Ultra-low noise axial flow fan with silencer

Abstract

The invention relates to the field of axial flow fans, and discloses an ultra-low noise axial flow fan with a silencer, the ultra-low noise axial flow fan comprises a fan shell, a motor and blades, the motor and the blades are arranged in the fan shell, a motor frame is fixedly arranged in the fan shell, the motor is fixedly arranged in the motor frame, and a driving shaft is fixedly arranged at the output end of the motor; the blades are fixedly installed on the shaft wall of the driving shaft, and a silencer shell is fixedly arranged on one side of the fan shell. According to the ultra-low-noise axial flow fan with the silencer, noise is absorbed through the silencing material layer in the silencing mechanism, airflow is guided in cooperation with the wind scooper, the ultra-low-noise effect is achieved, and the silencing material is convenient to replace due to the detachable design of the silencing bed; by means of sound pressure piston and piston rod scales of the noise detection mechanism, the loss state of the silencing material can be visually monitored, and long-term stable operation is guaranteed; the cleaning brush is driven by the speed reduction transmission mechanism to clean the filter screen, so that impurity blockage is prevented, the maintenance frequency is reduced, and the disassembly and assembly convenience and the operation safety are improved.

Description

Technical Field

[0001] The present invention relates to the field of axial flow fans, in particular to an ultra-low noise axial flow fan with a muffler. Background Art

[0002] Axial flow fans are widely used in industrial ventilation, HVAC systems, and large equipment cooling due to their high air volume and moderate air pressure. However, the aerodynamic noise (such as airflow turbulence caused by rotating blades) and mechanical vibration noise generated during operation can impact the working environment and the lives of surrounding residents. With increasing environmental protection requirements and noise control standards, "ultra-low noise" has become a key development direction for axial flow fans.

[0003] To achieve the goal of ultra-low noise, the existing technology generally installs a silencer at the air outlet of the axial flow fan, absorbs medium and high frequency noise by filling the interior with porous sound-absorbing materials (such as glass wool and polyester fiber), and weakens low frequency noise with a resistant structure, thereby greatly reducing the noise radiation of the air outlet. However, the sound absorption effect of the silencer is highly dependent on the integrity of the internal sound-absorbing material. During long-term operation, the material will experience fiber shedding, pore blockage or aging and deterioration due to factors such as high-speed airflow scouring, dust erosion, and temperature and humidity changes, resulting in a gradual attenuation of the sound absorption performance. At present, the silencers of existing axial flow fans lack effective detection methods for the status of the internal sound-absorbing materials. Since the silencer is usually a closed structure, it is difficult to directly observe or monitor the loss of the material. The silencer can only be disassembled for inspection after the overall noise of the fan has increased significantly. At this time, the material is often severely damaged, which not only affects the ultra-low noise performance of the fan, but may also cause noise to exceed the standard due to the failure of the silencer, and may even require shutdown for maintenance, causing production delays.

[0004] Therefore, an ultra-low noise axial flow fan with a muffler is proposed. Summary of the Invention

[0005] (1) Technical problems solved In view of the deficiencies in the prior art, the present invention provides an ultra-low noise axial flow fan with a muffler, which solves the problems raised in the background art.

[0006] (2) Technical solution To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an ultra-low noise axial flow fan with a muffler, comprising a fan housing and a motor and blades arranged inside the fan housing, a motor frame fixedly provided inside the fan housing, the motor fixedly arranged inside the motor frame, a drive shaft fixedly provided at the output end of the motor, the blades fixedly mounted on the shaft wall of the drive shaft, a muffler housing fixedly provided on one side of the fan housing, a muffler mechanism provided inside the muffler housing, and noise detection mechanisms provided on the top inner wall of the muffler housing and on both sides of the muffler mechanism; A filter is fixedly provided inside the muffler housing and on one side close to the fan housing. A cleaning mechanism is provided on one side of the filter, and the cleaning mechanism is connected to one end of the drive shaft.

[0007] Preferably, the silencer mechanism includes an annular fixing plate located inside the silencer housing, a silencer bed is fixedly provided inside the annular fixing plate, the silencer bed is filled with a layer of silencer material inside, an air guide cover is fixedly provided on the side of the silencer bed facing the fan housing, and the open side of the air guide cover is fixedly connected to the inner wall of the silencer housing.

