CN117090810B - Frequency modulation and vibration prevention device for auxiliary fan mesh enclosure and use method of frequency modulation and vibration prevention device - Google Patents
Frequency modulation and vibration prevention device for auxiliary fan mesh enclosure and use method of frequency modulation and vibration prevention device Download PDFInfo
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- CN117090810B CN117090810B CN202311352167.XA CN202311352167A CN117090810B CN 117090810 B CN117090810 B CN 117090810B CN 202311352167 A CN202311352167 A CN 202311352167A CN 117090810 B CN117090810 B CN 117090810B
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- 230000002265 prevention Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 3
- 238000012827 research and development Methods 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a frequency modulation and vibration prevention device for an auxiliary fan mesh enclosure and a use method thereof. The device for assisting the frequency modulation and vibration prevention of the fan net cover comprises an axial fixing assembly and a concentric ring fixing assembly, and is arranged on the fan net cover in an auxiliary mode to conduct frequency modulation and vibration prevention. When the difference is in resonance with the traditional fan, the calculation, the manufacture of a new net cover and the vibration test are required to be repeated until the vibration is avoided successfully. The invention provides specific geometric parameters for improving the rigidity of the mesh enclosure, the device can directly improve the rigidity and the inherent frequency of the existing mesh enclosure, assist technicians to quickly determine the vibration-proof effect of the main rib, the auxiliary rib and the concentric ring after the rigidity is improved, and reduce the cost for manufacturing the new mesh enclosure and the research and development period.
Description
Technical Field
The invention relates to the technical field of frequency modulation and vibration prevention of fans, in particular to a device for assisting in frequency modulation and vibration prevention of a fan mesh enclosure and a use method of the device.
Background
Axial-flow fans are accepted by the industries of ventilation, equipment refrigeration, heating ventilation and the like by virtue of the characteristics of small volume, stable operation and high efficiency, but the situation of fatigue failure is not rare. There are many reasons for the fan to be in accident, and the most non-negligible reason is fan resonance.
When the excitation frequency is the same as or relatively close to the vibration frequency of the integral structure of the fan, resonance phenomenon is easy to occur. After resonance occurs, the fan is in a severe working environment for a long time, which may result in: 1) Breaking and invalidating the welded part of the impeller root and the mesh enclosure; 2) Abnormal sound and abrasion of the bearing; 3) The fasteners such as bolts, rivets and the like are loosened. The occurrence of the above phenomenon shortens the life of the blower, and therefore, resonance problems must be found and solved in the design stage and the test stage.
When the actually measured vibration value of the fan exceeds the standard value, the prior art avoids resonance treatment:
1) The excitation frequency is changed, for example, the working rotation speed of the fan is adjusted according to Chinese patent CN110594183A, so that the fan is prevented from resonating, but the method changes the air quantity, and has larger influence on ventilation and heat dissipation performance of the fan.
2) Vibration reduction structures such as the vibration reduction structure introduced in Chinese patent CN114893451A are added, but the method complicates a fan system, and the vibration reduction structure cannot be matched with a plurality of fan types, so that the cost of the fan is high.
3) The natural frequency of the integral structure of the fan is changed, and resonance points are avoided. According to the technical scheme, the frequencies of the supporting structures such as the mesh enclosure, the panel and the bracket are adjusted according to the mode shape, the frequencies are generally adjusted upwards by improving the structural rigidity, otherwise, the frequencies are less adjusted downwards for vibration prevention, and the working rotating speed interval of the fan can be reduced, so that the structural rigidity is reduced.
When the mesh enclosure is subjected to frequency modulation, as deviation exists between the simulation value and the test value, whether the improved new mesh enclosure structure can achieve the ideal vibration-proof effect cannot be determined, and therefore calculation, new mesh enclosure manufacturing and testing are continuously performed, and the research and development cost is high and the period is long.
Therefore, a method or device is urgently needed, and the vibration-proof effect of the mesh enclosure after the natural frequency of the mesh enclosure is adjusted can be conveniently and rapidly determined, so that the direction is provided for the subsequent vibration-proof scheme.
