CN203717463U - Energy-efficient low-noise outer-rotor centrifugal fan - Google Patents
Energy-efficient low-noise outer-rotor centrifugal fan Download PDFInfo
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- CN203717463U CN203717463U CN201420041052.9U CN201420041052U CN203717463U CN 203717463 U CN203717463 U CN 203717463U CN 201420041052 U CN201420041052 U CN 201420041052U CN 203717463 U CN203717463 U CN 203717463U
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Abstract
The utility model relates to the field of fan manufacturing, in particular to an energy-efficient low-noise outer-rotor centrifugal fan. The energy-efficient low-noise outer-rotor centrifugal fan comprises a fan volute, an impeller, a motor and an air outlet formed in the fan volute. A noise reduction interference device is connected to a position of the air outlet and comprises a straight channel, a bending channel and a converging outlet. One end of the straight channel and one end of the bending channel are mutually converged to be connected with the air outlet while the other ends are converged to form the converged outlet. The length difference between the straight channel and the bending channel is equal to odd number times of a half of the noise wavelength. According to the principle of sound wave interference, main frequency which is the most strongest in the fan noise spectrum can be subjected to dramatic noise reduction, and low-noise operation can be achieved; the energy-efficient low-noise outer-rotor centrifugal fan is simple in structure, low in manufacturing cost and promotable.
Description
Technical field
The utility model relates to blower fan and manufactures field, relates in particular to the energy-efficient low-noise centrifugal fan of external rotor.
Background technique
Outer-rotor centrifugal fan is a kind of mechanical energy that relies on input, improves supply gas the side by side machinery of body of gas pressure, is widely used in ventilation, dust discharge and the field such as cooling of factory, mine, tunnel, cooling tower, vehicle, boats and ships and building.But a lot of users are reflected outer-rotor centrifugal fan, the noise that impeller produces when operation is larger, sometimes can have a strong impact on people's productive life, bring very large inconvenience to people's life, so impeller noise problem is the problem that must pay attention in outer-rotor centrifugal fan design process.Common method is that impeller blade is designed to swept-back twisted blade, avoids γ-ray emission eddy current, thereby reduces the noise that centrifugal blower produces.Although this method makes the anti-acoustic capability of blower fan obtain certain lifting, cannot eliminate for the noise having produced.
Model utility content
Technical problem to be solved in the utility model is to overcome the problems referred to above, and provides a kind of external rotor energy-efficient low-noise centrifugal fan.
The technical solution of the utility model is:
The energy-efficient low-noise centrifugal fan of external rotor, comprise volute of blower, impeller, motor and be arranged on the exhaust outlet on volute of blower, it is characterized in that: described exhaust outlet place is connected with an interference noise reducing device, described interference noise reducing device comprises that a straight passage, bent passage and one converge outlet; Described straight passage mutually converges with exhaust outlet and is connected with bent passage one end, and the other end merges into a road formation and converges outlet; The difference of described straight passage and bent passage length equals half odd-multiple of noise wavelength.
The cross section of described bent passage is circular arc.
The cross section of described bent passage is V-arrangement.
On the inwall of described interference noise reducing device, covered acoustical cotton.
Between described interference noise reducing device and exhaust outlet, adopt and removably connect.
The beneficial effects of the utility model are: the utility model carries out significantly noise reduction for the main frequency of intensity maximum in fan noise frequency spectrum, realize low noise operation; And simple in structure, cheap for manufacturing cost, there is replicability.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view that the energy-efficient low-noise centrifugal fan of external rotor adopts circular arc bent passage.
Fig. 2 is the partial sectional view that the energy-efficient low-noise centrifugal fan of external rotor adopts circular arc bent passage.
Fig. 3 is the partial sectional view that the energy-efficient low-noise centrifugal fan of external rotor adopts V-arrangement bent passage.
Embodiment
Now by reference to the accompanying drawings the utility model is further described:
As shown in Figure 1 and Figure 2, the present embodiment is the energy-efficient low-noise centrifugal fan of a kind of external rotor, and it mainly includes volute of blower 1, impeller, motor and is arranged on the exhaust outlet 6 on volute of blower 1.Described exhaust outlet 6 places are connected with an interference noise reducing device 2, and described interference noise reducing device 2 comprises that a straight passage 3, bent passage 4 and one converge outlet 5.Described straight passage 3 mutually converges with exhaust outlet 6 and is connected with bent passage 4 one end, and the other end merges into a road, forms and converges outlet 5.In other words, exhaust outlet 6 places are branched into a straight passage 3 and a bent passage 4, and straight passage 3 and bent passage 4 merge into a road mutually at the other end, form and converge outlet 5.The difference of described straight passage 3 and bent passage 4 length equals half odd-multiple of noise wavelength.
The principle of the present embodiment is: sound wave has mutual interference capability in transmitting procedure, and two sound waves that row frequency is identical, direction of vibration is identical, phase difference is fixing mutually stack can interfere phenomenon.If both phase places are identical,, after two train wave stacks, overall amplitude increases, and acoustic pressure is strengthened.Otherwise if both single spin-echos,, after two train wave stacks, overall amplitude reduces, acoustic pressure weakens, and if unanimously counteracting completely of the amplitude of two train waves.
The noise that outer-rotor centrifugal fan produces in running concentrates in certain frequency range, finds and in noise spectrum, affects the main frequency of noise intensity as interference noise reducing main frequency, can realize the object of noise reduction.The present embodiment is based on above principle, and the difference of the length of straight passage 3 and bent passage 4 is designed to half odd-multiple of noise wavelength, makes the two row noise waves phase places of transmission in straight passage 3 and bent passage 4 just the opposite.When centrifugal blower is during in normal working, interference noise reducing device 2 is separated into two-way by the noise that arrives exhaust outlet 6 places, enters into respectively in straight passage 3 and bent passage 4.And the point that reaches straight passage 3 and bent passage 4 when noise enters while converging outlet 5, the principle that satisfied interference disappears mutually, makes to arrive and converges the noise that exports 5 places and cancelled out each other.
As preferentially, the cross section of described bent passage 4 is circular arc.
As preferentially, the cross section of described bent passage 4 is V-arrangement.
The bent passage 4 that adopts above-mentioned two kinds of shapes is because these two kinds of shape and structures are simple, is convenient to processing.
As preferentially, on the inwall of described interference noise reducing device 2, covered acoustical cotton, this can play further absorbing sound and lowering noise for the noise that enters interference noise reducing device 2 inside.
As preferentially, between described interference noise reducing device 2 and exhaust outlet 6, adopt and removably connect, this is because the noise spectrum scope of different draught fan impeller generations is different, main frequency as interference noise reducing also will change thereupon, so the Design of length of straight passage 3 and bent passage 4 also can be different.Adopt removably to connect and can so that interference noise reducing device 2 is mated to replacing, make every effort to best noise reduction.
Claims (5)
1. the energy-efficient low-noise centrifugal fan of external rotor, comprise volute of blower, impeller, motor and be arranged on the exhaust outlet on volute of blower, it is characterized in that: described exhaust outlet place is connected with an interference noise reducing device, described interference noise reducing device comprises that a straight passage, bent passage and one converge outlet; Described straight passage mutually converges with exhaust outlet and is connected with bent passage one end, and the other end merges into a road formation and converges outlet; The difference of described straight passage and bent passage length equals half odd-multiple of noise wavelength.
2. according to the energy-efficient low-noise centrifugal fan of external rotor claimed in claim 1, it is characterized in that: the cross section of described bent passage is circular arc.
3. according to the energy-efficient low-noise centrifugal fan of external rotor claimed in claim 1, it is characterized in that: the cross section of described bent passage is V-arrangement.
4. according to the energy-efficient low-noise centrifugal fan of external rotor claimed in claim 1, it is characterized in that: on the inwall of described interference noise reducing device, covered acoustical cotton.
5. according to the energy-efficient low-noise centrifugal fan of external rotor claimed in claim 1, it is characterized in that: between described interference noise reducing device and exhaust outlet, adopt and removably connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420041052.9U CN203717463U (en) | 2014-01-23 | 2014-01-23 | Energy-efficient low-noise outer-rotor centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420041052.9U CN203717463U (en) | 2014-01-23 | 2014-01-23 | Energy-efficient low-noise outer-rotor centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203717463U true CN203717463U (en) | 2014-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420041052.9U Expired - Fee Related CN203717463U (en) | 2014-01-23 | 2014-01-23 | Energy-efficient low-noise outer-rotor centrifugal fan |
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| CN (1) | CN203717463U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631106A (en) * | 2017-08-24 | 2018-01-26 | 江西泰豪军工集团有限公司 | Discharge duct and its sound reduction method |
| CN109373395A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of casing of kitchen ventilator and kitchen ventilator with noise interference device |
| CN109373397A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe of band self-regulation noise interference device |
| CN109373402A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe of the embedded noise interference device of band |
| CN109373396A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with noise interference device |
| CN109780603A (en) * | 2018-11-27 | 2019-05-21 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device |
| CN111426045A (en) * | 2020-02-28 | 2020-07-17 | 青岛海尔空调电子有限公司 | Noise reduction air duct assembly for air duct machine and design method thereof |
-
2014
- 2014-01-23 CN CN201420041052.9U patent/CN203717463U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631106A (en) * | 2017-08-24 | 2018-01-26 | 江西泰豪军工集团有限公司 | Discharge duct and its sound reduction method |
| CN109373395A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of casing of kitchen ventilator and kitchen ventilator with noise interference device |
| CN109373397A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe of band self-regulation noise interference device |
| CN109373402A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe of the embedded noise interference device of band |
| CN109373396A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with noise interference device |
| CN109780603A (en) * | 2018-11-27 | 2019-05-21 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device |
| CN111426045A (en) * | 2020-02-28 | 2020-07-17 | 青岛海尔空调电子有限公司 | Noise reduction air duct assembly for air duct machine and design method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20170123 |
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| CF01 | Termination of patent right due to non-payment of annual fee |