filter, when the exhaust fan adsorbs a plastic bag, the plastic bag will be adsorbed on the surface of the filter by the strong suction force of the exhaust fan. At this time, the plastic bag will clog the filter, causing the ventilation effect of the filter to be affected, thereby reducing the exhaust efficiency of the exhaust fan. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an exhaust fan with a noise reduction device, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an exhaust fan with a noise reduction device, comprising an exhaust fan body, a mounting plate fixedly installed on the inner wall of the exhaust fan body, a motor fixedly installed on the outer wall of the mounting plate, a rotating shaft fixedly installed on the output end of the motor, a fan fixedly installed on the outer wall of the rotating shaft, a protective net slidably connected to the inner wall of the exhaust fan body, a debris removal mechanism is arranged on the exhaust fan body, a driving mechanism is arranged on the exhaust fan body, and a dredging mechanism is arranged on the driving mechanism; wherein the debris removal mechanism comprises a support rod, a turntable, a cross rod, a swing rod, a slide groove, a fixed blade, a slider, a connecting rod, a movable blade, a push rod, a limit spring and a transmission belt, one end of the support rod is fixedly installed on the outer wall of the exhaust fan body, the other end of the support rod is rotatably connected with a turntable, the turntable and the rotating shaft are connected by a transmission belt, and the turntable The outer wall of the slider is fixedly provided with a cross bar, and the rotation of the turntable will drive the cross bar to make a circular motion around the support rod. The swing arm is hinged on the outer wall of the exhaust fan body, and a sliding groove is provided on the swing arm, and the outer wall of the cross bar is fitted with the inner wall of the sliding groove. When the cross bar makes a circular motion around the support rod, the cross bar will fit the inner wall of the sliding groove and move back and forth and push and pull the swing arm back and forth. A fixed blade is fixedly provided on the outer wall of the swing arm, and the plastic bag attached to the surface of the protective net can be cleaned by cooperating with the fixed blade through the reciprocating rotation of the swing arm. The inner wall of the swing arm is slidably connected with a slider, and one end of the connecting rod is fixedly provided with a side wall of the slider, and the other end of the connecting rod is fixedly provided with a movable blade, and the plastic bag grabbed by the fixed blade can be cut into pieces through the reciprocating movement of the movable blade. The outer wall of the slider is fixedly provided with a push rod, and the outer wall of the slider is fixedly provided with a limiting spring, and the end of the limiting spring away from the slider is fixedly provided on the inner wall of the swing arm.

[0007] According to the above technical scheme, the driving mechanism includes a swivel, an arc-shaped protrusion, a limit rod, a limit groove, an L rod, a return spring, a noise reduction plate, a sound absorption hole, an air outlet, sound insulation cotton, a fixed plate, a spiral groove and a ball head rod. The swivel is rotatably connected to the outer wall of the exhaust fan body. The outer wall of the swivel is fixedly installed with an arc-shaped protrusion. During the rotation of the swivel, the arc-shaped protrusion will drive the L rod to repeatedly squeeze the L rod. The outer wall of the swivel is fixedly installed with a limit rod, and a limit groove is provided on the rocker arm. The outer wall of the limit rod is attached to the inner wall of the limit groove. The reciprocating rotation of the rocker arm, in coordination with the limit groove and the limit rod, can drive the swivel to reciprocate on the outer wall of the exhaust fan body.

[0008] According to the above technical solution, one end of the L-rod is fixedly mounted on the outer wall of the protective net, the other end of the L-rod is fitted on the outer wall of the arc-shaped protrusion, one end of the return spring is fixedly mounted on the outer wall of the L-rod, and the other end of the return spring is fixedly mounted on the outer wall of the exhaust fan body. The elasticity of the return spring can drive the L-rod to move and reset, and the noise reduction plate is slidably connected to the inner wall of the exhaust fan body. Sound absorption holes are opened on the noise reduction plate, and air outlet holes are opened on the side walls of the noise reduction plate. Part of the airflow passing through the exhaust fan body will enter the interior of the sound absorption holes, and finally be discharged from the noise reduction plate through the air outlet holes opened on the side walls of the noise reduction plate.

