CN114352574B - Centrifugal fan with vortex-proof sheet - Google Patents
Centrifugal fan with vortex-proof sheet Download PDFInfo
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- CN114352574B CN114352574B CN202210002544.6A CN202210002544A CN114352574B CN 114352574 B CN114352574 B CN 114352574B CN 202210002544 A CN202210002544 A CN 202210002544A CN 114352574 B CN114352574 B CN 114352574B
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Abstract
The utility model discloses a centrifugal fan with a vortex-preventing sheet, which comprises a volute, a driving device and an impeller, wherein the driving device is respectively connected with the volute and the impeller, the volute comprises a body, an air outlet and a volute tongue, the air outlet and the volute tongue are fixedly connected with the body, the impeller is positioned in the volute, the volute is fixedly connected with the vortex-preventing sheet, the vortex-preventing sheet extends towards the air outlet, and the distance between the vortex-preventing sheet and the rotation center of the impeller is D 2 ＝a 1 *D 1 Wherein the coefficient a 1 1.05 to 1.4, D 1 Is the maximum outer diameter of the impeller. The utility model has the beneficial effects that: the vortex sheet is used for diverting air in advance, so that backflow at the volute tongue is effectively reduced, the vortex structure at the air outlet is obviously improved, vibration and noise generated by unstable air flow at the volute tongue can be weakened, the effect of improving the air exhaust volume of the centrifugal fan is achieved, the effect of improving the working performance of the fan is also achieved, and the centrifugal fan has the advantages of low noise decibel value, stable air outlet and compact structure.
Description
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan with a vortex-preventing sheet.
Background
The centrifugal fan is widely used for refrigerating air-conditioning, household purifier and other equipment, and can play roles in air supply, dust discharge, heat dissipation, cooling and the like, and the use environment of the centrifugal fan comprises and is not limited to the facilities and equipment. The centrifugal fan comprises a volute component, a motor component and an impeller component, wherein the motor component drives the impeller component to rotate in the volute component, so that the function of air supply is realized. In order to make the structure of the centrifugal fan more compact, the thickness of the centrifugal fan needs to be reduced, so that the ratio of the thickness to the diameter of the centrifugal fan is not in the recommended value range of the centrifugal fan design, the area ratio of the effective acting area of the blade is reduced, the flow field in the volute of the fan is disordered, obvious unstable air flow is easy to appear, and the noise reduction effect and the working performance of the centrifugal fan are reduced. Especially in ultra-thin design, two air-out designs and the unusual design scheme that the point of use flow deviates from the highest efficiency point of fan for the inside air current flow control degree of difficulty of fan is very big, how to control the air current flow in the centrifugal fan of unusual design becomes the technical difficulty that improves fan performance and reduce fan noise.
The publication number CN202194839U discloses a small double-air-outlet centrifugal fan, which comprises a motor, an impeller connected to an output shaft of the motor, a volute, wherein the impeller is arranged in the volute, the motor is arranged outside the volute, and the output shaft of the motor extends into the volute; two air outlets are oppositely arranged on the volute, and the air outlets are close to the rim of the impeller. In the design process of the centrifugal fan, the design of the double air outlet places has two outlets, the parameters of the two worm wheel outlets can be mutually influenced, the parameters are remained in each section of volute to be insufficiently diffused, and the design difficulty of optimizing the parameters of the volute is high. In addition, in order to make the size of the fan as compact as possible, the wind resistance of the wind path inside the whole centrifugal fan is larger, the static pressure of the fan is higher, at the moment, the backflow at the fan volute tongue is obviously increased, the She Daona airflow is separated greatly, the surge phenomenon, the periodical flow repeated fluctuation, the violent fan shake and obvious air outlet unsmooth phenomenon are easy to occur, and the noise reduction effect and the working performance of the centrifugal fan are adversely affected.
The Chinese patent with publication number of CN212690391U discloses a centrifugal fan and a range hood, and relates to the technical field of kitchen appliances, wherein the centrifugal fan comprises a volute and a guide plate; the volute is provided with a cavity and an air outlet communicated with the cavity, and the cavity comprises an impeller cavity and a flow guide cavity connected with the impeller cavity and the air outlet; an impeller assembly is arranged in the impeller cavity, and the plane of the air outlet is parallel to the circumferential plane of the impeller in the impeller assembly; the guide plate is arranged in the guide cavity, the guide plate bends from the outlet of the impeller cavity to the direction of the air outlet, and the guide plate divides the guide cavity into a plurality of cavities; the range hood comprises the centrifugal fan. Through the setting of guide plate can exert the effect that reduces vortex, noise reduction in the corner of air outlet, but still be difficult to solve the problem that fan volute tongue department backward flow obviously increases when fan size design is compact.
