CN114033720A - Fan base, fan overall equipment and fan vibration control method - Google Patents
Fan base, fan overall equipment and fan vibration control method Download PDFInfo
- Publication number
- CN114033720A CN114033720A CN202111221216.7A CN202111221216A CN114033720A CN 114033720 A CN114033720 A CN 114033720A CN 202111221216 A CN202111221216 A CN 202111221216A CN 114033720 A CN114033720 A CN 114033720A
- Authority
- CN
- China
- Prior art keywords
- fan
- base
- fan base
- modal
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 230000004044 response Effects 0.000 claims description 19
- 230000005484 gravity Effects 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000005284 excitation Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
-
- 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
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention particularly relates to a fan base, wherein the rigidity of the fan base is improved by diagnosing faults of the existing fan base according to modal shape data of a model; and a steel wire rope isolator is arranged on the fan base. The fan base provided by the invention can effectively isolate and reduce fan vibration and improve the running reliability of the fan.
Description
Technical Field
The invention relates to the technical field of fan control of nuclear power plants, in particular to a fan base, fan overall equipment and a fan vibration control method.
Background
In a fan operated in a nuclear power plant, the frequent failure of the fan is represented by the fact that vibration exceeds standard (the flexible connection vibration standard is less than or equal to 5.5mm/s), the fan base is considered to be insufficient in rigidity through analysis, a rubber vibration isolator of the fan is easy to age, the vibration isolation performance is reduced, the inherent frequency of a system is about 11Hz according to the calculation of the weight of the existing whole equipment and the rigidity of the rubber vibration isolator, the frequency is higher, and the vibration isolation effect is not ideal. And the distribution position of the rubber vibration isolator has obvious unreasonable phenomenon and eccentric phenomenon, and vibration coupling can be generated during vibration, so that the vibration response control is not facilitated.
Disclosure of Invention
On the basis, the fan base, the fan overall equipment and the fan vibration control method are needed to solve the problem that the excitation speed of the fan base of factory and mine enterprises exceeds the standard, so that the fan vibration is effectively isolated and reduced, and the reliability of fan operation is improved.
In order to achieve the above purpose, the invention provides the following technical scheme:
the rigidity of the fan base is improved by diagnosing faults of the existing fan base according to modal shape data of a model; and a steel wire rope isolator is arranged on the fan base.
The working principle is as follows: according to the fan base, the first-order natural frequency of the fan base is improved by improving the rigidity characteristic. The steel wire rope vibration isolator reduces the first-order natural frequency of the fan base and improves the vibration isolation efficiency of the fan base.
Further, according to the actual state of the on-site fan of the factory and mine enterprise, SOLIDWORKS modeling is carried out on the existing fan base, and a finite element method is utilized to carry out modal analysis on the model to obtain the modal vibration type data of the model.
Further, the order of the mode shape is 10 orders.
Furthermore, the fan base ensures that the modal frequency of the fan base is obviously higher than the fan interference frequency through modal calculation, so that the phenomenon of resonance of the fan base is prevented; the fan base is prepared by adopting a steel plate welding forming process.
Further, the fan base is connected with the steel wire rope vibration isolator through bolts.
Furthermore, the type and the number of the steel wire rope isolators on the fan base are calculated and selected according to the sum of the weights of the motor, the fan and the fan base, and the natural frequency of the fan is adjusted to the peak response frequency F of the whole equipmentr。
Further, the peak response frequency F of the overall devicerGreater than or equal to 4Hz and less than or equal to 5 Hz.
Further, the calculation formula for selecting the types and the number of the steel wire rope vibration isolators is as follows:
in the formula (f)rThe peak response frequency of the whole device is in Hz; k is the static stiffness of a single vibration isolator, and the unit is N/m; a is the dynamic stiffness coefficient of a single vibration isolator; m is the bearing mass of a single vibration isolator, and the unit is kg.
The invention also provides integral equipment of the fan, which comprises the fan, the motor and the fan base.
The invention also provides a fan vibration control method, which comprises the following steps:
1. according to the actual state of the on-site fan of the factory and mine enterprise, SOLIDWORKS modeling is carried out on the existing fan base, and a finite element method is utilized to carry out modal analysis on the model so as to obtain the modal vibration mode of the model;
2. diagnosing faults existing in the existing fan base according to the modal shape data of the model, and adjusting the rigidity of the fan base;
3. calculating and selecting steel wire rope vibration isolators with proper types and numbers according to the sum of the weights of the motor, the fan and the fan base, and adjusting the natural frequency of the fan to the peak response frequency of the whole equipment;
4. obtaining the gravity center position of the whole equipment according to the gravity center positions of the motor, the fan and the fan base, and reasonably arranging the installation positions of the steel wire rope vibration isolators according to the moment balance principle;
5. the method is implemented on site according to the technical method;
the fan base is the fan base, and the whole equipment is the whole equipment.