[0009] According to the above technical solution, sound insulation cotton is placed inside the noise reduction plate, a fixing plate is fixedly installed on the outer wall of the noise reduction plate, a spiral groove is opened on the fixing plate, one end of the ball head rod is fixedly installed on the inner wall of the protective net, and the other end of the ball head rod is attached to the inner wall of the spiral groove. When the protective net slides back and forth on the inner wall of the exhaust fan body, it will drive the ball head rod to move back and forth on the inner wall of the spiral groove.

[0010] According to the above technical solution, the dredging mechanism includes a skateboard, a scraper, a through groove, a wave groove, a boss, a rubber wheel, an eccentric rod, a curved plate and a guide rod. The skateboard is slidably connected to the inner wall of the fixed plate, and the outer wall of the skateboard is fixedly installed with a scraper. The scraper is attached to the outer wall of the noise reduction plate. When the skateboard slides back and forth, it will drive the scraper to move synchronously with the outer wall of the noise reduction plate. The reciprocating movement of the scraper can push away the plastic bag fragments attached to the surface of the sound-absorbing hole.

[0011] According to the above technical solution, a through groove is provided on the skateboard, a wave groove is provided on the skateboard, a boss is fixedly installed on the outer wall of the noise reduction plate, the outer wall of the boss is rotatably connected to a rubber wheel, the rubber wheel is attached to the inner wall of the exhaust fan body, and the movement of the boss will drive the rubber wheel to roll back and forth on the inner wall of the exhaust fan body, thereby causing the rubber wheel to reciprocate on the outer wall of the boss, an eccentric rod is fixedly installed on the outer wall of the rubber wheel, and the outer wall of the eccentric rod is attached to the inner wall of the through groove, and when the rubber wheel rotates, the eccentric rod and the through groove can drive the skateboard to slide back and forth on the inner wall of the fixed plate.

[0012] According to the above technical solution, the inner wall of the noise reduction plate is slidably connected with an arc plate, the arc plate and the sound insulation cotton are fixedly installed, the outer wall of the arc plate is fixedly installed with a guide rod, the outer wall of the guide rod is fitted to the outer wall of the wave groove, and the reciprocating sliding of the slide plate in conjunction with the wave groove and the guide rod can drive the arc plate to slide reciprocally on the inner wall of the noise reduction plate.

[0013] According to the above technical solution, two groups of movable blades are provided, and the two groups of movable blades are mirror-imaged on both sides of the fixed blade with the fixed blade as the central axis.

[0014] The present invention provides an exhaust fan with a noise reduction device. It has the following beneficial effects:

[0015] 1. The exhaust fan with a noise reduction device can drive the swing arm to reciprocate on the outer wall of the exhaust fan body through the rotation of the turntable in coordination with the cross bar and the slide groove, and can push away the plastic bags attached to the surface of the protective net through the rotation of the swing arm in coordination with the fixed blade, so as to prevent the plastic bags from adhering to the surface of the protective net and affecting the exhaust effect of the exhaust fan body; and with the rotation of the turntable, in coordination with the cross bar, the top rod and the limit spring, the slider can be driven to slide back and forth on the inner wall of the swing arm, and the reciprocating sliding of the slider in coordination with the connecting rod and the movable blade can cut the plastic bags caught by the fixed blade into pieces, so that the plastic bags can be split into smaller plastic bags, so that the plastic bags can pass through the exhaust fan body and be discharged outdoors, thereby fully preventing the plastic bags from interfering with the exhaust effect of the exhaust fan body.