Therefore, the centrifugal fan in the prior art has the problems of high noise decibel value, unstable air outlet and non-compact structure.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide a centrifugal fan with a vortex-preventing sheet, which comprises a volute, a driving device and an impeller.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a centrifugal fan with prevent vortex sheet, includes spiral case, drive arrangement and impeller, drive arrangement is connected with spiral case and impeller respectively, the spiral case includes body, air outlet and volute tongue all with body fixed connection, the impeller is located the spiral case, spiral case fixedly connected with prevents vortex sheet, prevent vortex sheet to the air outlet extension, prevent vortex sheet and impeller center of rotation's distance be D 2 ＝a 1 *D 1 Wherein the coefficient a 1 1.05 to 1.4, D 1 Is the maximum outer diameter of the impeller. By such arrangement: the air is divided in advance through the vortex-preventing sheet, one part of the divided air flows to the air outlet after directly passing through the vortex-preventing sheet, and the other part flows to the air outlet after passing through the volute tongue, so that the backflow of the volute tongue is effectively reduced, the circulation capacity of the air outlet is improved, the vortex structure at the air outlet is obviously improved, the vibration and noise generated by unstable airflow at the volute tongue can be weakened, the flow of the airflow is smoother, the effect of improving the air exhaust volume of the centrifugal fan is achieved, the effect of improving the working performance of the fan is also achieved, and the centrifugal fan has the advantages of low noise decibel value, stable air outlet and compact structure.
Preferably, the vortex-preventing sheet is provided with a diversion hole. By such arrangement: the performance of the centrifugal fan for outputting the air quantity is improved, the effect of noise control is achieved, and the advantages of good noise reduction effect, good air outlet stability and large air quantity output are achieved.
Preferably, the side wall contour line of the body is a spiral line, the side wall contour line of the air outlet is a straight line, the contour line of the volute tongue is arc-shaped, two side walls of the air outlet are respectively tangent with the volute tongue and the side wall of the body, and the volute tongue is tangent with the side wall of the body. By such arrangement: vibration and noise generated by unstable air flow at the volute tongue can be weakened, and the effect of improving the working performance of the fan can be achieved.
Preferably, the distance b from the intersection position of the surface of the vortex-preventing sheet and the air outlet to one side wall of the air outlet 2 ＝a 3 *b 1 Wherein the coefficient a 3 0.2 to 0.8, b 1 Is the width of the air outlet. By such arrangement: the gas on two sides of the vortex-preventing piece can be smoothly discharged after being split by the vortex-preventing piece, and the noise reduction effect and the working performance are guaranteed.
Preferably, the distance between the end of the vortex-preventing piece close to the impeller and the volute tongue is C 1 ＝a4*b 1 Wherein the coefficient a4 is 0.2 to 0.8, b 1 For the width of the air outlet, one side of the vortex-preventing piece far away from the volute tongue is provided with an arc-shaped surface, and the radius R of the arc-shaped surface 3 ＝a 2 *D 1 Wherein the coefficient a 2 1.2 to 2. By such arrangement: the flow of the air flow is smoother, the wind resistance in the volute is reduced, and the effect of improving the working performance of the centrifugal fan is achieved.
Preferably, the circle center of the spiral contour line of the side wall of the body is positioned on the rotation axis of the impeller, and the distance relation between the spiral contour line of the side wall of the body and the circle center accords with the equation:wherein r is the maximum excircle radius of the impeller, t is the gap width between the volute tongue and the impeller, alpha is the helix angle, < >>Is the azimuth angle of the spiral line with the rotation center of the impeller as the center,the azimuth angle of the volute tongue tangential to the spiral line is R, and the radial coordinate of the spiral contour line is R. By such arrangement: optimize the structure of body lateral wall, make the gas flow in the spiral case smoother, play the effect that improves fan performance and noise reduction.
Preferably, the driving device comprises a rotor shell, a permanent magnet, a stator shell and a stator coil, wherein the permanent magnet is fixedly connected with the inner wall of the rotor shell, the rotor shell is fixedly connected with an impeller, the stator coil is fixedly connected with the stator shell, the rotor shell is fixedly installed in a volute, the stator coil is located in the rotor shell, and the impeller is fixedly connected with a rotating shaft which is rotationally connected with the volute. By such arrangement: the function of driving the impeller to rotate in the volute is realized through the driving device.
Preferably, the volute further comprises a base, the base comprises an arc-shaped plate, a mounting platform and reinforcing ribs, the arc-shaped plate is fixedly connected with the body and the mounting platform respectively, the reinforcing ribs are fixedly connected with the arc-shaped plate and the mounting platform respectively, and the driving device is connected with the mounting platform. By such arrangement: the noise generated during the working of the centrifugal fan is reduced, and the advantage of lower noise decibel value is achieved.
Preferably, 2 air outlets and the volute tongues are arranged, the 2 volute tongues and the 2 air outlets are in one-to-one correspondence, and the azimuth angle difference delta phi 2 of the 2 volute tongues is 160-200 degrees. By such arrangement: the phenomenon that the mutual influence of volute parameters at the two volute tongues is overlarge due to the fact that the two volute tongues are too close is avoided, and the effect of ensuring the noise reduction effect and the working performance of the fan is achieved.