Disclosure of Invention
In order to solve the technical problems, the invention designs a device for assisting a fan guard in frequency modulation and vibration prevention and a use method thereof.
The invention adopts the following technical scheme:
a device for assisting a fan mesh enclosure in frequency modulation and vibration prevention comprises an axial fixing assembly and a concentric ring fixing assembly;
the axial fixing component comprises a disc-shaped retainer and a U-shaped bolt, the disc-shaped retainer consists of a central annular frame and an outer edge cross edge, the central annular frame is matched with a central hole of the net cover, and the outer edge cross edge is matched with a main rib of the net cover; the outer edge of the cross edge is correspondingly provided with a plurality of U-shaped bolts, and the disc-shaped retainer is fixed on the main rib of the net cover through the U-shaped bolts and nuts;
the concentric ring fixing assembly comprises an L-shaped sliding rail and a net cover concentric ring clamping clamp, the L-shaped sliding rail is fixedly arranged on the disc-type retainer through bolts, a transverse sliding rail and a longitudinal sliding rail are respectively arranged on the L-shaped sliding rail, a plurality of net cover concentric ring clamping clamps which move along the transverse sliding rail and the longitudinal sliding rail to adjust positions are respectively arranged in the transverse sliding rail and the longitudinal sliding rail, and the net cover concentric ring clamping clamps are clamped and fixed on the net cover concentric ring.
Preferably, the outer edge cross edge corresponds both sides and has seted up the removal groove respectively, installs a plurality of U type bolts in the removal groove, and U type bolt both ends threaded connection has the nut.
Preferably, an adjusting and mounting groove is formed in the L-shaped sliding rail, a bolt capable of adjusting the mounting position along the adjusting and mounting groove is arranged in the adjusting and mounting groove, and the L-shaped sliding rail is fastened and mounted on the disc-type retainer through the bolt, the gasket and the nut respectively.
As the preference, the concentric circle centre gripping of screen panel presss from both sides including full thread bolt pole, T type slider, connecting sleeve and draw-in groove, and T type slider is located the horizontal slide rail and the vertical slide rail of L type slide rail, adopts clearance fit, but the free slip, threaded connection full thread bolt pole on the T type slider, and full thread bolt pole is terminal installs connecting sleeve through the screw thread, fixedly connected with draw-in groove on the connecting sleeve, and it is spacing through the nut fastening on the full thread bolt pole.
Preferably, the L-shaped sliding rails are fixedly arranged between adjacent outer edge cross edges on the disc-shaped retainer through bolts respectively.
Preferably, the clamping groove is bonded on the connecting sleeve through glue.
The application method of the device for assisting the frequency modulation and vibration prevention of the fan guard comprises the following steps:
s1, selecting a fan guard needing frequency modulation and vibration isolation; the axial fixing component is arranged on a fan net cover needing frequency modulation and vibration isolation, so that the rigidity and the inherent frequency of a main rib of the existing net cover are improved;
s2, carrying out vibration test on the fan provided with the axial fixing component, and testing the vibration value of the fan within the working rotating speed range;
s3, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the main rib of the mesh enclosure is required to be improved, and the rigidity of the main rib is improved;
s4, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails; the axial fixing component and the concentric ring fixing component are arranged on the fan net cover together, so that the rigidity and the inherent frequency of the auxiliary ribs and the concentric rings of the existing net cover are continuously improved;
s5, vibration testing is carried out on the fan guard provided with the axial fixing component and the concentric ring fixing component, and the vibration value of the fan in the working rotating speed range is tested;
s6, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the auxiliary ribs and the concentric rings of the mesh enclosure are required to be improved, and the rigidity of the auxiliary ribs and the concentric rings is improved;
s7, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails, and the fact that the frequency modulation vibration prevention effect of the fan guard is not obvious is confirmed, and other parts are improved.
Preferably, in step S3, the main rib stiffness is increased by increasing the thickness d or the height h of the main rib.
Preferably, in step S4, the positions and the number of the clamping clips of the concentric ring fixing assembly mounted on the fan screen cover are determined by the front sixth-order mode shape of the screen cover.
Preferably, in step S6, the rigidity of the auxiliary ribs and the concentric rings is improved by increasing the section diameter D of the auxiliary ribs 1 Increase the cross-sectional diameter D of concentric rings 2 。
The beneficial effects of the invention are as follows: when the difference is in resonance with the traditional fan, the calculation, the manufacture of a new net cover and the vibration test are required to be repeated until the vibration is avoided successfully. The invention provides specific geometric parameters for improving the rigidity of the mesh enclosure, the device can directly improve the rigidity and the inherent frequency of the existing mesh enclosure, assist technicians to quickly determine the vibration-proof effect of the main rib, the auxiliary rib and the concentric ring after the rigidity is improved, and reduce the cost for manufacturing the new mesh enclosure and the research and development period.
Drawings
FIG. 1 is a schematic diagram of a frequency modulation and vibration isolation device for an auxiliary fan guard according to the present invention;
FIG. 2 is a schematic illustration of the mounting of the axial retention assembly to the screen;
FIG. 3 is a schematic view of a structure in which the axial retention assembly and concentric ring retention assembly of the present invention are mounted to a cage;
FIG. 4 is a schematic view of a construction of a disc-shaped cage of the present invention;
FIG. 5 is a schematic view of an L-shaped rail according to the present invention;
FIG. 6 is a schematic view of a T-shaped slider according to the present invention;
FIG. 7 is a schematic view of a connecting sleeve according to the present invention;
FIG. 8 is a schematic view of a card slot according to the present invention;
FIG. 9 is a schematic view of an axial securing assembly according to the present invention;
FIG. 10 is a schematic illustration of a concentric ring fixture assembly of the present invention;
FIG. 11 is a process flow diagram of a method of use in the present invention;
FIG. 12 is a schematic view of a structure of a main reinforcement according to the present invention;
FIG. 13 is a schematic view of a structure of the secondary reinforcement of the present invention;
FIG. 14 is a schematic view of a concentric ring configuration of the present invention;
in the figure: 1. a disk-type holder; 2. u-shaped bolts; 3. an L-shaped sliding rail; 4. a full thread bolt shank; 5. a T-shaped slider; 6. a connecting sleeve; 7. a clamping groove; 8. a nut; 9. a bolt; 10. a main rib; 11. auxiliary ribs; 12. concentric rings.
Detailed Description
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
examples: as shown in fig. 1-8, a device for assisting a fan guard in frequency modulation and vibration isolation comprises an axial fixing assembly and a concentric ring fixing assembly;
the axial fixing component comprises a disc-shaped retainer 1 and a U-shaped bolt 2, wherein the disc-shaped retainer consists of a central annular frame and an outer edge cross edge, the central annular frame is matched with a central hole of the net cover, and the outer edge cross edge is matched with a main rib 10 of the net cover; two U-shaped bolts are correspondingly arranged on the outer edge of the cross, and the disc-shaped retainer is fixed on the main rib of the net cover through the U-shaped bolts and nuts;
the concentric ring fixing assembly comprises an L-shaped sliding rail 3 and a mesh cover concentric ring clamping clamp, the L-shaped sliding rail is fixedly arranged on the disc-type retainer through bolts, a transverse sliding rail and a longitudinal sliding rail are respectively arranged on the L-shaped sliding rail, a plurality of mesh cover concentric ring clamping clamps which move along the transverse sliding rail and the longitudinal sliding rail to adjust positions are respectively arranged in the transverse sliding rail and the longitudinal sliding rail, and the mesh cover concentric ring clamping clamps are clamped and fixed on the mesh cover concentric ring.
The outer edge of the cross edge is provided with a moving groove corresponding to two edges respectively, two U-shaped bolts are installed in the moving groove, and nuts are connected with two ends of each U-shaped bolt in a threaded manner.
An adjusting installation groove is formed in the L-shaped sliding rail, a bolt capable of adjusting the installation position along the adjusting installation groove is arranged in the adjusting installation groove, and the L-shaped sliding rail is fastened and installed on the disc-type retainer through a bolt 9, a gasket and a nut.