[0008] Preferably, the sound-absorbing bed includes a bed body fixedly arranged inside the annular fixing plate, a bedspread is provided on one side of the bed body, the bed body and the bedspread are fixedly connected by the cooperation of a threaded ring and a threaded groove, the side walls of the bed body and the side walls of the bedspread are both provided with through holes, and the sound-absorbing material layer is located inside the bed body and the bedspread.

[0009] Preferably, the noise detection mechanism includes two fixed rods fixedly arranged on the top inner wall of the muffler shell, the lower ends of the two fixed rods are fixed with the same piston cylinder, a sound pressure piston is slidably provided inside the piston cylinder, the top of the sound pressure piston is fixed with a piston rod extending to the outside of the muffler shell, the rod wall of the piston rod is sleeved with a spring, and the two ends of the spring are respectively fixedly connected to the top of the sound pressure piston and the top inner wall of the piston cylinder.

[0010] Preferably, the rod wall of the piston rod is provided with scale lines, and an airflow baffle is fixedly provided at the bottom opening of the piston cylinder.

[0011] Preferably, the cleaning mechanism includes a cleaning brush located on one side of the filter screen, a rotating shaft is fixedly provided in the middle of the cleaning brush, and a speed reduction transmission mechanism is provided between the rotating shaft and the drive shaft.

[0012] Preferably, the speed reduction transmission mechanism includes a support rod fixedly arranged on the bottom inner wall of the fan casing, the upper end of the support rod is fixedly provided with a box body, one end of the drive shaft extends to the interior of the box body and is fixedly provided with a first small gear, the interior of the box body is provided with a transmission shaft for horizontal rotation, the shaft wall of the transmission shaft is fixedly provided with a first large gear, the first small gear and the first large gear are meshed together, the shaft wall of the transmission shaft is fixedly provided with a second small gear, one end of the rotating shaft extends to the interior of the box body and is fixedly provided with a second large gear, and the second small gear is meshed together with the second large gear.

[0013] Preferably, the fan housing and the muffler housing are fixedly connected by a bolt assembly, and a protective net is fixedly provided on one side of the air inlet of the fan housing.

[0014] (3) Beneficial effects Compared with the prior art, the present invention provides an ultra-low noise axial flow fan with a muffler, which has the following beneficial effects: 1. This ultra-low noise axial flow fan with a silencer is equipped with a silencer mechanism and a silencer bed fixed with an annular fixing plate. The internal silencer material layer absorbs noise through the through holes on the side walls of the bed body and the bedspread, and cooperates with the air guide cover to guide the air flow in smoothly, effectively reducing the operating noise of the fan and achieving an ultra-low noise effect. At the same time, the bed body and the bedspread are detachably connected through a threaded ring and a threaded groove, which facilitates the later replacement of the silencer material layer to maintain the silencer performance.

[0015] 2. This ultra-low noise axial flow fan with a silencer has noise detection mechanisms on both sides of the silencer mechanism. It uses sound pressure to push the sound pressure piston in the piston cylinder to drive the piston rod to move. Combined with the air flow baffle to reduce air flow interference, the scale line on the piston rod can intuitively reflect the sound pressure change, realize real-time monitoring of the loss status of the silencer material layer, avoid the situation where maintenance is carried out after the silencer fails, and ensure the long-term stable operation of the fan.

[0016] 3. This ultra-low noise axial flow fan with silencer is equipped with a cleaning mechanism and a speed reduction transmission mechanism. The driving shaft is decelerated by multi-stage gear meshing and drives the cleaning brush to rotate, continuously cleaning the filter to prevent dust from clogging the filter and the silencer material layer, ensuring smooth airflow and silencer effect, and reducing maintenance frequency; at the same time, the filter can filter impurities in the airflow to protect the silencer material and internal components of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure proposed by the present invention; Figure 2 The present invention provides a schematic structural diagram of the muffler mechanism; Figure 3 The present invention provides a schematic structural diagram of a noise detection mechanism; Figure 4 The present invention provides a schematic structural diagram of a cleaning mechanism and a speed reduction transmission mechanism.

[0018] In the figure: 1. fan housing; 2. motor; 3. blades; 4. motor frame; 5. drive shaft; 6. muffler housing; 7. muffler mechanism; 71. annular fixing plate; 72. muffler bed; 721. bed body; 722. bed cover; 723. threaded ring; 724. through hole; 73. muffler material layer; 74. air guide cover; 8. noise detection mechanism; 81. fixing rod; 82. piston cylinder; 83. sound pressure piston; 84. piston rod; 85. spring; 86. air flow baffle; 9. filter; 10. cleaning mechanism; 101. cleaning brush; 102. rotating shaft; 11. speed reduction transmission mechanism; 111. support rod; 112. box body; 113. first small gear; 114. transmission shaft; 115. first large gear; 116. second small gear; 117. second large gear; 12. bolt assembly; 13. protective net. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-4 , an ultra-low noise axial flow fan with a silencer, comprising a fan casing 1 and a motor 2 and blades 3 arranged inside the fan casing 1, a motor frame 4 is fixedly provided inside the fan casing 1, the motor 2 is fixedly arranged inside the motor frame 4, a drive shaft 5 is fixedly provided at the output end of the motor 2, and the blades 3 are fixedly mounted on the shaft wall of the drive shaft 5, a muffler casing 6 is fixedly provided on one side of the fan casing 1, the fan casing 1 and the muffler casing 6 are fixedly connected by a bolt assembly 12, a protective net 13 is fixedly provided on one side of the air inlet of the fan casing 1, a muffler mechanism 7 is provided inside the muffler casing 6, and noise detection mechanisms 8 are provided on the top inner wall of the muffler casing 6 and on both sides of the muffler mechanism 7; A filter screen 9 is fixedly provided inside the muffler housing 6 and on one side close to the fan housing 1 . A cleaning mechanism 10 is provided on one side of the filter screen 9 , and the cleaning mechanism 10 is connected to one end of the drive shaft 5 .

[0021] The silencer mechanism 7 includes an annular fixing plate 71 located inside the silencer housing 6, a silencer bed 72 is fixedly provided inside the annular fixing plate 71, the interior of the silencer bed 72 is filled with a silencer material layer 73, and an air guide cover 74 is fixedly provided on the side of the silencer bed 72 facing the fan housing 1, and the opened side of the air guide cover 74 is fixedly connected to the inner wall of the silencer housing 6; the silencer bed 72 includes a bed body 721 fixedly arranged inside the annular fixing plate 71, a bed cover 722 is provided on one side of the bed body 721, and the bed body 721 and the bed cover 722 are fixedly connected by the cooperation of a threaded ring 723 and a threaded groove, so that the bed body 721 and the bed cover 722 can be disassembled and assembled, which is convenient for replacing the silencer material layer 73, and the side walls of the bed body 721 and the side walls of the bed cover 722 are provided with through holes 724, and the silencer material layer 73 is located inside the bed body 721 and the bed cover 722.

[0022] The noise detection mechanism 8 includes two fixed rods 81 fixedly set on the top inner wall of the muffler housing 6, and the lower ends of the two fixed rods 81 are fixedly provided with the same piston cylinder 82, and a sound pressure piston 83 is slidably provided inside the piston cylinder 82 [the sound pressure piston 83 adopts a lightweight, low-friction piston structure. Although the sound pressure is small, by optimizing the mass, area and mechanical friction of the piston (such as using low-resistance guide rails and lightweight materials), the sound pressure fluctuations can be converted into observable lifting displacements]. The top of the sound pressure piston 83 is fixedly provided with a piston rod 84 extending to the outside of the muffler housing 6, and the rod wall of the piston rod 84 is sleeved with a spring 85, and the two ends of the spring 85 are respectively fixedly connected to the top of the sound pressure piston 83 and the top inner wall of the piston cylinder 82; the rod wall of the piston rod 84 is provided with scale lines, which makes it convenient for staff to observe the extended length of the two piston rods 84, and an airflow baffle 86 is fixed at the bottom opening of the piston cylinder 82, which can prevent the airflow from directly impacting the sound pressure piston 83 and only allow sound pressure fluctuations to be transmitted to the surface of the sound pressure piston 83.

