CN111293821A - Ventilation and noise reduction device for air-cooled motor - Google Patents
Ventilation and noise reduction device for air-cooled motor Download PDFInfo
- Publication number
- CN111293821A CN111293821A CN201911366667.2A CN201911366667A CN111293821A CN 111293821 A CN111293821 A CN 111293821A CN 201911366667 A CN201911366667 A CN 201911366667A CN 111293821 A CN111293821 A CN 111293821A
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- CN
- China
- Prior art keywords
- air
- motor
- silencer
- outlet
- ventilation
- 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
- 238000009423 ventilation Methods 0.000 title claims abstract description 26
- 230000003584 silencer Effects 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 239000011358 absorbing material Substances 0.000 claims abstract description 7
- 229920000742 Cotton Polymers 0.000 claims description 9
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 9
- 239000011496 polyurethane foam Substances 0.000 claims description 9
- 230000030279 gene silencing Effects 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
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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
- F04D29/66—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
-
- 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
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
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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
- F04D29/66—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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/12—Machines characterised by means for reducing windage losses or windage noise
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a ventilation and noise reduction device of an air-cooled motor, which comprises an inlet silencer and an outlet silencer, wherein the inlet silencer is of a cylindrical structure horizontally arranged with a motor air inlet and is divided into an outer cylinder and an inner cylinder, the upper side wall and the lower side wall of the outer cylinder are respectively provided with an air inlet, two ends of the inner cylinder are open, one end of the inner cylinder is connected with the open end of the outer cylinder through a baffle plate, the other end of the inner cylinder faces the closed end of the outer cylinder, the length of the inner cylinder is smaller than that of the outer cylinder, and sound absorption materials are attached to the inner side walls of; the outlet silencer is a cylindrical structure which is horizontally arranged and connected with the air outlet of the motor, the upper side wall and the lower side wall of the outlet silencer are respectively provided with an air outlet, and sound absorbing materials are attached to the inner side wall of the outlet silencer. The motor cooling device can effectively reduce the ventilation noise of the motor on the premise of not reducing the air volume of the external air duct and meeting the requirement of cooling the motor.
Description
Technical Field
The invention relates to a ventilation and noise reduction device for an air cooling motor, which is used in the field of motor noise reduction.
Background
For the ventilation and heat dissipation structure of the air-air cooling motor, heat generated by internal elements such as a motor stator is circularly carried to a cooler (also called a heat exchanger) at the upper part of the motor through an internal air path of the motor, is exchanged to an external air path of the motor through the cooler, and is diffused to the environment outside the motor through the external air path of the motor so as to keep the heat balance of the motor within a certain temperature range stable and keep the motor capable of continuously running, and power required by the internal and external air paths of the motor is provided by a fan arranged on a rotating shaft of the motor.
This cooling mode creates ventilation noise, which mainly includes rotational noise of the fan outside the motor and eddy noise in the air duct. With the progress of the times, the requirement for reducing the noise of the motor is higher and higher, and at present, the noise of the motor required by customers generally cannot exceed the sound pressure level of 85dB (A). In general, rotational noise is proportional to the speed of the motor's outer fan to the tenth power, and eddy current noise is proportional to the speed of the motor's outer fan to the fifth or sixth power. Conventionally, to reduce the ventilation noise of the motor, the diameter of the fan outside the motor is usually reduced, but reducing the diameter of the fan outside the motor reduces the air volume of the air duct outside the motor, reduces the cooling effect of the motor, and causes the temperature of the motor to rise. With the development of motor technology, motors are developed in the direction of small size, high power and high load, so that the noise reduction in the form of reducing the diameter of an outer fan of the motor has great limitation, the noise of the motor often exceeds the standard, the requirements of users cannot be met, and a method for reducing the noise of the motor without reducing the air volume of an outer air duct is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a ventilation and noise reduction device for an air cooling motor, which can effectively reduce the ventilation noise of the motor on the premise of not reducing the air volume of an external air duct and meeting the requirement of cooling the motor.