The concentric circle clamping clamp of screen panel includes full thread bolt pole 4, T type slider 5, connecting sleeve 6 and draw-in groove 7, and T type slider is located the horizontal slide rail and the vertical slide rail of L type slide rail, adopts clearance fit, can freely slide, threaded connection full thread bolt pole on the T type slider, and full thread bolt pole end installs connecting sleeve through the screw thread, fixedly connected with draw-in groove on the connecting sleeve, fastens spacingly through nut 8 on the full thread bolt pole.
The L-shaped sliding rails are fixedly arranged between adjacent outer edges of the disc-shaped retainer through bolts respectively. The clamping groove is adhered to the connecting sleeve through glue.
As shown in FIG. 9, the disk-shaped retainer of the present invention can be mounted on mesh enclosures of different sizes, specifically by adjusting the distance L from the U-shaped bolt to the center 1 、L 2 Realizing the method.
As shown in FIG. 10, the L-shaped slide rail of the invention can be mounted on mesh enclosures with different sizes, and particularly can be mounted by adjusting the distance L between the end part of the slide rail and a fixing bolt 3 Height L of the clamping groove 5 GasketHeight L 6 Realizing the method.
The concentric ring fixing component can be used for fixing the concentric rings of the mesh enclosure with different sparseness degrees, in particular by adjusting the spacing L of the clamping grooves 4 The number and the positions of the net cover are determined by the mode shape of the net cover simulation result.
The clamping groove of the invention can fix concentric rings with different radiuses, and the opening radius R of the clamping groove 1 、R 2 For fixing radius R 1 And R is 2 Is provided.
As shown in fig. 11, a method for using a device for assisting a fan guard to perform frequency modulation and vibration isolation includes the following steps:
s1, selecting a fan guard needing frequency modulation and vibration isolation; the axial fixing component is arranged on a fan net cover needing frequency modulation and vibration isolation, so that the rigidity and the inherent frequency of a main rib of the existing net cover are improved;
s2, carrying out vibration test on the fan provided with the axial fixing component, and testing the vibration value of the fan within the working rotating speed range;
s3, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the main rib of the mesh enclosure is required to be improved, and the rigidity of the main rib is improved;
s4, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails; the axial fixing component and the concentric ring fixing component are arranged on the fan net cover together, so that the rigidity and the natural frequency of the auxiliary ribs 11 and the concentric rings 12 of the existing net cover are continuously improved;
s5, vibration testing is carried out on the fan guard provided with the axial fixing component and the concentric ring fixing component, and the vibration value of the fan in the working rotating speed range is tested;
s6, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the auxiliary ribs and the concentric rings of the mesh enclosure are required to be improved, and the rigidity of the auxiliary ribs and the concentric rings is improved;
s7, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails, and the fact that the frequency modulation vibration prevention effect of the fan guard is not obvious is confirmed, and other parts are improved.
As shown in fig. 12, in step S3, the main rib stiffness is increased by increasing the thickness d or the height h of the main rib.
In step S4, the positions and the number of clamping clamps of the concentric ring fixing assembly arranged on the fan screen cover are determined by the front sixth-order mode shape of the screen cover.