Preferably, 2 vortex-preventing sheets are arranged, and the 2 vortex-preventing sheets are respectively in one-to-one correspondence with the 2 volute tongues. By such arrangement: the centrifugal fan outlet flow field structure designed by the double air outlets is improved, the effects of reducing noise and improving noise quality are achieved, and the centrifugal fan is particularly suitable for centrifugal fans designed by the double air outlets.
Compared with the prior art, the utility model has the beneficial technical effects that:
1. the air is split in advance through the vortex-preventing sheet, one part of the split air directly flows to the air outlet after passing through the vortex-preventing sheet, and the other part flows to the air outlet after passing through the volute tongue, so that the backflow of the volute tongue is effectively reduced, the circulation capacity of the air outlet is improved, the vortex structure at the air outlet is obviously improved, vibration and noise generated by unstable airflow at the volute tongue can be weakened, the flow of the airflow is smoother, the effect of improving the air exhaust volume of the centrifugal fan is achieved, and the effect of improving the working performance of the fan is also achieved.
2. Through the setting of guide vane, can be when centrifugal fan thickness is less, wind path windage is great, prevent the air current transition and deflect the volute tongue to can effectively reduce the backward flow that volute tongue department produced, make centrifugal fan can be better be applicable to the operating mode of low discharge high static pressure, guaranteed centrifugal fan's noise reduction effect and working property, thereby can reduce centrifugal fan's thickness when guaranteeing noise reduction effect and working property, make centrifugal fan structure compacter. Has the advantages of low noise decibel value, stable air outlet and compact structure.
3. The volute tongue is a region with a more chaotic flow field in the volute, the flow can be split through the arrangement of the vortex-preventing piece, airflow is led to flow to the air outlet, air pressure pulsation and speed pulsation at the volute tongue are reduced, the working noise of the fan is reduced, the noise quality is improved, and backflow generated at the volute tongue can be reduced, so that the performance of the fan is improved, air in the volute tongue flows more smoothly, and the sound quality of the centrifugal fan during working is improved.
4. The distance between the vortex-preventing piece and the rotation center of the impeller is not less than 1.05 times of the maximum outer diameter of the impeller, so that abnormal sounds such as whistle caused by air flow between the vortex-preventing piece and the impeller due to the fact that the vortex-preventing piece is too close to the impeller are prevented, and the effect of ensuring the noise reduction effect of the centrifugal fan is achieved.
5. The distance between the vortex-preventing piece and the impeller rotation center is set to be not higher than 1.4 times of the maximum outer diameter of the impeller, so that the vortex-preventing piece and the impeller are prevented from being too far, the vortex-preventing piece is prevented from losing the effect of providing flow division for the volute tongue, and the effects of guaranteeing the noise reduction effect and the air outlet stability of the centrifugal fan are achieved.
6. Through the setting of vortex-proof piece, increased a mode that influences and control the air current in the spiral case, effectively improved the structure of air outlet flow field. The one end that the vortex sheet is close to the air outlet is to keeping away from the direction slope of volute tongue, makes the air current of volute tongue department have sufficient space to discharge through the air outlet, reduces the air current of volute tongue department and makes the windage that receives through the air outlet, makes the air current of volute tongue department discharge more smoothly, when improving fan working property, can also weaken the backward flow that the volute tongue department produced to vibration and the noise that unstable air current of volute tongue department produced can be weakened.
Drawings
FIG. 1 is a schematic view showing a centrifugal fan with a vortex sheet according to embodiment 1 of the present utility model;
fig. 2 is a schematic view showing the structure of a scroll casing, a driving device and an impeller in embodiment 1 of the present utility model;
FIG. 3 is a schematic diagram of the structure of the air outlet, the volute tongue and the vortex sheet in embodiment 1 of the present utility model;
FIG. 4 is a graph showing the P-Q curve and the rotation speed curve of the centrifugal fan provided with the vortex sheet and the centrifugal fan without the vortex sheet in the embodiment 1 of the present utility model;
FIG. 5 is a schematic diagram of the structure of the air outlet, volute tongue and vortex sheet in embodiment 2 of the present utility model;
FIG. 6 is a schematic diagram of the structure of the air outlet and vortex plate in embodiment 3 of the present utility model;
fig. 7 is a schematic diagram of the structure of the air outlet and the vortex-preventing sheet in embodiment 4 of the present utility model.
Wherein, the technical characteristics that each reference sign indicates are as follows:
10. a volute; 11. a body; 12. an air outlet; 13. a volute tongue; 14. an air inlet; 15. an arc-shaped plate; 16. a mounting platform; 17. reinforcing ribs; 20. a driving device; 21. a rotor housing; 22. a permanent magnet; 23. a stator housing; 24. a stator coil; 25. a rotating shaft; 30. an impeller; 40. vortex-proof sheet; 41. a diversion aperture; 42. an arc surface; 43. a spacer.
Detailed Description
The present utility model will be further described in detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, but the scope of the present utility model is not limited to the following specific examples.
Example 1:
referring to fig. 1-3, a centrifugal fan with a vortex sheet includes a volute 10, a driving device 20, and an impeller 30. The body 11 is provided with an air inlet 14, the driving device 20 drives the impeller 30 to rotate in the volute 10, and air is driven to enter the body 11 from the air inlet 14 through the rotating impeller 30 and is discharged through the air outlet 12, so that the air supply function of the centrifugal fan is realized.
The driving device 20 is respectively connected with the volute 10 and the impeller 30, the volute 10 comprises a body 11, an air outlet 12 and a volute tongue 13, the air outlet 12 and the volute tongue 13 are fixedly connected with the body 11, the impeller 30 is positioned in the volute 10, the volute 10 is fixedly connected with a vortex-preventing sheet 40, the vortex-preventing sheet 40 extends towards the air outlet 12, and the distance between the vortex-preventing sheet 40 and the rotation center of the impeller 30 is D 2 ＝a 1 *D 1 Wherein the coefficient a 1 1.05 to 1.4, in this example a 1 1.16, D 1 Is the maximum outer diameter of the impeller 30. The number of air outlets 12 and the number of volute tongues 13 are 2, the number of 2 volute tongues 13 corresponds to the number of 2 air outlets 12 one by one, the azimuth angle difference delta phi 2 of the 2 volute tongues 13 with the rotation center of the impeller 30 as the center is 160-200 degrees, and in the embodiment, the number of 2 air outlets 12 is symmetrically arranged.
The side wall contour line of the body 11 is spiral line, the side wall contour line of the air outlet 12 is straight line, the contour line of the volute tongue 13 is arc-shaped, two side walls of the air outlet 12 are tangent with the volute tongue 13 and the side wall of the body 11 respectively, and the volute tongue 13 is tangent with the side wall of the body 11. The circle center of the spiral contour line of the side wall of the body 11 is positioned on the rotation axis of the impeller 30, and the distance relation between the spiral contour line of the side wall of the body 11 and the circle center accords with the equation:wherein r is the maximum outer circle radius of the impeller 30, t is the gap width between the volute tongue 13 and the impeller 30, alpha is the helix angle, < >>Azimuth angle of spiral line with rotation center of impeller 30 as center, < ->For tongues 13 tangential to the helixThe azimuth angle, R, is the radial coordinate of the spiral profile, i.e. the distance from the centre of the circle to the side wall of the body 11. Optimize the structure of body 11 lateral wall, make the gas flow in the spiral case smoother, play the effect that improves fan performance and noise reduction.
One end of the vortex plate 40, which is far away from the impeller 30, extends to the air outlet 12, so that the vortex plate 40 is ensured to have enough length to play a role in diversion, and the vortex plate 40 is prevented from being invalid due to too short length. The distance b between one end of the vortex-preventing sheet 40 close to the air outlet 12 and one side wall of the air outlet 12 2 ＝a 3 *b 1 Wherein the coefficient a 3 0.2 to 0.8, b 1 Which is the width of the air outlet 12. The end of the vortex plate 40 near the impeller 30 is spaced from the volute tongue 13 by a distance C 1 ＝a4*b 1 Wherein the coefficient a4 is 0.2 to 0.8, b 1 Which is the width of the air outlet 12. The side of the vortex-preventing piece 40 far away from the volute tongue 13 is provided with an arc-shaped surface 42, and the radius R of the arc-shaped surface 42 3 ＝a 2 *D 1 Wherein the coefficient a 2 1.2 to 2.
The volute 10 further comprises a base, the base comprises an arc-shaped plate 15, a mounting platform 16 and reinforcing ribs 17, the arc-shaped plate 15 is fixedly connected with the body 11 and the mounting platform 16 respectively, the reinforcing ribs 17 are fixedly connected with the arc-shaped plate 15 and the mounting platform 16 respectively, and the driving device 20 is connected with the mounting platform 16. The driving device 20 comprises a rotor shell 21, a permanent magnet 22, a stator shell 23 and a stator coil 24, wherein the permanent magnet 22 is fixedly connected with the inner wall of the rotor shell 21, the rotor shell 21 is fixedly connected with an impeller 30, the stator coil 24 is fixedly connected with the stator shell 23, the rotor shell 21 is fixedly installed in the volute 10, the stator coil 24 is positioned in the rotor shell 21, the impeller 30 is fixedly connected with a rotating shaft 25 which is rotationally connected with the volute 10, and the rotating shaft 25 is rotationally connected with the mounting platform 16. The stator housing 23 is fixedly connected with the mounting platform 16, and the stator housing 23, the mounting platform 16, the reinforcing ribs 17, the arc plate 15 and the body 11 are connected in an injection molding integrated molding or ultrasonic welding mode. In the present embodiment, the stator housing 23, the mounting platform 16, the reinforcing ribs 17, the arc plate 15 and the body 11 are connected through an ultrasonic welding process, so that the rotor housing 21 and the impeller 30 can be fixed and then the shaft 25, the rotor housing 21 and the impeller 30 can be simultaneously mounted on the mounting platform 16, and the driving device 20 can be very conveniently mounted on the mounting platform 16.
Referring to fig. 4, the P-Q curve and the rotation speed curve obtained by comparing the centrifugal fan provided with the vortex sheet 40 and the centrifugal fan not provided with the vortex sheet 40 in this embodiment under the same environmental conditions are shown in table 1, and the working point test data are shown in the following table 1:
table 1 shows the working point test data table of the centrifugal fan provided with the vortex sheet and the centrifugal fan without the vortex sheet
After the centrifugal fan is provided with the vortex-preventing sheet 40, the noise of the whole machine is reduced, the air quantity is increased to some extent, the surge sound is eliminated, and the noise tone quality of the fan is improved, so that the effect of simultaneously reducing the working noise and the working performance of the fan can be achieved.
This embodiment has the following advantages:
in the rotation process of the impeller 30, air flows in the volute 10 and flows back at the volute tongue 13, so that the surge phenomenon and periodic flow are easy to occur, the phenomenon of unsmooth air outlet occurs due to shaking of the fan, and particularly in a centrifugal fan with a thinner thickness, because the area ratio of the effective acting area of the blade is smaller, the flow field in the volute 10 of the fan is chaotic and more eddies have more unstable air flow, and the working performance of the fan is reduced and the noise is increased. In this application, the centrifugal fan passes through the setting of vortex-preventing piece 40, impeller 30 drive air is in the in-process of flowing in spiral case 10, the air current flows along the direction from vortex-preventing piece 40 to volute tongue 13, the air current is before flowing to volute tongue 13, earlier through vortex-preventing piece 40 to the air flow in advance, the air after being shunted partly flows to air outlet 12 after directly passing through vortex-preventing piece 40, the flow of air outlet 12 is again flowed after the other part flows through volute tongue 13, thereby effectively reduced the backward flow of volute tongue 13 department, and promoted the circulation capacity of air outlet 12, make the vortex structure of air outlet 12 department obviously improve, can weaken vibration and noise that unstable air current produced in volute tongue 13 department, and make the flow of air current more smooth and easy, prevent surging phenomenon, periodic flow repeatedly undulant, fan shake violent and obvious play the phenomenon appearance of air-out unsmooth, reach the effect of promoting centrifugal fan's amount of wind, also can play the effect of improving fan working property.
And when the working condition of small flow and high static pressure is adopted, the actual flow of the fan is smaller than the flow when the fan is at the rated working point, namely the actual flow of the fan is smaller than the flow when the fan is at the highest efficiency point. The rated working point flow of the centrifugal fan in the application is set to be 1, the maximum flow is about 2.4 times of rated flow, and the actual working point is 0.44 times of rated flow in the use process, so that the centrifugal fan is in a working condition of small flow and high static pressure in the actual use process, the rotating speed of the impeller 30 is 2400r/min, and the air quantity is 40 cubic meters per hour. The maximum air volume at the efficiency point is 93 cubic meters per hour. The maximum output air quantity of the centrifugal fan is 178 cubic meters per hour.
When the working condition of small flow and high static pressure is adopted, the wind resistance of the wind path in the volute 10 is larger, the actual working point of the fan is always in the working condition of small flow and high static pressure, namely, the actual flow of the fan is smaller than the working condition of the fan in the rated working point, at the moment, the airflow direction at the air outlet 12 is close to the volute tongue 13 due to the smaller flow, so that the backflow at the volute tongue 13 is obviously increased, and the surge phenomenon is easy to occur. Through the setting of guide vane, can be when centrifugal fan thickness is less, wind path windage is great, prevent the air current transition and deflect volute tongue 13 to can effectively reduce the backward flow that volute tongue 13 department produced, prevent the appearance of surging the phenomenon, make centrifugal fan can be better be applicable to the operating mode of low discharge high static pressure, guaranteed centrifugal fan's noise reduction effect and working property, thereby can reduce centrifugal fan's thickness when guaranteeing noise reduction effect and working property, make centrifugal fan structure compacter. Has the advantages of low noise decibel value, stable air outlet and compact structure.
The volute tongue 13 is a region with a more chaotic flow field in the volute 10, and through the arrangement of the vortex-preventing piece 40, the flow of air flow to the air outlet 12 is guided, air pressure pulsation and speed pulsation at the volute tongue 13 are reduced, the fan working noise is reduced, the noise quality is improved, and backflow generated at the volute tongue 13 can be reduced, so that the fan performance is improved, the air flow in the volute tongue 13 is smoother, and the sound quality of the centrifugal fan during working is improved.
The distance between the vortex-preventing piece 40 and the rotation center of the impeller 30 is set to be not less than 1.05 times of the maximum outer diameter of the impeller 30, so that abnormal sounds such as whistle and the like caused by air flow between the vortex-preventing piece 40 and the impeller 30 due to the fact that the vortex-preventing piece 40 is too close to the impeller 30 are prevented, and the effect of ensuring the noise reduction effect of the centrifugal fan is achieved.