[0023] The cleaning mechanism 10 includes a cleaning brush 101 located on one side of the filter 9, a rotating shaft 102 is fixedly provided at the middle of the cleaning brush 101, and a speed reduction transmission mechanism 11 is provided between the rotating shaft 102 and the drive shaft 5. The speed reduction transmission mechanism 11 includes a support rod 111 fixedly provided on the inner wall of the bottom of the fan casing 1, and a box body 112 is fixedly provided on the upper end of the support rod 111. One end of the drive shaft 5 extends to the interior of the box body 112 and is fixedly provided with a first pinion 113. A transmission shaft 114 is provided for horizontal rotation inside the box body 112, and a first large gear 115 is fixed to the shaft wall of the transmission shaft 114. The first pinion 113 and the first large gear 115 are meshed together. A second pinion 116 is fixed to the shaft wall of the transmission shaft 114. One end of the rotating shaft 102 extends to the interior of the box body 112 and is fixedly provided with a second large gear 117. The second pinion 116 is meshed with the second large gear 117.

[0024] In summary, when in use, after the motor 2 is started, the output end drives the drive shaft 5 to rotate, thereby driving the blades 3 fixed to the shaft wall of the drive shaft 5 to rotate at high speed. When the blades 3 rotate, they push the air to form a directional airflow, and the airflow enters from the air inlet of the fan housing 1. The protective net 13 at the air inlet can prevent external debris from entering the fan, thereby preventing the blades 3 from being damaged. One side of the fan casing 1 is fixedly connected to the muffler casing 6 by a bolt assembly 12, and the air flow enters the muffler casing 6 through the fan casing 1 for noise reduction treatment. The noise reduction mechanism 7 inside the muffler casing 6 is the core noise reduction component, wherein the annular fixing plate 71 stably fixes the noise reduction bed 72 in the noise reduction casing 6. The noise reduction bed 72 consists of a bed body 721 and a bed cover 722, and the two are detachably connected by the cooperation of a threaded ring 723 and a threaded groove, so as to facilitate the later replacement of the internal noise reduction material layer 73. The noise reduction material layer 73 is filled between the bed body 721 and the bed cover 722. The through holes 724 opened on the side walls of the bed body 721 and the bed cover 722 provide a channel for sound waves to enter the noise reduction material layer 73 so that the sound waves are absorbed by the material. The air guide cover 74 of the noise reduction bed 72 facing the side of the fan casing 1 is trumpet-shaped, and its open side is fixed to the inner wall of the muffler casing 6, which can guide the air flow to smoothly enter the noise reduction bed 72, thereby reducing the secondary noise caused by air flow turbulence. In order to monitor the sound-absorbing effect of the sound-absorbing material layer 73, a noise detection mechanism 8 is provided on the inner wall of the top of the muffler shell 6 and on both sides of the muffler mechanism 7. A fixing rod 81 suspends and fixes the piston cylinder 82. The sound pressure piston 83 inside the piston cylinder 82 can slide up and down under the action of sound pressure. The piston rod 84 at the top of the sound pressure piston 83 extends to the outside of the muffler shell 6. The scale lines on its rod wall can intuitively display the displacement changes. The airflow baffle 86 at the bottom opening of the piston cylinder 82 can prevent the airflow from directly impacting the sound pressure piston 83 and only allow sound pressure fluctuations to be transmitted to the surface of the sound pressure piston 83. A spring 85 is sleeved on the piston rod 84, and its two ends are respectively connected to the top of the sound pressure piston 83 and the inner wall of the top of the piston cylinder 82, which can assist the sound pressure piston 83 in resetting when the sound pressure changes. By comparing the displacement difference of the sound pressure pistons 83 on both sides of the muffler mechanism 7, the degree of loss of the sound-absorbing material layer 73 can be judged. In addition, a filter screen 9 is provided on one side of the muffler housing 6 near the fan housing 1, which is used to filter dust and impurities in the airflow to prevent them from clogging the pores of the sound-absorbing material layer 73. A cleaning mechanism 10 is provided on one side of the filter screen 9. One end of the drive shaft 5 drives the cleaning mechanism 10 to work through the speed reduction transmission mechanism 11. In the speed reduction transmission mechanism 11, the support rod 111 supports the box body 112, and the drive shaft 5 extends into the box body 112 and drives the first small gear 113 to rotate. The first small gear 113 is engaged with the first large gear 115 on the transmission shaft 114, so that the transmission shaft 114 rotates at a lower speed. The second small gear 116 on the transmission shaft 114 is engaged with the second large gear 117 on the rotating shaft 102, and drives the rotating shaft 102 to rotate after further speed reduction. The cleaning brush 101 on the rotating shaft 102 rotates accordingly to clean the surface of the filter screen 9 to ensure its filtering effect.