One technical scheme for achieving the above purpose is as follows: a ventilation silencing device for an air-cooling motor comprises an inlet silencer and an outlet silencer;
the inlet silencer is of a horizontally arranged cylindrical structure connected with an air inlet of the motor and is divided into an outer cylinder and an inner cylinder, an air inlet is formed in the upper side wall and the lower side wall of the outer cylinder respectively, two ends of the inner cylinder are open, one end of the inner cylinder is connected with the open end of the outer cylinder through a baffle plate, the other end of the inner cylinder faces the closed end of the outer cylinder, and sound-absorbing materials are attached to the inner side walls of the outer cylinder and the inner cylinder;
the outlet silencer is a cylindrical structure which is horizontally arranged and connected with the air outlet of the motor, an air outlet is respectively formed in the upper side wall and the lower side wall of the outlet silencer, and sound absorbing materials are attached to the inner side wall of the outlet silencer.
Furthermore, a drainage port matched with the air inlet of the motor is arranged at the port of the inner barrel facing the motor.
Furthermore, detachable dustproof gauze is arranged on the air outlet, the air inlet and the port of the inner cylinder facing the outer cylinder.
Further, the sound-absorbing material is polyurethane foam sound-absorbing cotton.
Still further, the thickness of the polyurethane foam sound absorption cotton is 30 mm.
Further, the inlet silencer is of a cylindrical structure, and the outlet silencer is of a square cylindrical structure.
Compared with the external air path of a common air cooling motor, the ventilation silencer device for the air cooling motor is additionally provided with the inlet silencer and the outlet silencer, and the ventilation noise at the inlet end of the external air path of the motor is effectively reduced by prolonging the path length of air flow and the path length of outward propagation of rotating noise of an external fan, enabling the air path and the noise to be subjected to multiple steering attenuation and matching with the energy absorption of polyurethane foam sound-absorbing cotton. The invention can effectively reduce the ventilation noise of the motor without reducing the air volume of the external air duct of the motor.
Drawings
Fig. 1 is a schematic structural view of a ventilation and noise reduction device of an air cooling motor, which is provided by the invention, mounted on the motor;
fig. 2 is a schematic structural view of an inlet silencer of the ventilation silencer for the air cooling motor of the present invention;
fig. 3 is a schematic structural view of an outlet silencer of the ventilation silencer for the air cooling motor of the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
referring to fig. 1, an air-cooling motor employing the ventilation and noise reduction device of the air-cooling motor of the present invention is shown. It comprises an inlet muffler 6 and an outlet muffler 7 arranged on the motor. The air inlet end of the motor is provided with an outer fan 4, an end cover 5 is sleeved outside the outer fan 4, airflow is pressurized by the outer fan through an inlet silencer 6 and sent into an air guide cylinder 3 to enter an air-air cooler 2 for cooling, then the motor stator 1 is cooled, then the airflow flows back to an air outlet shaft of the air-air cooler 2, and the airflow is discharged outwards through an outlet silencer 7.
Referring to fig. 2, the inlet muffler 6 is horizontally disposed in a cylindrical structure connected to the motor air inlet, and is divided into an outer cylinder 61 and an inner cylinder 62, and an air inlet 63 is respectively formed on an upper side wall and a lower side wall of the outer cylinder 61. In order to ensure the cooling effect, the air inlet amount is made as large as possible, and the surface area of the air inlet 63 is made as large as possible, so that the outer cylinder 61 and the inner cylinder 62 of the inlet muffler 6 have a cylindrical structure. The two ends of the inner cylinder 62 are open, one end of the inner cylinder 62 is connected with the open end of the outer cylinder 61 through a baffle plate 64, the other end of the inner cylinder 62 faces the closed end of the outer cylinder, and the length of the inner cylinder 62 is smaller than that of the outer cylinder 61. Polyurethane foam sound-absorbing cotton 66 having a thickness of 30mm is attached to the inner side walls of the outer cylinder 61 and the inner cylinder 62. The end of the inner barrel 62 facing the motor is provided with a drainage port 65 matching with the motor air inlet. When the outer fan 4 is turned on, the airflow enters the outer cylinder 61 from the upper and lower directions through the air inlet 63 in the radial direction, then flows to the end of the inlet silencer 6 in the axial direction, flows in the radial direction under the blockage of the closed end of the inlet silencer 6, then flows in the axial direction under the pressurization of the outer fan 4, and flows into the cooling system through the inner cylinder 62 and the drainage port 65. The structure prolongs the path length of the outward propagation of the rotating noise of the outer fan, the turning refraction attenuation of the air flow and the noise through the axial movement and the radial movement, and the energy absorption of the polyurethane foam sound-absorbing cotton effectively reduces the ventilation noise at the inlet end of the outer wind path of the motor.
Referring to fig. 3, the outlet silencer 7 is a horizontally disposed cylindrical structure connected to the motor air outlet, the upper side wall and the lower side wall of the outlet silencer 7 are respectively provided with an air outlet 71, and the inner side wall of the outlet silencer is attached with polyurethane foam sound-absorbing cotton 72 with a thickness of 30 mm. In order to ensure the controllable direction of the outlet air flow and facilitate the connection with a subsequent air circulation system or an air purification system, and meanwhile, in order to prevent production accidents, the outlet silencer 7 is of a square tube structure, and the outlet air flow direction of the air outlet 71 on any side surface is fixed. After the airflow of the air outlet shaft of the cooling pipe in the motor cooler is blown into the silencer, the airflow is turned by 90 degrees by the bottom plate of the outlet silencer 7 and is discharged into the environment around the motor upwards and downwards. This structure has prolonged the outside path length who spreads of wind channel vortex noise for noise and air current turn to the decay through once refracting, and the cotton energy absorption is inhaled to polyurethane foam in addition, the effectual ventilation noise that has reduced the outer wind path exit end of motor.
Detachable dustproof gauze is arranged on the air outlet 71, the air inlet 63 and the end of the inner cylinder facing the outer cylinder.
The invention adds the inlet and outlet silencers of an external wind path, performs the structural design of the silencers, and only adds the inlet silencer to reduce the noise of the motor by 3-4 dB (A), only adds the outlet silencer to reduce the noise of the motor by 2-3 dB (A) and simultaneously adds the inlet and outlet silencers to reduce the noise of the motor by 4-6 dB (A) through a plurality of experimental tests and comparative verifications.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides an air-cooled motor ventilation silencing device, includes import muffler and export muffler, its characterized in that:
the inlet silencer is of a horizontally arranged cylindrical structure connected with an air inlet of the motor and is divided into an outer cylinder and an inner cylinder, an air inlet is formed in the upper side wall and the lower side wall of the outer cylinder respectively, two ends of the inner cylinder are open, one end of the inner cylinder is connected with the open end of the outer cylinder through a baffle plate, the other end of the inner cylinder faces the closed end of the outer cylinder, and sound-absorbing materials are attached to the inner side walls of the outer cylinder and the inner cylinder;
the outlet silencer is a cylindrical structure which is horizontally arranged and connected with the air outlet of the motor, an air outlet is respectively formed in the upper side wall and the lower side wall of the outlet silencer, and sound absorbing materials are attached to the inner side wall of the outlet silencer.
2. The ventilation and noise reduction device for the air-cooled motor according to claim 1, wherein a port of the inner cylinder facing the motor is provided with a drainage port matched with an air inlet of the motor.
3. The ventilation and noise reduction device for the air-cooling motor as claimed in claim 1, wherein the air outlet, the air inlet and the end of the inner cylinder facing the outer cylinder are provided with detachable dustproof gauze.
4. The ventilation noise silencer for the air-cooling motor as claimed in claim 1, wherein the sound-absorbing material is polyurethane foam sound-absorbing cotton.
5. The ventilation noise silencer for the air-cooling motor according to claim 4, wherein the thickness of the polyurethane foam sound-absorbing cotton is 30 mm.
6. The ventilation silencer assembly of claim 1, wherein the inlet silencer has a cylindrical structure, and the outlet silencer has a square cylindrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911366667.2A CN111293821A (en) | 2019-12-26 | 2019-12-26 | Ventilation and noise reduction device for air-cooled motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911366667.2A CN111293821A (en) | 2019-12-26 | 2019-12-26 | Ventilation and noise reduction device for air-cooled motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111293821A true CN111293821A (en) | 2020-06-16 |
Family
ID=71022323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911366667.2A Pending CN111293821A (en) | 2019-12-26 | 2019-12-26 | Ventilation and noise reduction device for air-cooled motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111293821A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847786A (en) * | 2019-11-23 | 2020-02-28 | 任宝泉 | Foam metal noise insulation |
| CN113513493A (en) * | 2021-08-18 | 2021-10-19 | 浙江双阳风机有限公司 | Box type exhaust fan |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1507226A (en) * | 1974-07-26 | 1978-04-12 | Piller Kg A | Rotary frequency-changer |
| JPH05344677A (en) * | 1992-06-09 | 1993-12-24 | Mitsubishi Electric Corp | Silencer cover of electric rotating machine |
| CN101512161A (en) * | 2006-08-30 | 2009-08-19 | 科勒公司 | Noise reduction shroud |
| CN203608004U (en) * | 2013-11-12 | 2014-05-21 | 南阳防爆集团股份有限公司 | Motor with noise reduction device |
| CN203608028U (en) * | 2013-11-29 | 2014-05-21 | 南阳防爆集团股份有限公司 | Outer air duct structure of low-noise box-type motor |
| CN108075595A (en) * | 2017-12-19 | 2018-05-25 | 卧龙电气集团股份有限公司 | A kind of late-model inline pump motor special |
| CN109309431A (en) * | 2018-08-21 | 2019-02-05 | 西门子电气传动有限公司 | Air outlet silencer, noise reduction device and motor system for aerodynamic noise in electric motors |
-
2019
- 2019-12-26 CN CN201911366667.2A patent/CN111293821A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1507226A (en) * | 1974-07-26 | 1978-04-12 | Piller Kg A | Rotary frequency-changer |
| JPH05344677A (en) * | 1992-06-09 | 1993-12-24 | Mitsubishi Electric Corp | Silencer cover of electric rotating machine |
| CN101512161A (en) * | 2006-08-30 | 2009-08-19 | 科勒公司 | Noise reduction shroud |
| CN203608004U (en) * | 2013-11-12 | 2014-05-21 | 南阳防爆集团股份有限公司 | Motor with noise reduction device |
| CN203608028U (en) * | 2013-11-29 | 2014-05-21 | 南阳防爆集团股份有限公司 | Outer air duct structure of low-noise box-type motor |
| CN108075595A (en) * | 2017-12-19 | 2018-05-25 | 卧龙电气集团股份有限公司 | A kind of late-model inline pump motor special |
| CN109309431A (en) * | 2018-08-21 | 2019-02-05 | 西门子电气传动有限公司 | Air outlet silencer, noise reduction device and motor system for aerodynamic noise in electric motors |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847786A (en) * | 2019-11-23 | 2020-02-28 | 任宝泉 | Foam metal noise insulation |
| CN110847786B (en) * | 2019-11-23 | 2020-12-04 | 滨州富创科技服务有限公司 | Foam metal noise insulation |
| CN113513493A (en) * | 2021-08-18 | 2021-10-19 | 浙江双阳风机有限公司 | Box type exhaust fan |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200616 |