The distance between the vortex-preventing piece 40 and the rotation center of the impeller 30 is set to be not higher than 1.4 times of the maximum outer diameter of the impeller 30, so that the vortex-preventing piece 40 is prevented from losing the effect of providing the diversion for the volute tongue 13 due to the fact that the vortex-preventing piece 40 is too far away from the impeller 30, and the effects of guaranteeing the noise reduction effect and the air outlet stability of the centrifugal fan are achieved.
The vortex sheet 40 is inclined towards the direction far away from the volute tongue 13 at one end close to the air outlet 12, and the flowing air flow is further split to the air outlet 12, so that the backflow generated at the volute tongue 13 is further reduced, the vibration and noise generated by unstable air flow at the volute tongue 13 can be weakened, the air flow can flow more smoothly, the effect of improving the air exhaust volume of the centrifugal fan is achieved, and the effect of improving the working performance of the fan can be also achieved.
The thickness of the vortex-preventing sheet 40 along the end close to the air outlet 12 is greater than the thickness of the end far away from the air outlet 12, so that the structural strength of the vortex-preventing sheet 40 is improved, and the smooth flow of air flows at two sides of the vortex-preventing sheet 40 is ensured. The vortex sheet 40 is prevented from vibrating to generate noise and from flowing back to cause surge, thereby ensuring the noise reduction effect.
Through the arrangement of the vortex-preventing sheet 40, a mode of influencing and controlling the airflow in the volute 10 is added in the ultra-thin design of the centrifugal fan, the double-air-outlet design and the unconventional design scheme that the flow rate of the using point deviates from the highest efficiency point of the fan, so that the structure of the flow field of the air outlet 12 is effectively improved. The end of the vortex-preventing piece 40, which is close to the air outlet 12, is inclined in a direction away from the volute tongue 13, so that enough space is reserved for air flow at the volute tongue 13 to be discharged through the air outlet 12, the wind resistance of the air flow at the volute tongue 13, which is caused by the air flow at the air outlet 12, is reduced, the air flow at the volute tongue 13 can be discharged more smoothly, the working performance of the fan is improved, and meanwhile, the backflow generated at the volute tongue 13 can be weakened, so that vibration and noise generated by unstable air flow at the volute tongue 13 can be weakened.
The volute tongue 13 is tangent to the side wall of the air outlet 12 and the side wall of the body 11 respectively, so that air at the volute tongue 13 can flow more smoothly, backflow at the volute tongue 13 can be reduced, vibration and noise generated by unstable air flow at the volute tongue 13 can be reduced, the air flow can flow more smoothly, and the effect of improving the working performance of the fan can be achieved. The side wall of the air outlet 12 is tangent to the side wall of the body 11, so that the wind resistance in the volute 10 can be reduced, and the effect of improving the working performance of the fan can be achieved.
The distance between one end of the vortex-preventing sheet 40, which is close to the air outlet 12, and the side wall of the air outlet 12 is 0.2-0.8 times the width of the air outlet 12, so that the distance between one end of the vortex-preventing sheet 40, which is close to the air outlet 12, and the side wall of the air outlet 12 can be prevented from being too close, and then the air on two sides of the vortex-preventing sheet 40 can be smoothly discharged after being split by the vortex-preventing sheet 40, and the effect of noise reduction and working performance can be guaranteed.
The distance between one end of the vortex-preventing sheet 40, which is close to the impeller 30, and the volute tongue 13 is 0.2-0.8 times the width of the air outlet 12, so that the distance between one end of the vortex-preventing sheet 40, which is close to the impeller 30, and the side wall of the air outlet 12 can be prevented, the gas split by the vortex-preventing sheet 40 can flow to the two sides of the vortex-preventing sheet 40 more smoothly, and is discharged through the air outlet 12, and the noise reduction effect and the working performance can be guaranteed.
Through the arrangement of the arc-shaped surface 42, the airflow can flow on the side wall of the vortex-preventing piece 40 more smoothly, the wind resistance in the volute 10 is reduced, and the effect of improving the working performance of the centrifugal fan is achieved.
The radius of the arc-shaped surface 42 is larger than 1.2 times of the maximum outer diameter of the impeller 30, and the overlarge thickness of one end of the vortex-preventing sheet 40 caused by the too small radius of the arc-shaped surface 42 is prevented, so that the influence of the vortex-preventing sheet 40 on the air exhaust volume of the centrifugal fan is reduced, and the effect of improving the performance of the fan is achieved.
The radius of the arc-shaped surface 42 is smaller than 2 times of the maximum outer diameter of the impeller 30, so that the arc-shaped surface 42 is prevented from being invalid due to the fact that the radius of the arc-shaped surface 42 is too large, and the air flow can flow on the arc-shaped surface 42 more smoothly.
Current is supplied to the stator coil 24, so that a magnetic field is generated around the stator coil 24, and the permanent magnet 22, the rotor housing 21 and the impeller 30 are driven to rotate by the magnetic field, thereby realizing the function of driving the impeller 30 to rotate in the volute 10 by the driving device 20.
