Centrifugal fan with noise reduction function

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan with a noise reduction function. Comprising a centrifugal fan body and a motor arranged on one side of the centrifugal fan body, and further comprises a volute arranged on one side of the centrifugal fan body, and a noise reduction assembly is arranged in an air inlet of the volute; the noise reduction assembly comprises a sealing plate arranged in the volute and a noise reduction material arranged between the sealing plate and the inner wall of the volute. The noise reduction material is noise reduction cotton; a volute tongue of the volute is filled with the noise reduction material; and a plurality of reinforcing strips are arranged outside the volute. The centrifugal fan with the noise reduction function has the advantages of being good in noise reduction effect, long in service life, simple in structure, convenient to disassemble and assemble and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field especially, relates to a centrifugal fan with noise reduction function. BACKGROUND

[0002] Centrifugal fan is a kind of equipment using centrifugal force to realize gas delivery, is widely used in industrial, commercial and civilian fields.The core component of centrifugal fan is impeller, impeller is driven under the motor at high speed.When gas enters impeller from air inlet, the blade of impeller exerts centrifugal force to gas, and gas obtains kinetic energy and is thrown out along the radial direction of impeller.Gas is further accelerated in volute and is converted into pressure energy, and finally is discharged from air outlet.This process realizes the delivery and pressure of gas.The conventional centrifugal fan generally increases the sound-absorbing structure at air outlet, this method is only applicable to the case where overall wind speed is small, when wind speed is larger, noise is still very large, and the problem cannot be fundamentally solved.

[0003] Chinese patent CN217976645U discloses a centrifugal fan with noise reduction structure, comprising: centrifugal fan, motor and mounting seat, the side of the centrifugal fan is provided with a motor, the motor is installed on the mounting seat, the surface of the mounting seat is placed with a shell wrapped outside the motor, the inner wall of the shell is provided with sound-absorbing cotton, the surface of the shell is clamped with a buckle, the bottom of the buckle is movably connected with a rotating shaft, the two ends of the rotating shaft are movably connected on the mounting seat, the surface of the buckle is connected with a clamping plate, the surface of the clamping plate is sleeved with a connecting rope, one end of the connecting rope is connected with a connecting spring. The centrifugal fan with noise reduction structure realizes the sound-absorbing and noise reduction of the motor through the mutual cooperation between the centrifugal fan, the motor, the mounting seat, the shell, the sound-absorbing cotton, the buckle, the rotating shaft, the clamping plate, the connecting rope and the connecting spring.

[0004] But the sound-absorbing cotton of this technical scheme is installed beside the motor, and the vibration of the motor may cause the sound-absorbing cotton to fall off, so the noise reduction effect is poor, and only the motor can be noise-reduced, the high-speed wind after being pressurized by the impeller has the fastest wind speed at the volute tongue, and the noise at the volute tongue is the largest, so this technical scheme cannot fundamentally solve the noise problem. Utility model content

[0005] The utility model discloses a centrifugal fan with noise reduction function, which can effectively reduce the noise generated during the high-speed flow of airflow after being pressurized, fundamentally solve the problem of noise generated when airflow enters the fan, directly control the noise source during the operation of the fan, and has remarkable noise reduction effect.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The centrifugal fan with noise reduction function comprises a centrifugal fan body and a motor arranged at one side of the centrifugal fan body, and a volute is arranged at one side of the centrifugal fan body, and a noise reduction assembly is arranged at a volute tongue of the volute.

[0008] Preferably, the noise reduction assembly comprises a sealing plate arranged in the volute, a porous plate arranged at the opposite side of the sealing plate, and noise reduction material arranged between the sealing plate and the porous plate.

[0009] Preferably, the noise reduction material is sound-absorbing cotton.

[0010] Preferably, the noise reduction material is filled at the volute tongue of the volute.

[0011] Preferably, the volute is externally provided with a plurality of reinforcing strips.

[0012] Preferably, the volute and the motor are fixedly connected through a plurality of fasteners.

[0013] Preferably, the air inlet of the volute is horizontally arranged, and the air inlet is arranged at the opposite side of the motor.

[0014] Preferably, the air outlet of the volute is vertically arranged upwards.