The invention has the beneficial technical effects that:
according to the fan vibration control device and method, the first-order natural frequency of the fan base is improved by improving the rigidity characteristic of the fan base, and the first-order natural frequency of the fan base is greatly improved from 98.995HZ to 231.94 HZ; by calculating the reduction of the system natural frequency with the appropriate type of wire rope isolator,
drawings
FIG. 1 is a graph of a 10 th order natural frequency response of a fan vibration using a conventional fan mount;
FIG. 2 is a graph of the 10 th order natural frequency response of fan vibration when using the fan mount of the present invention;
FIG. 3 is a schematic view of a fan base structure according to the present invention;
FIG. 4 is a graph of vibration transfer for the overall apparatus;
fig. 5 is a static mechanical property curve diagram of the steel wire rope vibration isolator.
In the figure, 1, the fan base of the present invention; 2. a wire rope isolator.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Referring to fig. 3, the invention provides a fan base 1, and the rigidity of the fan base 1 is improved by diagnosing a fault of an existing fan base according to modal shape data of a model; and a steel wire rope isolator 2 is arranged on the fan base 1.
The working principle is as follows: according to the fan base 1, the first-order natural frequency of the fan base 1 is improved by improving the rigidity characteristic. The steel wire rope vibration isolator 2 reduces the first-order natural frequency of the fan base 1 and improves the vibration isolation efficiency of the fan base 1.
Further, according to the actual state of the on-site fan of the factory and mine enterprise, SOLIDWORKS modeling is carried out on the existing fan base, and a finite element method is utilized to carry out modal analysis on the model, so that the modal vibration type data of the model are obtained, wherein the modal vibration type data of the model comprise the natural frequency and the corresponding modal vibration type of the existing fan base.
Further, the order of the mode shape is 10 orders.
Further, the fan base 1 ensures that the modal frequency of the fan base 1 is obviously higher than the fan interference frequency through modal calculation, so that the fan base 1 is prevented from generating a resonance phenomenon; the fan base 1 is welded and formed by steel plates to increase the overall rigidity.
Further, the fan base 1 is connected with the steel wire rope vibration isolator 2 through bolts.
Furthermore, the types and the number of the steel wire rope isolators 2 on the fan base 1 are calculated and selected according to the sum of the weights of the motor, the fan and the fan base 1, and the natural frequency of the fan is adjusted to the peak response frequency F of the whole equipmentr。
Further, the peak response frequency F of the overall devicerGreater than or equal to 4Hz and less than or equal to 5 Hz.
Further, the calculation formula for selecting the types and the number of the wire rope vibration isolators 2 is as follows:
in the formula (1), frThe peak response frequency of the whole device is in Hz; k is the static stiffness of a single vibration isolator, and the unit is N/m; a is the dynamic stiffness coefficient of a single vibration isolator; m is the bearing mass of a single vibration isolator, and the unit is kg.
Further, the vibration transmission rate of the entire apparatus is calculated according to the following formula:
in the formula (2), x is a response amplitude; x0Is the excitation amplitude; zeta is damping ratio, take 0.15; λ is fi/frA value of (d); f. ofiAn external excitation frequency or an interference frequency; f. ofrIs the natural frequency of the overall device and is also the peak response frequency of the overall device.
Referring to fig. 2, the damping effect is generated when λ is greater than 6. Therefore, when the external interference frequency is greater than 5.9Hz, the whole equipment enters a vibration isolation area, and after the external interference frequency is greater than 12.6Hz, the system achieves a relatively ideal vibration isolation effect, and the vibration isolation efficiency is 80%. The actual excitation frequency of the whole equipment is about 25Hz, the frequency ratio lambda is about 6, and the vibration isolation effect can reach more than 95%.
The invention also provides integral equipment of the fan, which comprises the fan, a motor and the fan base 1.
The invention also provides a fan vibration control method, which uses the fan base 1 and the fan integral equipment, and comprises the following steps:
1. according to the actual state of the on-site fan of the factory and mine enterprise, SOLIDWORKS modeling is carried out on the existing fan base, and a finite element method is utilized to carry out modal analysis on the model so as to obtain the modal vibration mode of the model;
2. diagnosing faults existing in the existing fan base according to the modal shape data of the model, and adjusting the rigidity of the fan base;
3. calculating and selecting steel wire rope vibration isolators 2 with proper types and numbers according to the sum of the weights of the motor, the fan and the fan base 1, and adjusting the natural frequency of the fan to the peak response frequency of the whole equipment;
4. obtaining the gravity center position of the whole equipment according to the gravity center positions of the motor, the fan and the fan base, and reasonably arranging the installation positions of the steel wire rope vibration isolators according to the moment balance principle;
5. the method is implemented on site according to the technical method;
further, the excitation frequency of the fan is equal to the rotation speed of the motor/60 s, the unit of the excitation frequency of the fan is Hz, and the unit of the rotation speed of the motor is r/min.