[0016] 2. The exhaust fan with a noise reduction device, when the swing arm reciprocates, cooperates with the limit groove and the limit rod to drive the swivel to reciprocate on the outer wall of the exhaust fan body; the reciprocating rotation of the swivel, in cooperation with the arc-shaped protrusion, the L-rod, and the return spring, can drive the protective net to slide back and forth on the inner wall of the exhaust fan body; the reciprocating sliding of the protective net can shake off the plastic bag fragments attached to its surface, thereby further improving the effect of cleaning plastic bags and effectively preventing plastic bags from adhering to the surface of the protective net; and with the reciprocating sliding of the protective net, in cooperation with the ball head rod, the spiral groove and the fixed plate, the noise reduction plate can be driven to slide back and forth on the inner wall of the exhaust fan body; the reciprocating sliding of the noise reduction plate, in cooperation with the sound-absorbing holes, the sound-insulating cotton, and the air outlet holes, can absorb the wind noise generated during the movement of the airflow, thereby reducing the noise generated during the operation of the exhaust fan body.

[0017] 3. The exhaust fan with a noise reduction device can drive the scraper to move back and forth on the outer wall of the noise reduction plate through the reciprocating sliding of the noise reduction plate in cooperation with the boss, rubber wheel, eccentric rod, through groove and slide plate. The scraper can be used to dredge the sound-absorbing holes to prevent the plastic bag fragments from sticking to the outside of the sound-absorbing holes, which will prevent the airflow from entering the inside of the noise reduction plate, thereby fully exerting the noise reduction effect of the noise reduction plate; and with the reciprocating sliding of the slide plate, in cooperation with the wave groove, guide rod and arc plate, the dust attached to the surface of the sound insulation cotton can be shaken off to prevent the dust in the airflow from adhering to the surface of the sound insulation cotton, which will affect the air permeability and sound insulation effect of the sound insulation cotton. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the exhaust fan of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the impurity removal mechanism and the rotating ring of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the protection net and the driving mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the overall structure of the noise reduction plate of the present invention;

[0023] Figure 6 Schematic diagram of the cross-sectional structure of the noise reduction plate of the present invention;

[0024] Figure 7 For the present invention Figure 1 A schematic diagram of the enlarged structure at point A;

[0025] Figure 8 For the present invention Figure 5 Schematic diagram of the enlarged structure at B.

[0026] In the figure: 1. exhaust fan body; 2. motor; 3. rotating shaft; 4. fan; 5. mounting plate; 6. protective net; 7. debris removal mechanism; 71. support rod; 72. turntable; 73. cross bar; 74. swing rod; 75. slide; 76. fixed blade; 77. slider; 78. connecting rod; 79. movable blade; 710. ejector rod; 711. limit spring; 712. transmission belt; 8. driving mechanism; 81. rotating ring; 82. arc-shaped protrusion ; 83. Limit rod; 84. Limit groove; 85. L rod; 86. Return spring; 87. Noise reduction plate; 88. Sound absorbing hole; 89. Air outlet; 810. Sound insulation cotton; 811. Fixed plate; 812. Spiral groove; 813. Ball head rod; 9. Clearing mechanism; 91. Slide plate; 92. Scraper; 93. Through groove; 94. Wave groove; 95. Boss; 96. Rubber wheel; 97. Eccentric rod; 98. Arc plate; 99. Guide rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 8, one embodiment of the present invention is: an exhaust fan with a noise reduction device, comprising an exhaust fan body 1, a mounting plate 5 is fixedly installed on the inner wall of the exhaust fan body 1, a motor 2 is fixedly installed on the outer wall of the mounting plate 5, a rotating shaft 3 is fixedly installed on the output end of the motor 2, a fan 4 is fixedly installed on the outer wall of the rotating shaft 3, the motor 2 is started to drive the rotating shaft 3 to rotate, and the rotating shaft 3 will drive the fan 4 to rotate synchronously during the rotation process, the inner wall of the exhaust fan body 1 is slidably connected with a protective net 6, and the exhaust fan body 1 is provided with a debris removal mechanism 7; wherein the debris removal mechanism 7 comprises a support rod 71, a rotating disk 72, a cross bar 73, a swing rod 74, a slide groove 75, a fixed blade 76, a slider 77, a connecting rod 78, a movable blade 79, a top rod 710, a limit spring 711 and a transmission belt 712, one end of the support rod 71 is fixedly installed on the outer wall of the exhaust fan body 1, the other end of the support rod 71 is rotatably connected with the rotating disk 72, and the rotating disk 72 and the rotating shaft 3 are connected by a transmission belt When the locking cam 73 is in the process of sliding, the locking cam 73 is in the process of sliding, and the locking cam 73 is in the process of sliding, so that the locking cam 73 can move freely, and the locking cam 73 of the locking cam 73 can move freely.

[0029] The swing arm 74 is hinged to the outer wall of the exhaust fan body 1, and a fixed blade 76 is fixedly installed on the outer wall of the swing arm 74. The reciprocating rotation of the swing arm 74 cooperates with the fixed blade 76 to push away the plastic bag on the surface of the protective net 6, so as to prevent the plastic bag from adhering to the surface of the protective net 6 and affecting the exhaust effect of the exhaust fan body 1. The inner wall of the swing arm 74 is slidably connected with a slider 77, one end of a connecting rod 78 is fixedly installed on the side wall of the slider 77, and the other end of the connecting rod 78 is fixedly installed with a movable blade 79. The reciprocating sliding of the slider 77 cooperates with the connecting rod 78 to drive the movable blade 79 to move back and forth on the side of the fixed blade 76, while the fixed blade 76 is in a stationary state. The relative movement of the movable blade 79 and the fixed blade 76 can shred the plastic bag grabbed by the fixed blade 76, so that the plastic bag can be split into smaller plastic bags, so that the plastic bag can pass through the exhaust fan body 1 and be discharged outdoors, so as to prevent the plastic bag from affecting the exhaust effect of the exhaust fan body 1.

[0030] When this embodiment is working: the motor 2 is started to drive the rotating shaft 3 to rotate, and the rotating shaft 3 will drive the fan 4 to rotate synchronously during the rotation. The rotation of the fan 4 can make the external air flow pass through the protective net 6 and enter the interior of the exhaust fan body 1, and finally be discharged from the exhaust fan body 1 through the side away from the protective net 6. At the same time, while the rotating shaft 3 is rotating, the transmission belt 712 can be used to drive the turntable 72 to rotate on the outer wall of the support rod 71. When the turntable 72 rotates, it will drive the cross bar 73 to make a circular motion around the support rod 71, and at the same time, the cross bar 73 will fit the inner wall of the slide groove 75. The swing rod 74 moves back and forth and pushes and pulls the swing rod 74 back and forth, so that the swing rod 74 rotates back and forth on the outer wall of the exhaust fan body 1. The swing rod 74 rotates back and forth while driving the fixed blade 76 to move back and forth in front of the protective net 6. When a plastic bag is adsorbed on the surface of the protective net 6 by the exhaust fan body 1, the fixed blade 76 pushes the plastic bag on the surface of the protective net 6 away during the reciprocating movement, so as to prevent the plastic bag from adhering to the surface of the protective net 6 and affecting the exhaust effect of the exhaust fan body 1. When the cross bar 73 moves in the process of being attached to the inner wall of the slide groove 75 and contacts the top rod 710, the cross bar 73 will When the push rod 710 is pushed, the push rod 710 drives the slider 77 to slide on the inner wall of the swing rod 74. At the same time, the slider 77 stretches the limit spring 711, and the slider 77 drives the connecting rod 78 to move synchronously while sliding. When the connecting rod 78 moves, it drives the side edges of the movable blade 79 and the fixed blade 76 to move synchronously. When the cross bar 73 moves along the inner wall of the slide groove 75 and gradually moves away from the push rod 710, the cross bar 73 will gradually break away from the squeezing of the push rod 710, so that the push rod 710 stops pushing the slider 77. At this time, the elasticity of the limit spring 711 Under the action, the slider 77 will gradually slide and reset on the inner wall of the rocker arm 74, and the slider 77 will drive the connecting rod 78 to move synchronously during the sliding and resetting process. At this time, the connecting rod 78 will drive the movable blade 79 to move and reset on the side of the fixed blade 76, so that the movable blade 79 can move back and forth on the side of the fixed blade 76, while the fixed blade 76 is in a stationary state. The plastic bag grabbed by the fixed blade 76 can be shredded through the relative movement of the movable blade 79 and the fixed blade 76, so that the plastic bag can be split into smaller plastic bags so that the plastic bags can pass through the exhaust fan body 1 and be discharged outdoors.

[0031] See also Figure 1-Figure 8On the basis of the above embodiment, another embodiment of the present invention further includes a driving mechanism 8 and a dredging mechanism 9, the driving mechanism 8 includes a swivel 81, an arc-shaped protrusion 82, a limit rod 83, a limit groove 84, an L rod 85, a reset spring 86, a noise reduction plate 87, a sound absorbing hole 88, an air outlet 89, a sound insulation cotton 810, a fixing plate 811, a spiral groove 812 and a ball head rod 813, the swivel 81 is rotatably connected to the outer wall of the exhaust fan body 1, the outer wall of the swivel 81 is fixedly installed with an arc-shaped protrusion 82, and the swivel During the rotation of the ring 81, the arc-shaped protrusion 82 will be driven to repeatedly squeeze the L rod 85. The outer wall of the rotating ring 81 is fixedly installed with a limit rod 83. A limit groove 84 is provided on the swing rod 74. The outer wall of the limit rod 83 fits the inner wall of the limit groove 84. The swing rod 74 reciprocates on the outer wall of the exhaust fan body 1 and cooperates with the limit groove 84 and the limit rod 83 to drive the rotating ring 81 to reciprocate on the outer wall of the exhaust fan body 1. One end of the reset spring 86 is fixedly installed on the outer wall of the L rod 85, and the other end of the reset spring 86 The end is fixedly mounted on the outer wall of the exhaust fan body 1, and the elasticity of the reset spring 86 can drive the L rod 85 to move and reset. The noise reduction plate 87 is provided with a sound absorbing hole 88, and the side wall of the noise reduction plate 87 is provided with an air outlet hole 89. Part of the airflow passing through the exhaust fan body 1 will enter the interior of the noise reduction plate 87 through the sound absorbing hole 88, and finally be discharged from the noise reduction plate 87 through the air outlet hole 89 provided on the side wall of the noise reduction plate 87. The outer wall of the noise reduction plate 87 is fixedly mounted with a fixing plate 811, and the fixing plate 811 is provided with a spiral groove 812 When the ball head rod 813 is fitted on the inner wall of the spiral groove 812 and moves back and forth, the ball head rod 813 will reciprocate and squeeze the spiral groove 812, so that the fixed plate 811 drives the noise reduction plate 87 to slide back and forth on the inner wall of the exhaust fan body 1. One end of the ball head rod 813 is fixedly installed on the inner wall of the protective net 6, and the other end of the ball head rod 813 is fitted on the inner wall of the spiral groove 812. When the protective net 6 slides back and forth on the inner wall of the exhaust fan body 1, it will drive the ball head rod 813 to move back and forth on the inner wall of the spiral groove 812.

[0032] One end of the L-rod 85 is fixedly mounted on the outer wall of the protective net 6, and the other end of the L-rod 85 is fitted on the outer wall of the arc-shaped protrusion 82. The L-rod 85 can drive the protective net 6 to slide back and forth on the inner wall of the exhaust fan body 1. The reciprocating sliding of the protective net 6 can shake off the plastic bag fragments attached to its surface, so that the plastic bag fragments can be separated from the protective net 6 and can be discharged from the exhaust fan body 1 under the suction action of the fan 4, thereby further improving the effect of cleaning the plastic bags and effectively preventing the plastic bags from adhering to the surface of the protective net 6.

[0033] The noise reduction plate 87 is slidably connected to the inner wall of the exhaust fan body 1, and sound insulation cotton 810 is placed inside the noise reduction plate 87. The reciprocating sliding of the noise reduction plate 87 can allow part of the airflow passing through the exhaust fan body 1 to fully enter the sound absorption hole 88. At this time, the sound insulation cotton 810 inside the noise reduction plate 87 can absorb the wind noise generated during the movement of the airflow, thereby reducing the noise generated during the operation of the exhaust fan body 1.

[0034] The dredging mechanism 9 includes a slide plate 91, a scraper plate 92, a through groove 93, a wave groove 94, a boss 95, a rubber wheel 96, an eccentric rod 97, an arc plate 98 and a guide rod 99. The slide plate 91 is provided with a through groove 93, and the slide plate 91 is provided with a wave groove 94. The outer wall of the noise reduction plate 87 is fixedly installed with a boss 95, and the outer wall of the boss 95 is rotatably connected with a rubber wheel 96. The rubber wheel 96 is attached to the inner wall of the exhaust fan body 1. During the movement of the boss 95, the rubber wheel 96 is driven to reciprocate and roll against the inner wall of the exhaust fan body 1, thereby causing the rubber wheel 96 to reciprocate on the outer wall of the boss 95. The outer wall of the rubber wheel 96 is fixedly installed with an eccentric rod 97, and the outer wall of the eccentric rod 97 is connected to the outer wall of the eccentric rod 97. The wall fits against the inner wall of the through groove 93. During the rotation of the rubber wheel 96, the eccentric rod 97 will be driven to fit against the inner wall of the through groove 93 and move back and forth. At the same time, the eccentric rod 97 will push and pull the slide plate 91 back and forth. A guide rod 99 is fixedly installed on the outer wall of the arc plate 98. When the wave groove 94 reciprocatingly squeezes the guide rod 99, the guide rod 99 will drive the arc plate 98 to slide back and forth on the inner wall of the noise reduction plate 87. The outer wall of the guide rod 99 fits against the outer wall of the wave groove 94. When the slide plate 91 slides back and forth on the inner wall of the fixed plate 811, the wave groove 94 will reciprocately squeeze the guide rod 99. There are two groups of movable blades 79, and the two groups of movable blades 79 are mirrored on both sides of the fixed blade 76 with the fixed blade 76 as the center axis.

[0035] The slide plate 91 is slidably connected to the inner wall of the fixed plate 811, and a scraper plate 92 is fixedly installed on the outer wall of the slide plate 91. The scraper plate 92 is attached to the outer wall of the noise reduction plate 87. When the slide plate 91 slides back and forth, it will drive the scraper plate 92 to move synchronously with the outer wall of the noise reduction plate 87. At this time, the scraper plate 92 can be used to clear the sound-absorbing holes 88 to prevent plastic bag fragments from sticking to the outside of the sound-absorbing holes 88, which will prevent the airflow from entering the inside of the noise reduction plate 87, thereby fully exerting the noise reduction effect of the noise reduction plate 87.

[0036] The inner wall of the noise reduction plate 87 is slidably connected to an arc plate 98, and the arc plate 98 is fixedly installed with the sound insulation cotton 810. The reciprocating sliding of the arc plate 98 can shake off the dust attached to the surface of the sound insulation cotton 810, thereby preventing the dust in the air flow from adhering to the surface of the sound insulation cotton 810 and affecting the air permeability and sound insulation effect of the sound insulation cotton 810.

[0037] When the present embodiment is working, while the swing rod 74 reciprocates on the outer wall of the exhaust fan body 1, the limit groove 84 provided on the swing rod 74 will reciprocate and push the limit rod 83, so that the limit rod 83 is fitted on the inner wall of the limit groove 84 and reciprocates and drives the swivel 81 to reciprocate on the outer wall of the exhaust fan body 1. During the rotation of the swivel 81, the arc-shaped protrusion 82 will be driven to repeatedly squeeze the L rod 85. When the arc-shaped protrusion 82 squeezes the L rod 85, the L rod 85 will drive the protective net 6 to slide toward the outside of the exhaust fan body 1. At the same time, the L rod 85 will stretch the reset spring 86. When the arc-shaped protrusion 82 gradually breaks away from the squeezing of the L rod 85, the elasticity of the reset spring 86 can drive the L rod 85 to move and reset. At this time, the L rod 85 will drive the protective net 6 to slide toward the inside of the exhaust fan body 1. The arc-shaped protrusion 82 repeatedly squeezes the L rod 85. At the same time, the elasticity of the reset spring 86 can make the protective net 6 slide back and forth on the inner wall of the exhaust fan body 1 The protective net 6 can slide back and forth on the inner wall of the exhaust fan body 1, and the ball head rod 813 can be pressed back and forth on the inner wall of the spiral groove 812 to make the fixing plate 811 drive the noise reduction plate 87 to slide back and forth on the inner wall of the exhaust fan body 1. The reciprocating sliding of the noise reduction plate 87 can make part of the airflow passing through the exhaust fan body 1 fully enter the interior of the sound absorbing hole 88, and finally be discharged from the noise reduction plate 87 through the air outlet 89 opened on the side wall of the noise reduction plate 87. After the airflow enters the interior of the noise reduction plate 87 through the sound absorbing hole 88, the sound insulation cotton 810 can be used to absorb the wind noise generated during the movement of the airflow, thereby reducing the noise generated during the operation of the exhaust fan body 1.