Through the integrated design of the mounting platform 16 and the stator housing 23, and the rotor housing 21 and the impeller 30 are arranged in the volute 10, the volume of the fan can be effectively reduced, and the advantage of more compact structure is achieved.
Through the setting of arc section and strengthening rib 17, can improve the stability of mounting platform 16, make mounting platform 16 can more stably support axis of rotation 25, rotor housing 21 and impeller 30, effectively improve the stability of impeller 30, reduce the vibration when impeller 30 rotates, make impeller 30 rotate the in-process more stable, play the effect of reducing the noise that the centrifugal fan during operation produced, reach the lower advantage of noise decibel value.
Through the setting of 2 air outlets 12, can satisfy people's user demand through different air outlets 12, reach the effect that improves the suitability. The azimuth angle difference of the two volute tongues 13 is set at 160-200 degrees, so that the phenomenon that parameters of the volute 10 at the two volute tongues 13 are excessively influenced due to the fact that the two volute tongues 13 are too close to each other is avoided, and the effect of noise reduction and working performance of the fan are guaranteed.
Example 2:
referring to fig. 5, a centrifugal fan with a vortex sheet is different from embodiment 1 in that: the number of the vortex-preventing sheets 40 is 2, and the 2 vortex-preventing sheets 40 are respectively in one-to-one correspondence with the 2 volute tongues 13.
This embodiment has the following advantages:
in the conventional fan, when the double air outlets are designed, parameters of the spiral case 10 at the two air outlets 12 are mutually influenced, so that air flow is not sufficiently diffused in each section of spiral case 10, and the design difficulty of optimizing the parameters of the spiral case 10 is high. Through set up in spiral case 10 and prevent vortex sheet 40, through prevent vortex sheet 40 reposition of redundant personnel after, effectively improved the insufficient problem of air current diffusion in the spiral case 10, further control the air flow in spiral case 10 through preventing vortex sheet 40 for centrifugal fan export flow field structure that two air outlets 12 design obtains improving, plays noise reduction, improves the effect of noise tone quality, has increased the mode that an air flow control influences, is particularly useful for the centrifugal fan of two air-out designs.
Example 3:
referring to fig. 6, a centrifugal fan with a vortex sheet is different from embodiment 1 in that: the vortex sheet 40 is provided with a plurality of diversion holes 41.
This embodiment has the following advantages:
through set up the reposition of redundant personnel hole 41 on preventing vortex sheet 40, make the air of preventing vortex sheet 40 both sides can pass reposition of redundant personnel hole 41 and flow to make prevent vortex sheet 40 when playing certain reposition of redundant personnel effect, can also compromise the performance promotion of centrifugal fan output amount of wind, and have the effect of control noise. The advantages of good noise reduction effect, good air outlet stability and large output air quantity are achieved.
Example 4:
referring to fig. 7, a centrifugal fan with a vortex sheet is different from embodiment 1 in that: a spacer 43 is provided between the end of the vortex sheet 40 adjacent to the air outlet 12 and the air outlet 12. Distance b from intersection position of vortex-preventing sheet 40 and air outlet 12 to one side wall of air outlet 12 2 ＝a 3 *b 1 Wherein the coefficient a 3 0.2 to 0.8, b 1 Which is the width of the air outlet 12. The end of the vortex plate 40 near the impeller 30 is spaced from the volute tongue 13 by a distance C 1 ＝a4*b 1 Wherein the coefficient a4 is 0.2 to 0.8, b 1 Which is the width of the air outlet 12.
This embodiment has the following advantages:
by arranging the spacing areas 43, the length of the vortex-preventing piece 40 is shortened, and the shorter vortex-preventing piece 40 is adopted, so that the effects of saving materials and facilitating production and manufacturing can be achieved.
The distance from the intersection position of the surface of the vortex-preventing piece 40 and the air outlet 12 to one side wall of the air outlet 12 is b2, so that the phenomenon that one end of the vortex-preventing piece 40 close to the air outlet 12 is too close to the side wall of the air outlet 12 can be prevented, and then gas on two sides of the vortex-preventing piece 40 can be smoothly discharged after being split by the vortex-preventing piece 40, and the effect of noise reduction and the effect of working performance are guaranteed.
Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not constitute any limitation on the utility model.