[0015] The centrifugal fan with noise reduction function has the advantages that:

[0016] (1) The noise reduction assembly is arranged at the volute tongue, and the heat dissipation of the motor is not directly affected, the heat dissipation condition of the motor can be kept good, the stable operation of the motor is facilitated, the noise reduction assembly can effectively absorb and weaken the noise, the airflow entering the volute is more stable, the additional noise caused by airflow turbulence is reduced, the noise level during the operation of the whole fan is reduced, the comfort of the working environment is improved, and the centrifugal fan is especially suitable for places with high noise requirements.

[0017] (2) The sound-absorbing cotton is filled at the volute tongue of the volute to ensure the noise reduction effect at the air inlet, because the sound-absorbing cotton has a porous structure, when the airflow passes through, the sound waves will enter the pores, and continuously reflect, refract and interfere with each other in the pores, so as to convert the sound energy into heat energy and other forms of energy and be consumed, so as to achieve the purpose of reducing noise; and the sound-absorbing cotton has the characteristics of small density, high sound absorption coefficient, wide sound absorption frequency band, etc., and has good absorption effect on different frequency noises, including low-frequency booming sound, medium-frequency noisy sound and high-frequency sharp sound, etc., effectively reducing various noises generated during the operation of the fan, and improving the noise reduction effect.

[0018] (3) The utility model discloses a set up a plurality of reinforcing strips on the outside of volute can prevent the deformation, cracking and other problems of volute in the long -term operation process, prolong the service life of volute, guarantee the normal operation of fan, because centrifugal fan in the operation process, volute will be subjected to the pressure and vibration of airflow and other acting force, set up reinforcing strip can enhance the structural strength and rigidity of volute, make it can better bear these acting force.

[0019] In conclusion, the utility model has the advantages of good noise reduction effect, long service life, simple structure and convenient dismounting. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of the utility model;

[0021] Figure 2 It is the A place enlarged view of Figure 1

[0022] Figure 3 It is the flow direction schematic diagram of the utility model air intake and air outlet. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts belong to the range of protection of the utility model.

[0024] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientation or position relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] EMBODIMENT ​

[0026] As shown in Figures 1-3 The embodiment provides a centrifugal fan with noise reduction function, which comprises a centrifugal fan body 1 and a motor 2 arranged on one side of the centrifugal fan body 1, and further comprises a volute 3 arranged on one side of the centrifugal fan body 1, wherein a noise reduction assembly 4 is arranged at the volute tongue of the volute 3. When the centrifugal fan is running, air entering from the air inlet will generate airflow impact noise. The noise reduction assembly 4 arranged in the air inlet can effectively absorb and weaken the noise, so that the airflow entering the volute 3 is more stable, the additional noise generated by airflow turbulence is reduced, the noise level of the whole fan during running is reduced, the comfort of the working environment is improved, and the centrifugal fan is especially suitable for places with high noise requirements, such as hospitals, schools, office buildings and the like. The volute tongue is the place with the largest wind speed of the centrifugal fan, and the noise generated here is also the largest. The noise reduction assembly 4 installed at the volute tongue fundamentally solves the problem of noise, and the noise reduction effect is excellent.

[0027] The noise reduction assembly 4 comprises a sealing plate 41 arranged inside the volute 3, a porous plate 43 arranged on the opposite side of the sealing plate 41, and a noise reduction material 42 arranged between the sealing plate 41 and the porous plate 43. The sealing plate 41 can fix the noise reduction material 42, prevent the noise reduction material 42 from being displaced or falling off due to airflow impact during the running of the fan, and ensure that the noise reduction material 42 can stably play a role. The sealing plate 41 can also guide the airflow to some extent, so that the airflow passes through the noise reduction material 42 more smoothly, and the noise reduction effect is improved. The sealing plate 41 and the porous plate 43 are both porous structures, which further ensure the noise reduction effect.

[0028] Meanwhile, the noise reduction material 42 is sound-absorbing cotton. The sound-absorbing cotton has a porous structure. When the airflow passes through, the sound waves will enter these pores and continuously reflect, refract and interfere with each other in the pores, so as to convert the sound energy into heat energy or other forms of energy and be consumed, thereby achieving the purpose of reducing noise. The sound-absorbing cotton has the characteristics of small density, high sound absorption coefficient and wide sound absorption frequency band, and can have good absorption effect on noise of different frequencies, including low-frequency booming sound, medium-frequency noisy sound and high-frequency sharp sound, etc. The sound-absorbing cotton can effectively reduce various noises generated during the running of the fan and improve the noise reduction effect.

[0029] In the embodiment, the noise reduction material 42 is filled at the volute tongue of the volute 3. The volute tongue of the volute 3 is a place where the airflow direction changes sharply, and vortex and airflow separation phenomena are easy to occur, thereby generating relatively large noise. Specifically, after the overall airflow passes through the centrifugal force of the impeller, the gap between the impeller and the sealing plate 41 is the smallest, and noise will be generated at this time. The noise reduction material 42 filled at the volute tongue can effectively absorb and weaken the noise generated by vortex and airflow separation, further reduce the noise level of the whole fan, and make the noise reduction effect more comprehensive and significant.

[0030] In the embodiment, the filled noise reduction material 42 can also play a certain rectifying role for the airflow at the volute tongue, so that the airflow passes through the volute 3 more smoothly, reduces the resistance and energy loss of the airflow, and improves the operation efficiency of the fan.

[0031] In the embodiment, the volute 3 is externally provided with a plurality of reinforcing strips 31. During the operation of the centrifugal fan, the volute 3 is subjected to forces such as pressure and vibration of the airflow. The reinforcing strips 31 can enhance the structural strength and rigidity of the volute 3, so that the volute 3 can better withstand these forces, prevent deformation and cracking of the volute 3 during long-term operation, prolong the service life of the volute 3, and ensure normal operation of the fan.

[0032] In the embodiment, the reinforcing strips 31 can also play a certain damping role, can absorb and disperse the vibration energy of the volute 3, reduce the propagation of vibration, thereby reducing the noise generated by vibration, and further improving the noise reduction effect of the fan.

[0033] In the embodiment, the volute 3 and the motor 2 are fixedly connected through a plurality of fasteners 32, so that the two will not be loose or displaced during operation, so that the overall structure of the fan is more stable and firm, and the fasteners 32 are preferably bolts, which are convenient to disassemble and assemble.

[0034] Of course, the air inlet of the volute 3 is in a horizontal direction, and the air inlet is arranged at the opposite side of the motor 2, so that the airflow enters the volute 3 from the side away from the motor 2, avoids direct impact of the airflow on the motor 2, reduces the interference and heat transfer generated by the airflow on the motor 2, is conducive to heat dissipation and stable operation of the motor 2, and the horizontal air inlet can make the airflow more uniformly enter the volute 3, reduce the deflection and vortex of the airflow, and improve the air inlet efficiency and operation stability of the fan.

[0035] In addition, the air outlet of the volute 3 is vertically upward, so that the airflow can be discharged along a specific direction after leaving the volute 3, and the discharged airflow can be guided to a required place, such as upward air discharge, which can avoid direct blowing of the airflow to the ground or surrounding equipment, reduce the influence on the surrounding environment, and also facilitate butt joint with other air discharge pipelines or equipment; and the vertically upward air outlet can reduce the collision and friction of the airflow with surrounding objects during discharge, thereby reducing the secondary noise generated by the impact of the airflow, and further improving the noise reduction effect of the fan.

[0036] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A centrifugal fan with noise reduction function, comprising: The centrifugal fan body and the motor arranged on one side of the centrifugal fan body, characterized by comprising a volute arranged on one side of the centrifugal fan body, and a noise reduction assembly arranged at a volute tongue of the volute. The noise reduction assembly comprises a sealing plate arranged inside the volute, a porous plate arranged on the opposite side of the sealing plate, and a noise reduction material arranged between the sealing plate and the porous plate.

2. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The noise reduction material is filled at the volute tongue of the volute.

3. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The noise reduction material is sound-absorbing cotton.

4. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The volute is externally provided with a plurality of reinforcing strips.

5. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The volute and the motor are fixedly connected through a plurality of fasteners.

6. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The air inlet of the volute is in a horizontal direction.

7. The centrifugal fan with noise reduction function according to claim 1, characterized in that, The air outlet of the volute is vertically upwardly arranged.

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