The first order natural frequency of the existing fan base is 98.995 Hz. The existing fan base is provided with a rubber damper, and the rubber damper is hardened along with the increase of service life, so that the rigidity coefficient is increased, and the peak response frequency of the whole equipment is increased. The vibration of the existing fan fluctuates around 7 mm/s. The natural frequency of the existing integral equipment is about 11Hz, the frequency is higher, and the vibration isolation effect is not ideal. The distribution position of the rubber shock absorber has obvious unreasonable phenomenon and eccentric phenomenon, and vibration coupling can be generated during vibration, so that vibration response control is not facilitated.
The first-order natural frequency of the fan base 1 is greatly improved to 231.94Hz, and the dynamic rigidity characteristic of the fan base 1 is improved.
Referring to fig. 2, the steel wire rope vibration isolator 2 is arranged on the fan base 1, and the first-order to sixth-order natural frequencies of the whole equipment are lower than the corresponding natural frequency values of the existing whole equipment. The vibration of the fan is reduced to less than or equal to 2mm/s and is stable and far lower than the flexible connection vibration standard by 5.5 mm/s.
Based on the effects, the equipment and the method have the popularization significance of processing similar problems in other industrial and mining enterprises.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The fan base is characterized in that the rigidity of the fan base (1) is improved by diagnosing faults of the existing fan base according to modal shape data of a model; and a steel wire rope isolator (2) is arranged on the fan base (1).
2. The wind turbine base of claim 1, wherein the modal shape data of the model is obtained by performing SOLIDWORKS modeling on the existing wind turbine base according to the actual state of the field wind turbine of the factory and mining enterprise and performing modal analysis on the model by using a finite element method.
3. The blower base of claim 2, wherein the modal shape is of order 10.
4. The fan base according to claim 2, characterized in that the fan base (1) ensures that the modal frequency of the fan base (1) is significantly higher than the fan interference frequency by modal calculation; the fan base (1) is prepared by adopting a steel plate welding forming process.
5. The blower base according to claim 1, characterized in that the blower base (1) is connected with the wire rope vibration isolator (2) through bolts.
6. The fan base according to claim 1, characterized in that the type and number of the wire rope isolators (2) on the fan base (1) are selected according to the calculation of the sum of the weight of the motor, the fan and the fan base, and the natural frequency of the fan is adjusted to the peak response frequency F of the whole equipmentr。
7. The wind turbine base of claim 6, wherein the peak response frequency F of the unitary apparatusrGreater than or equal to 4Hz and less than or equal to 5 Hz.
8. The blower base according to claim 6, wherein the calculation formula for the types and the number of the wire rope vibration isolators (2) is as follows:
in the formula (f)rThe peak response frequency of the whole device is in Hz; k is the static stiffness of a single vibration isolator, and the unit is N/m; a is the dynamic stiffness coefficient of a single vibration isolator; m is the bearing mass of a single vibration isolator, and the unit is kg.
9. The integral fan equipment comprises a fan, a motor and a fan base, and is characterized in that the fan base is the fan base according to any one of claims 1 to 8.