Claims (4)
1. The utility model provides a centrifugal fan with prevent scroll, includes spiral case (10), drive arrangement (20) and impeller (30), drive arrangement (20) are connected with spiral case (10) and impeller (30) respectively, spiral case (10) include body (11), air outlet (12) and volute tongue (13) all with body (11) fixed connection, impeller (30) are located spiral case (10), its characterized in that: the volute (10) is fixedly connected with a vortex-preventing piece (40), the vortex-preventing piece (40) extends towards the air outlet (12), and the distance between the vortex-preventing piece (40) and the rotation center of the impeller (30) is D 2 =a 1 *D 1 Wherein the coefficient a1 is 1.05-1.4, D 1 Is the maximum outer diameter of the impeller (30);
the vortex-preventing piece (40) is provided with a diversion hole (41);
the distance b from the intersection position of the surface of the vortex-preventing sheet (40) and the air outlet (12) to one side wall of the air outlet (12) 2 =a 3 *b 1 Wherein the coefficient a 3 0.2 to 0.8, b 1 Is the width of the air outlet (12);
the distance between one end of the vortex-preventing piece (40) close to the impeller (30) and the volute tongue (13) is C 1 =a4*b 1 Wherein the coefficient a4 is 0.2 to 0.8, b 1 For the width of the air outlet (12), one side of the vortex-preventing piece (40) far away from the volute tongue (13) is provided with an arc-shaped surface (42), and the radius R of the arc-shaped surface (42) 3 =a 2 *D 1 Wherein the coefficient a 2 1.2-2;
the side wall contour line of the body (11) is a spiral line, and the circle center of the spiral contour line of the side wall of the body (11) is positioned atThe distance relation between the spiral contour line of the side wall of the body (11) and the circle center accords with the equation on the rotation axis of the impeller (30):wherein r is the maximum outer circle radius of the impeller (30), t is the gap width between the volute tongue (13) and the impeller (30), alpha is the helix angle, phi is the azimuth angle of the helix line taking the rotation center of the impeller (30) as the center, phi 0 An azimuth angle of a volute tongue (13) tangential to the spiral line, wherein R is the radial coordinate of the spiral contour line;
2 air outlets (12) and volute tongues (13) are arranged in total, 2 volute tongues (13) and 2 air outlets (12) are in one-to-one correspondence, and the azimuth angle difference phi 2 of the 2 volute tongues (13) is 160-200 degrees;
the number of the vortex-preventing sheets (40) is 2, and the 2 vortex-preventing sheets (40) are respectively in one-to-one correspondence with the 2 volute tongues (13).
2. The centrifugal fan with vortex sheet according to claim 1, wherein: the side wall contour line of the air outlet (12) is a straight line, the contour line of the volute tongue (13) is arc-shaped, two side walls of the air outlet (12) are tangent with the volute tongue (13) and the side wall of the body (11) respectively, and the volute tongue (13) is tangent with the side wall of the body (11).
3. The centrifugal fan with vortex sheet according to claim 1, wherein: the driving device (20) comprises a rotor shell (21), a permanent magnet (22), a stator shell (23) and a stator coil (24), wherein the permanent magnet (22) is fixedly connected with the inner wall of the rotor shell (21), the rotor shell (21) is fixedly connected with an impeller (30), the stator coil (24) is fixedly connected with the stator shell (23), the rotor shell (21) is fixedly installed in the volute (10), the stator coil (24) is located in the rotor shell (21), and the impeller (30) is fixedly connected with a rotating shaft (25) which is rotationally connected with the volute (10).
4. The centrifugal fan with vortex sheet according to claim 1, wherein: the spiral case (10) still includes the base, the base includes arc (15), mounting platform (16) and strengthening rib (17), arc (15) respectively with body (11) and mounting platform (16) fixed connection, strengthening rib (17) respectively with arc (15) and mounting platform (16) fixed connection, drive arrangement (20) are connected with mounting platform (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210002544.6A CN114352574B (en) | 2022-01-04 | 2022-01-04 | Centrifugal fan with vortex-proof sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210002544.6A CN114352574B (en) | 2022-01-04 | 2022-01-04 | Centrifugal fan with vortex-proof sheet |
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| JP2002339897A (en) * | 2001-05-17 | 2002-11-27 | Daikin Ind Ltd | Impeller for blower |
| CN105756994A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | High-efficiency low-noise volute centrifugal fan |
| CN112253495A (en) * | 2020-09-11 | 2021-01-22 | 宁波方太厨具有限公司 | Fan system and range hood with same |
| CN113586482A (en) * | 2021-08-09 | 2021-11-02 | 佛山市南海九洲普惠风机有限公司 | Multi-wing centrifugal fan |
| CN114352573A (en) * | 2022-01-04 | 2022-04-15 | 泛仕达机电股份有限公司 | Compact centrifugal fan |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI303551B (en) * | 2004-10-15 | 2008-11-21 | Delta Electronics Inc | Heat dissipation module and flow direction control structure thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002339897A (en) * | 2001-05-17 | 2002-11-27 | Daikin Ind Ltd | Impeller for blower |
| CN105756994A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | High-efficiency low-noise volute centrifugal fan |
| CN112253495A (en) * | 2020-09-11 | 2021-01-22 | 宁波方太厨具有限公司 | Fan system and range hood with same |
| CN113586482A (en) * | 2021-08-09 | 2021-11-02 | 佛山市南海九洲普惠风机有限公司 | Multi-wing centrifugal fan |
| CN114352573A (en) * | 2022-01-04 | 2022-04-15 | 泛仕达机电股份有限公司 | Compact centrifugal fan |
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