[0025] It should be noted that the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0026] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-low noise axial flow fan with a muffler, comprising a fan housing (1) and a motor (2) and blades (3) arranged inside the fan housing (1), wherein a motor frame (4) is fixedly provided inside the fan housing (1), the motor (2) is fixedly provided inside the motor frame (4), a drive shaft (5) is fixedly provided at the output end of the motor (2), and the blades (3) are fixedly mounted on the shaft wall of the drive shaft (5), characterized in that: A muffler housing (6) is fixedly provided on one side of the fan housing (1), a muffler mechanism (7) is provided inside the muffler housing (6), and noise detection mechanisms (8) are provided on the top inner wall of the muffler housing (6) and on both sides of the muffler mechanism (7); A filter screen (9) is fixedly provided inside the muffler housing (6) and on one side close to the fan housing (1). A cleaning mechanism (10) is provided on one side of the filter screen (9), and the cleaning mechanism (10) is connected to one end of the drive shaft (5).

2. The ultra-low noise axial flow fan with a muffler according to claim 1, characterized in that: The muffler mechanism (7) includes an annular fixing plate (71) located inside the muffler housing (6), a muffler bed (72) is fixedly provided inside the annular fixing plate (71), a muffler material layer (73) is filled inside the muffler bed (72), an air guide cover (74) is fixedly provided on the side of the muffler bed (72) facing the fan housing (1), and the open side of the air guide cover (74) is fixedly connected to the inner wall of the muffler housing (6).

3. The ultra-low noise axial flow fan with a muffler according to claim 2, characterized in that: The sound-absorbing bed (72) comprises a bed body (721) fixedly arranged inside the annular fixing plate (71); a bed cover (722) is provided on one side of the bed body (721); the bed body (721) and the bed cover (722) are fixedly connected by a threaded ring (723) and a threaded groove; through holes (724) are provided on the side walls of the bed body (721) and the side walls of the bed cover (722); and the sound-absorbing material layer (73) is located inside the bed body (721) and the bed cover (722).

4. The ultra-low noise axial flow fan with a muffler according to claim 1, characterized in that: The noise detection mechanism (8) includes two fixed rods (81) fixedly arranged on the top inner wall of the muffler housing (6), the lower ends of the two fixed rods (81) are fixedly provided with a same piston cylinder (82), the interior of the piston cylinder (82) is slidably provided with a sound pressure piston (83), the top of the sound pressure piston (83) is fixedly provided with a piston rod (84) extending to the outside of the muffler housing (6), the rod wall of the piston rod (84) is provided with a spring (85), and the two ends of the spring (85) are respectively fixedly connected to the top of the sound pressure piston (83) and the top inner wall of the piston cylinder (82).

5. The ultra-low noise axial flow fan with a muffler according to claim 4, characterized in that: The rod wall of the piston rod (84) is provided with scale lines, and an airflow baffle (86) is fixedly provided at the bottom opening of the piston cylinder (82).

6. The ultra-low noise axial flow fan with a muffler according to claim 1, characterized in that: The cleaning mechanism (10) comprises a cleaning brush (101) located on one side of the filter screen (9), a rotating shaft (102) is fixedly provided in the middle of the cleaning brush (101), and a speed reduction transmission mechanism (11) is provided between the rotating shaft (102) and the drive shaft (5).

7. The ultra-low noise axial flow fan with a muffler according to claim 6, characterized in that: The speed reduction transmission mechanism (11) includes a support rod (111) fixedly arranged on the bottom inner wall of the fan housing (1), a box body (112) fixedly provided on the upper end of the support rod (111), one end of the drive shaft (5) extends into the interior of the box body (112) and is fixedly provided with a first pinion (113), a transmission shaft (114) is provided in the interior of the box body (112) for horizontal rotation, a first large gear (115) is fixedly provided on the shaft wall of the transmission shaft (114), the first small gear (113) and the first large gear (115) are meshed, a second small gear (116) is fixedly provided on the shaft wall of the transmission shaft (114), one end of the rotating shaft (102) extends into the interior of the box body (112) and is fixedly provided with a second large gear (117), the second small gear (116) and the second large gear (117) are meshed.

8. The ultra-low noise axial flow fan with a muffler according to claim 1, characterized in that: The fan housing (1) and the muffler housing (6) are fixedly connected via a bolt assembly (12), and a protective net (13) is fixedly provided on one side of the air inlet of the fan housing (1).

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