As shown in fig. 13-14, in step S6, the stiffness of the auxiliary rib and the concentric ring is increased by increasing the sectional diameter D of the auxiliary rib 1 Increase the cross-sectional diameter D of concentric rings 2 。
Resonance occurs in the normal working rotation speed range (870-950 rpm) of a certain type of axial flow fan, and software simulation data are given, as shown in the following table:
table 1 first 6 order natural frequency/Hz comparison
| Sequence number | Test protocol | 1 | 2 | 3 | 4 | 5 | 6 |
| 1 | Blower fan | 15.793 | 28.732 | 28.734 | 46.788 | 47.459 | 47.534 |
| 2 | Fan+axial fixing assembly | 27.398 | 27.413 | 36.92 | 49.916 | 49.987 | 50.046 |
| 3 | Fan + axial fixation assembly + concentric ring fixation assembly | 35.713 | 35.723 | 37.277 | 44.545 | 47.459 | 47.534 |
The table above shows that: the natural frequency of the 1 st order of the fan is 15.793Hz, namely resonance is possible when the rotating speed is 948 rpm; after the axial fixing component of the device is additionally arranged on the mesh enclosure, the first 6-order frequency is larger than 27.398Hz, namely resonance cannot occur in the working rotating speed range of the fan. After the axial fixing component and the concentric ring fixing component of the device are completely added to the net cover, the first 6-order frequency is larger than 35.713Hz, and resonance can not occur in the working rotating speed range of the fan. Table 1 frequency comparison
According to the technical scheme of the invention, the test scheme 2 shows that: the rigidity of the main reinforcement is improved, and the vibration-proof effect is obvious. The main rib rigidity of the mesh enclosure is improved by the clear improvement scheme, and the thickness d and the height h are properly increased, so that the first-order mode value of the mesh enclosure exceeds 17.5Hz (1.1 times of the corresponding frequency of the rotating speed of 950 rpm), and resonance is avoided.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (9)
1. The device for assisting the frequency modulation and vibration prevention of the fan guard is characterized by comprising an axial fixing assembly and a concentric ring fixing assembly;
the axial fixing component comprises a disc-shaped retainer and a U-shaped bolt, the disc-shaped retainer consists of a central annular frame and an outer edge cross edge, the central annular frame is matched with a central hole of the net cover, and the outer edge cross edge is matched with a main rib of the net cover; the outer edge of the cross edge is correspondingly provided with a plurality of U-shaped bolts, and the disc-shaped retainer is fixed on the main rib of the net cover through the U-shaped bolts and nuts;
the concentric ring fixing assembly comprises an L-shaped sliding rail and a net cover concentric ring clamping clamp, the L-shaped sliding rail is fixedly arranged on the disc-shaped retainer through bolts, a transverse sliding rail and a longitudinal sliding rail are respectively arranged on the L-shaped sliding rail, a plurality of net cover concentric ring clamping clamps which move along the transverse sliding rail and the longitudinal sliding rail to adjust positions are respectively arranged in the transverse sliding rail and the longitudinal sliding rail, and the net cover concentric ring clamping clamps are clamped and fixed on the net cover concentric ring;
the concentric circle clamping clamp of screen panel includes full thread bolt pole, T type slider, connecting sleeve and draw-in groove, and T type slider is located the horizontal slide rail and the vertical slide rail of L type slide rail, adopts clearance fit, can freely slide, threaded connection full thread bolt pole on the T type slider, and full thread bolt pole end installs connecting sleeve through the screw thread, fixedly connected with draw-in groove on the connecting sleeve, and it is spacing through the nut fastening on the full thread bolt pole.
2. The device for assisting the frequency modulation and vibration prevention of the fan guard according to claim 1, wherein the outer edge cross edge is provided with moving grooves corresponding to two edges respectively, a plurality of U-shaped bolts are installed in the moving grooves, and nuts are connected with two ends of the U-shaped bolts in a threaded mode.
3. The device for assisting a fan guard to regulate frequency and avoid vibration according to claim 1, wherein the L-shaped slide rail is provided with an adjusting installation groove, a bolt capable of adjusting the installation position along the adjusting installation groove is arranged in the adjusting installation groove, and the L-shaped slide rail is fastened and installed on the disc-shaped retainer through the bolt, the gasket and the nut respectively.
4. The device for assisting the frequency modulation and vibration prevention of the fan guard according to claim 3, wherein the L-shaped sliding rails are fixedly arranged between adjacent outer edges of the disc-shaped retainer through bolts respectively.
5. The device for assisting a fan guard in frequency modulation and vibration isolation according to claim 4, wherein the clamping groove is bonded on the connecting sleeve through glue.
6. A method for using the device for assisting the frequency modulation and vibration prevention of the fan guard according to any one of claims 1 to 5, comprising the following steps:
s1, selecting a fan guard needing frequency modulation and vibration isolation; the axial fixing component is arranged on a fan net cover needing frequency modulation and vibration isolation, so that the rigidity and the inherent frequency of a main rib of the existing net cover are improved;
s2, carrying out vibration test on the fan provided with the axial fixing component, and testing the vibration value of the fan within the working rotating speed range;
s3, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the main rib of the mesh enclosure is required to be improved, and the rigidity of the main rib is improved;
s4, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails; the axial fixing component and the concentric ring fixing component are arranged on the fan net cover together, so that the rigidity and the inherent frequency of the auxiliary ribs and the concentric rings of the existing net cover are continuously improved;
s5, vibration testing is carried out on the fan guard provided with the axial fixing component and the concentric ring fixing component, and the vibration value of the fan in the working rotating speed range is tested;
s6, comparing the actually measured vibration value with the standard vibration value, wherein the actually measured vibration value is smaller than or equal to the standard vibration value, so that the vibration is successfully avoided, and only the auxiliary ribs and the concentric rings of the mesh enclosure are required to be improved, and the rigidity of the auxiliary ribs and the concentric rings is improved;
s7, if the actually measured vibration value is larger than the standard vibration value, the vibration prevention fails, and the fact that the frequency modulation vibration prevention effect of the fan guard is not obvious is confirmed, and other parts are improved.
7. The method of using the frequency modulation and vibration isolation device for an auxiliary fan guard according to claim 6, wherein in step S3, the main rib stiffness is increased by increasing the thickness d or the height h of the main rib.
8. The method of claim 6, wherein in step S4, the positions and the number of clamping clips of the concentric ring fixing assembly mounted on the fan screen are determined by the front sixth-order mode shape of the screen.
9. The method of using a frequency modulation vibration isolation device for auxiliary fan guard according to claim 6, wherein in step S6, increasing the sectional diameter D of the auxiliary ribs is adopted to increase the rigidity of the auxiliary ribs and the concentric rings 1 Increase the cross-sectional diameter D of concentric rings 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311352167.XA CN117090810B (en) | 2023-10-19 | 2023-10-19 | Frequency modulation and vibration prevention device for auxiliary fan mesh enclosure and use method of frequency modulation and vibration prevention device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311352167.XA CN117090810B (en) | 2023-10-19 | 2023-10-19 | Frequency modulation and vibration prevention device for auxiliary fan mesh enclosure and use method of frequency modulation and vibration prevention device |
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| CN117090810A CN117090810A (en) | 2023-11-21 |
| CN117090810B true CN117090810B (en) | 2024-01-26 |
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| CN (1) | CN117090810B (en) |
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| CN215979993U (en) * | 2021-10-11 | 2022-03-08 | 苏州众志新环冷却设备有限公司 | Damping device of axial flow fan |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10641293B2 (en) * | 2016-09-20 | 2020-05-05 | Dell Products L.P. | Fan suspension system to provide vibration isolation, secure mounting, and thermal seal |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080092034A (en) * | 2007-04-11 | 2008-10-15 | 한라공조주식회사 | Fan and shroud assembly |
| KR20100063966A (en) * | 2008-12-04 | 2010-06-14 | 현대중공업 주식회사 | Fine frequency tunable dynamic absorber for diesel generator set and fine frequency tunable method thereof |
| CN202216840U (en) * | 2011-09-07 | 2012-05-09 | 杭州微光电子股份有限公司 | Sliding type adjustable external rotor blower fan test rack |
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| CN111765204A (en) * | 2020-05-14 | 2020-10-13 | 北京工业大学 | Suspension type silica gel self-adaptive frequency modulation vibration absorption device |
| CN113847284A (en) * | 2021-10-11 | 2021-12-28 | 珠海格力电器股份有限公司 | Anti-shaking net cover and fan |
| CN215979993U (en) * | 2021-10-11 | 2022-03-08 | 苏州众志新环冷却设备有限公司 | Damping device of axial flow fan |
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| CN117090810A (en) | 2023-11-21 |
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