[0038] The noise reduction plate 87 will drive the boss 95 to move synchronously while sliding back and forth on the inner wall of the exhaust fan body 1. During the movement of the boss 95, the rubber wheel 96 will be driven to roll back and forth on the inner wall of the exhaust fan body 1, so that the rubber wheel 96 will reciprocate on the outer wall of the boss 95. During the rotation of the rubber wheel 96, the eccentric rod 97 will be driven to reciprocate on the inner wall of the through groove 93. At the same time, the eccentric rod 97 will push and pull the slide plate 91 back and forth, so that the slide plate 91 slides back and forth on the inner wall of the fixed plate 811. When the slide plate 91 slides back and forth, it will drive the scraper 92 to move synchronously on the outer wall of the noise reduction plate 87 At this time, the scraper 92 can be used to clear the sound-absorbing hole 88 to prevent the plastic bag fragments from sticking to the outside of the sound-absorbing hole 88, which will prevent the airflow from entering the interior of the noise reduction plate 87. While the slide plate 91 slides back and forth on the inner wall of the fixed plate 811, the wave groove 94 will reciprocate and squeeze the guide rod 99, so that the guide rod 99 drives the arc plate 98 to slide back and forth on the inner wall of the noise reduction plate 87. While the arc plate 98 slides back and forth, it can shake off the dust attached to the surface of the sound insulation cotton 810, so as to prevent the dust in the airflow from adhering to the surface of the sound insulation cotton 810, which will affect the air permeability and sound insulation effect of the sound insulation cotton 810.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust fan with a noise reduction device, comprising an exhaust fan body (1), characterized in that: The inner wall of the exhaust fan body (1) is fixedly mounted with a mounting plate (5), the outer wall of the mounting plate (5) is fixedly mounted with a motor (2), the output end of the motor (2) is fixedly mounted with a rotating shaft (3), the outer wall of the rotating shaft (3) is fixedly mounted with a fan (4), the inner wall of the exhaust fan body (1) is slidably connected with a protective net (6), the exhaust fan body (1) is provided with a debris removal mechanism (7), the exhaust fan body (1) is provided with a driving mechanism (8), and the driving mechanism (8) is provided with a dredging mechanism (9); The impurity removal mechanism (7) comprises a support rod (71), a rotating disk (72), a cross bar (73), a swing rod (74), a slide groove (75), a fixed blade (76), a slider (77), a connecting rod (78), a movable blade (79), a top rod (710), a limit spring (711) and a transmission belt (712); one end of the support rod (71) is fixedly mounted on the outer wall of the exhaust fan body (1); the other end of the support rod (71) is rotatably connected to the rotating disk (72); the rotating disk (72) and the rotating shaft (3) are connected by a transmission belt (712); the outer wall of the rotating disk (72) is fixedly mounted with a cross bar (73); the swing rod (74) is hinged to the exhaust fan body (1); ), a slide groove (75) is provided on the swing rod (74), the outer wall of the cross bar (73) is fitted on the inner wall of the slide groove (75), a fixed blade (76) is fixedly installed on the outer wall of the swing rod (74), a slider (77) is slidably connected to the inner wall of the swing rod (74), one end of the connecting rod (78) is fixedly installed on the side wall of the slider (77), the other end of the connecting rod (78) is fixedly installed on the outer wall of the slider (77), a push rod (710) is fixedly installed on the outer wall of the slider (77), a limit spring (711) is fixedly installed on the outer wall of the slider (77), and one end of the limit spring (711) away from the slider (77) is fixedly installed on the inner wall of the swing rod (74).

2. The exhaust fan with a noise reduction device according to claim 1, characterized in that: The driving mechanism (8) comprises a rotating ring (81), an arc-shaped protrusion (82), a limiting rod (83), a limiting groove (84), an L rod (85), a return spring (86), a noise reduction plate (87), a sound absorbing hole (88), an air outlet hole (89), sound insulation cotton (810), a fixing plate (811), a spiral groove (812) and a ball head rod (813); the rotating ring (81) is rotatably connected to the outer wall of the exhaust fan body (1); the outer wall of the rotating ring (81) is fixedly mounted with an arc-shaped protrusion (82); the outer wall of the rotating ring (81) is fixedly mounted with a limiting rod (83); the swing rod (74) is provided with a limiting groove (84); the outer wall of the limiting rod (83) is fitted to the inner wall of the limiting groove (84).

3. The exhaust fan with a noise reduction device according to claim 2, characterized in that: One end of the L-rod (85) is fixedly mounted on the outer wall of the protective net (6), and the other end of the L-rod (85) is in contact with the outer wall of the arc-shaped protrusion (82). One end of the return spring (86) is fixedly mounted on the outer wall of the L-rod (85), and the other end of the return spring (86) is fixedly mounted on the outer wall of the exhaust fan body (1). The noise reduction plate (87) is slidably connected to the inner wall of the exhaust fan body (1). A sound absorbing hole (88) is provided on the noise reduction plate (87), and an air outlet hole (89) is provided on the side wall of the noise reduction plate (87).

4. The exhaust fan with a noise reduction device according to claim 3, characterized in that: Sound insulation cotton (810) is placed inside the noise reduction plate (87), a fixing plate (811) is fixedly mounted on the outer wall of the noise reduction plate (87), a spiral groove (812) is provided on the fixing plate (811), one end of the ball head rod (813) is fixedly mounted on the inner wall of the protective net (6), and the other end of the ball head rod (813) is attached to the inner wall of the spiral groove (812).

5. The exhaust fan with a noise reduction device according to claim 4, characterized in that: The dredging mechanism (9) comprises a slide plate (91), a scraper plate (92), a through groove (93), a wave groove (94), a boss (95), a rubber wheel (96), an eccentric rod (97), an arc plate (98) and a guide rod (99); the slide plate (91) is slidably connected to the inner wall of the fixed plate (811); the outer wall of the slide plate (91) is fixedly mounted with a scraper plate (92); and the scraper plate (92) is attached to the outer wall of the noise reduction plate (87).

6. The exhaust fan with a noise reduction device according to claim 5, characterized in that: The slide plate (91) is provided with a through groove (93), the slide plate (91) is provided with a wave groove (94), the outer wall of the noise reduction plate (87) is fixedly mounted with a boss (95), the outer wall of the boss (95) is rotatably connected with a rubber wheel (96), the rubber wheel (96) is fitted on the inner wall of the exhaust fan body (1), the outer wall of the rubber wheel (96) is fixedly mounted with an eccentric rod (97), and the outer wall of the eccentric rod (97) is fitted on the inner wall of the through groove (93).

7. The exhaust fan with a noise reduction device according to claim 6, characterized in that: The inner wall of the noise reduction plate (87) is slidably connected to an arc plate (98), the arc plate (98) is fixedly mounted to the sound insulation cotton (810), the outer wall of the arc plate (98) is fixedly mounted to a guide rod (99), and the outer wall of the guide rod (99) is fitted to the outer wall of the wave groove (94).

8. The exhaust fan with a noise reduction device according to claim 7, characterized in that: The movable blades (79) are provided in two groups, and the two groups of movable blades (79) are mirror-imaged on both sides of the fixed blade (76) with the fixed blade (76) as the central axis.

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