10. A fan vibration control method is characterized by comprising the following steps:
step 1, according to the actual state of a field fan of a factory and mine enterprise, SOLIDWORKS modeling is carried out on the existing fan base, and a finite element method is utilized to carry out modal analysis on a model to obtain the modal vibration mode of the model;
step 2, diagnosing faults existing in the existing fan base according to the modal shape data of the model, and adjusting the rigidity of the fan base (1);
step 3, calculating and selecting steel wire rope vibration isolators with proper models and numbers according to the sum of the weights of the motor, the fan and the fan base (1), and adjusting the natural frequency of the fan to the peak response frequency of the whole equipment;
step 4, obtaining the gravity center position of the whole equipment according to the gravity center position of the motor, the fan and the fan base (1), and reasonably arranging the installation position of the steel wire rope vibration isolator (2) according to the moment balance principle;
step 5, implementing on site according to the technical method;
the blower base (1) is the blower base according to any one of claims 1 to 8, and the integrated device is the integrated device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111221216.7A CN114033720A (en) | 2021-10-20 | 2021-10-20 | Fan base, fan overall equipment and fan vibration control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111221216.7A CN114033720A (en) | 2021-10-20 | 2021-10-20 | Fan base, fan overall equipment and fan vibration control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114033720A true CN114033720A (en) | 2022-02-11 |
Family
ID=80142205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111221216.7A Pending CN114033720A (en) | 2021-10-20 | 2021-10-20 | Fan base, fan overall equipment and fan vibration control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114033720A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03175200A (en) * | 1989-12-04 | 1991-07-30 | Hitachi Ltd | Vibration isolator for blower |
| JP2000073996A (en) * | 1998-08-27 | 2000-03-07 | Ebara Corp | Blower |
| CN205065191U (en) * | 2015-09-24 | 2016-03-02 | 上海诺地乐通用设备制造有限公司 | Fan damping pedestal |
| CN107092758A (en) * | 2017-05-02 | 2017-08-25 | 句容市江电电器机械有限公司 | Blower fan structure design method |
| CN109948218A (en) * | 2019-03-12 | 2019-06-28 | 辽宁科技大学 | A kind of dynamic analysis method based on blower fan system |
| CN109960848A (en) * | 2019-01-17 | 2019-07-02 | 哈尔滨工程大学 | It avoids generating the mode preventing collision method to resonate |
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
-
2021
- 2021-10-20 CN CN202111221216.7A patent/CN114033720A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03175200A (en) * | 1989-12-04 | 1991-07-30 | Hitachi Ltd | Vibration isolator for blower |
| JP2000073996A (en) * | 1998-08-27 | 2000-03-07 | Ebara Corp | Blower |
| CN205065191U (en) * | 2015-09-24 | 2016-03-02 | 上海诺地乐通用设备制造有限公司 | Fan damping pedestal |
| CN107092758A (en) * | 2017-05-02 | 2017-08-25 | 句容市江电电器机械有限公司 | Blower fan structure design method |
| CN109960848A (en) * | 2019-01-17 | 2019-07-02 | 哈尔滨工程大学 | It avoids generating the mode preventing collision method to resonate |
| CN109948218A (en) * | 2019-03-12 | 2019-06-28 | 辽宁科技大学 | A kind of dynamic analysis method based on blower fan system |
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103047336B (en) | Method for controlling structural acoustic transmission on basis of combined type vibration isolation device | |
| Zhao et al. | Studies on application of scissor-jack braced viscous damper system in wind turbines under seismic and wind loads | |
| Struggl et al. | Review on wind turbines with focus on drive train system dynamics | |
| Helsen et al. | The dynamic behavior induced by different wind turbine gearbox suspension methods assessed by means of the flexible multibody technique | |
| CN201078433Y (en) | Electromagnetism dynamic vibration absorber | |
| CN103842645B (en) | The method and system of the wind turbine of electrical network it is connected to for operation | |
| CN109948218A (en) | A kind of dynamic analysis method based on blower fan system | |
| CN114033720A (en) | Fan base, fan overall equipment and fan vibration control method | |
| US20130333478A1 (en) | Nacelle test apparatus | |
| CN110360065A (en) | A kind of vibration absorber for Large Scale Oceanic Wind Power Generation machine tower top | |
| CN115059731B (en) | Spring pendulum type collision tuned mass damper applied to fan and design method | |
| CN100587293C (en) | Vibration damping method of large-scale bulb through-flow pump room | |
| Liu et al. | Vibration reduction strategy for wind turbine based on individual pitch control and torque damping control | |
| CN207049526U (en) | A kind of water conservancy water pump mounting seat | |
| CN203498877U (en) | Vibration damping device | |
| CN207229656U (en) | A kind of damping frame and the motor using the damping frame | |
| Peeters et al. | Structural analysis of a wind turbine and its drive train using the flexible multibody simulation technique | |
| CN107644112A (en) | The improvement control strategy that a kind of double-fed wind power generator shafting concussion suppresses | |
| CN109931361B (en) | Large-scale fan assembled is along with adjustable high-efficient spring damping vibration damper of shape | |
| CN205065191U (en) | Fan damping pedestal | |
| CN102042228B (en) | Dynamic balance design method of DC (Direct Current) variable-frequency rotary refrigeration compressor | |
| CN112228406A (en) | Shock absorption foundation of control rod driving mechanism fan | |
| CN113239486B (en) | Double wind wheel fan transmission system resonance prediction method based on dynamics analysis | |
| CN104657543A (en) | Model selecting method for elastic support of wind power gear box | |
| CN212850106U (en) | Generator with prevent rocking |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |