CN105526197A - Noise reduction and oil filtering device of centrifugal fan - Google Patents

Noise reduction and oil filtering device of centrifugal fan Download PDF

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Publication number
CN105526197A
CN105526197A CN201510991010.0A CN201510991010A CN105526197A CN 105526197 A CN105526197 A CN 105526197A CN 201510991010 A CN201510991010 A CN 201510991010A CN 105526197 A CN105526197 A CN 105526197A
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CN
China
Prior art keywords
cylinder body
outer cylinder
inner barrel
noise reduction
centrifugal blower
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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.)
Granted
Application number
CN201510991010.0A
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Chinese (zh)
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CN105526197B (en
Inventor
叶丰
何立博
宁国立
李志峰
茅忠群
诸永定
申志贤
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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Priority to CN201510991010.0A priority Critical patent/CN105526197B/en
Publication of CN105526197A publication Critical patent/CN105526197A/en
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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
    • 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • 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)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention relates to a noise reduction and oil filtering device of a centrifugal fan. The noise reduction and oil filtering device is characterized by comprising an outer barrel and an inner barrel which are arranged at an air inlet of the centrifugal fan, both the outer barrel and the inner barrel forwards extend out of the front wall of a volute, and an annular channel is formed between the outer barrel and the inner barrel; annular walls of the outer barrel and the inner barrel are each provided with a plurality of small holes, so that the annular walls of the outer barrel and the inner barrel at least form mesh structures partially. According to the noise reduction and oil filtering device, the annular walls of the outer barrel and the inner barrel are provided with the small holes, the annular channel is formed between the outer barrel and the inner barrel, airflow at the air inlet can be converted into small-scale vortexes through the small holes, and a large amount of sound energy is consumed away through vibration in the annular channel; and meanwhile, a large amount of sound energy is consumed away in the vibration propagation process of sound waves between the annular walls of the annular channel, and therefore the noise reduction is accordingly improved. In addition, the probability of collision between particles in fluid and the hole walls is increased through the small holes, the particles in the fluid are further thrown to the wall faces of the annular channel through centrifugal force of the fluid during bending, and therefore the filtering effect is strengthened.

Description

A kind of noise reduction of centrifugal blower, oil filter
Technical field
The present invention relates to a kind of centrifugal blower, especially relate to a kind of noise reduction of centrifugal blower, oil filter.
Background technique
The hush pipe of existing centrifugal blower is generally that inner barrel sleeve is in outer cylinder body, and at the two ends sleeve baffle plate of inner barrel, by baffle plate, inner barrel and outer cylinder body are welded and fixed, and filling glass is cotton between inner barrel and outer cylinder body, the hush pipe function of this structure is comparatively single, only plays the effect of noise reduction.Also the centrifugal blower of similar band noise-reducing structure is disclosed in prior art, if the patent No. is " a kind of modified model centrifugal blower " disclosed in the Chinese utility model patent of ZL201520234680.3 (Authorization Notice No. is CN204532914U), this centrifugal blower is by adopting damping base, stable and noise is low when can ensure fan operation, simultaneously, its reducing cylinder has connected soft cylinder, it is made conveniently to be connected with gas outlet, simultaneously, its baffler is fixed together with inner barrel sleeve by outer cylinder body, structure is simple, be connected firmly, and its inner barrel is plugged with frustoconic shape cylinder, first by the noise reduction of frustoconic shape cylinder when making its wind enter ventilator by outer end, again through inner barrel noise reduction.Although this follow-on centrifugal blower, by after dual noise reduction, can obtain better erasure effect, and this noise-reducing structure also only achieves erasure effect, and function is comparatively single.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned prior art present situation, provides a kind of structure is simple, can realize the centrifugal blower of noise reduction and oil filtering function simultaneously noise reduction, oil filter.
The present invention solves the problems of the technologies described above adopted technological scheme: the noise reduction of this centrifugal blower, oil filter, it is characterized in that: comprise the outer cylinder body and inner barrel of being located at air inlet of centrifugal fan, described outer cylinder body and inner barrel stretch out in all forward the spiral case antetheca of centrifugal blower, annular pass is formed between described outer cylinder body and inner barrel, the annular wall of outer cylinder body and inner barrel has multiple aperture, make the annular wall of outer cylinder body and inner barrel at least in local in mesh-structured.
Outer cylinder body can have multiple mounting structure, preferably, is provided with intake grill circle at air inlet of centrifugal fan, and the rear end of described outer cylinder body is arranged on intake grill circle, and the barrel dliameter of outer cylinder body and intake grill circle suitable.
Inner barrel can have multiple mounting structure, and preferably, the front end of described inner barrel stretches out in forward described outer cylinder body and is arranged on front cover plate of fan, and the rear end of described inner barrel stretches out in described outer cylinder body backward.
Outer cylinder body and inner barrel can have various structures and size relationship, and preferably, described outer cylinder body and inner barrel are cylinder, the diameter D of described outer cylinder body 1with the diameter D of inner barrel 2between pass be:
Further preferably, the diameter D of described outer cylinder body 1=150 ~ 300mm.
Further preferably, described inner barrel stretches out in forward the distance L of spiral case antetheca 1the distance L of spiral case antetheca is stretched out in forward with described outer cylinder body 2between pass be:
In order to improve noise reduction and oil strain effect, all have described aperture in the whole annular wall of described outer cylinder body and inner barrel, the aperture d=1.0 ~ 3.0mm of described aperture, and percent opening is 70% ~ 90%.
Can be collected in inner barrel and outer cylinder body to make the oil droplet filtered through inner barrel and outer cylinder body, preferably, described aperture to be only opened in bottom described outer cylinder body and inner barrel in above annular wall, and central angle corresponding to the arc length at the atresia position, bottom of outer cylinder body and inner barrel is 60-150 °.Like this, the bottom of inner barrel and outer cylinder body is equivalent to constitute oil-collecting region, and the part oil droplet on inner barrel and outer cylinder body can drop in this oil-collecting region.
Can be collected in the swab case below spiral case to make the oil droplet filtered through inner barrel and outer cylinder body, described outer cylinder body and inner barrel all tilt from front to back obliquely, bottom the spiral case of centrifugal blower, have oil leaking hole, be provided with swab case in the below of described oil leaking hole.
Further preferably, the front end of described swab case formed stretch out in forward described outer cylinder body connect oily tongue.Like this, the part oil droplet on outer cylinder body and inner barrel flows in swab case after falling into and connecing oily tongue more backward.
Compared with prior art, the invention has the advantages that: this device has aperture in the annular wall of inner barrel and outer cylinder body, and form annular pass between inner barrel and outer cylinder body, intake grill air-flow can be converted into small scale whirlpool by aperture, and vibration consumes a large amount of acoustic energy in annular pass, simultaneously sound wave vibrates in propagation process and consumes a large amount of acoustic energy between the ring wall surface of annular pass, thus obtains good erasure effect; In addition, fluid is in the process flowing through annular pass and aperture, and aperture increases the probability of collision in fluid between particle and hole wall, and the particle in fluid is got rid of the wall to annular pass by the fluid centrifugal force when bending further simultaneously, thus strengthens filtering effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one;
Fig. 2 is the structural representation (front cover plate of fan is housed) of another angle of the embodiment of the present invention one;
Fig. 3 is the structure sectional view of the embodiment of the present invention one;
Fig. 4 is the structural representation of the embodiment of the present invention two.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
Embodiment one:
As shown in Figure 1 to Figure 3, the noise reduction of the centrifugal blower in the present embodiment, oil filter comprise the outer cylinder body 1 and inner barrel 2 of being located at air inlet, outer cylinder body 1 and inner barrel 2 stretch out in all forward spiral case antetheca 6, annular pass 3 is formed between outer cylinder body 1 and inner barrel 2, the whole annular wall of outer cylinder body and inner barrel is full of aperture 4, and the whole annular wall making outer cylinder body and inner barrel is mesh-structured.
In the present embodiment, at air inlet, circular intake grill circle 5 is installed, correspondingly, outer cylinder body 1 be cylinder and size and intake grill circle 5 suitable, the rear end of outer cylinder body 1 can be fixed by welding on intake grill circle 5.Inner barrel 2 is also cylinder, and the front end of inner barrel 2 stretches out in forward outer cylinder body 1 and is fixed on front cover plate of fan 7, and the rear end of inner barrel 2 stretches out in outer cylinder body 1 backward, and namely inner barrel 2 stretches into blower interior backward.
Position relationship between before and after outer cylinder body 1 and inner barrel 2 is: set inner barrel 2 to stretch out in forward the distance of spiral case antetheca 6 as L 1, in the present embodiment, L 1be the distance between the spiral case antetheca 6 of blower fan and front cover plate of fan 7, if the distance that outer cylinder body 1 stretches out in forward spiral case antetheca 6 is L 2, then L 1with L 2between pass be:
In the present embodiment, outer cylinder body 1 and inner barrel 2 are cylinder, if the diameter of outer cylinder body 1 is D 1, the diameter of inner barrel 2 is D 2, then D 1with D 2between pass be: for different centrifugal blowers, D 1and D 2numerical value have nothing in common with each other, the diameter D of outer cylinder body 1 1determined by the diameter of intake grill circle 5, due to the size restrictions of cooking-fume exhauster blower impeller, routinely, the diameter D of outer cylinder body 1 1=150 ~ 300mm.In addition, in order to obtain best noise reduction and oil strain effect, the aperture d=1.0 ~ 3.0mm of aperture 4, percent opening is 70% ~ 90%.
In the present embodiment, outer cylinder body 1 and inner barrel 2 are horizontally disposed with all from front to back, and namely the axis parallel of outer cylinder body 1 and inner barrel 2 is in the air intake direction of intake grill.In addition, for the ease of oil-collecting, outer cylinder body 1 and inner barrel 2 can also all tilt from front to back obliquely.Bottom the spiral case of centrifugal blower, have oil leaking hole 8, be provided with swab case 9 in the below of oil leaking hole 8, and, the front end of swab case 9 formed stretch out in forward outer cylinder body 1 connect oily tongue 91.During blower fan work, the spiral case that the most of oil droplet filtered through outer cylinder body 1 and inner barrel 2 drops onto blower fan is backward inner, and flowing in swab case 9 by oil leaking hole 8, small part oil droplet directly drops onto and connects on oily tongue 91 outside blower fan, and and then flows into backward in swab case 9.
The noise reduction principle of this noise reduction, filtrating equipment is as follows:
1), air-flow is converted into small scale whirlpool by aperture, and in annular chamber, vibration consumes a large amount of acoustic energy;
2), sound wave vibrates in propagation process and consumes a large amount of acoustic energy between ring wall surface.
Through-flow and the work principle of filter of this noise reduction, filtrating equipment is as follows:
1), aperture increases the probability of collision in fluid between particle and hole wall;
2), simultaneously the centrifugal force of fluid when bending further the particle in fluid is got rid of to wall, strengthen filtering effect.
Embodiment two:
As shown in Figure 4, in the present embodiment, aperture 4 to be only opened in bottom outer cylinder body 1 and inner barrel 2 in above annular wall, makes the local of the annular wall of outer cylinder body 1 and inner barrel 2 be mesh-structured, and central angle corresponding to the arc length at the atresia position, bottom of outer cylinder body 1 and inner barrel 2 is 60-150 °.Like this, oil-collecting region 10 can be formed on the bottom of outer cylinder body 1 and inner barrel 2, and the part oil droplet on outer cylinder body 1 and inner barrel 2 ring wall can drop onto in this oil-collecting region 10.
The foregoing is only the preferred embodiment of the present invention; it should be pointed out that for those of ordinary skills, do not departing under principle prerequisite of the present invention; can carry out multiple remodeling or improvement to the present invention, these are all regarded as within protection scope of the present invention.

Claims (10)

1. the noise reduction of a centrifugal blower, oil filter, it is characterized in that: comprise the outer cylinder body (1) and inner barrel (2) of being located at air inlet of centrifugal fan, described outer cylinder body (1) and inner barrel (2) stretch out in all forward the spiral case antetheca (6) of centrifugal blower, annular pass (3) is formed between described outer cylinder body (1) and inner barrel (2), the annular wall of described outer cylinder body (1) and inner barrel (2) has multiple aperture (4), the annular wall of outer cylinder body (1) and inner barrel (2) is made to be at least locally mesh-structured.
2. the noise reduction of centrifugal blower according to claim 1, oil filter, it is characterized in that: at air inlet of centrifugal fan, intake grill circle (5) is installed, the rear end of described outer cylinder body (1) is arranged on intake grill circle (5), and the barrel dliameter of outer cylinder body (1) and intake grill circle (5) suitable.
3. the noise reduction of centrifugal blower according to claim 1, oil filter, it is characterized in that: the front end of described inner barrel (2) stretches out in forward described outer cylinder body (1) and is arranged on front cover plate of fan (7), the rear end of described inner barrel (2) stretches out in described outer cylinder body (1) backward.
4. the noise reduction of centrifugal blower according to claim 1, oil filter, is characterized in that: described outer cylinder body (1) and inner barrel (2) are cylinder, the diameter D of described outer cylinder body (1) 1with the diameter D of inner barrel (2) 2between pass be:
1 3 D 1 ≤ D 2 ≤ 2 3 D 1 .
5. the noise reduction of centrifugal blower according to claim 4, oil filter, is characterized in that: the diameter D of described outer cylinder body (1) 1=150 ~ 300mm.
6. the noise reduction of centrifugal blower according to claim 1, oil filter, is characterized in that: described inner barrel (2) stretches out in forward the distance L of spiral case antetheca (6) 1the distance L of spiral case antetheca (6) is stretched out in forward with described outer cylinder body (1) 2between pass be: 1 3 L 1 ≤ L 2 ≤ 2 3 L 1 .
7. the noise reduction of centrifugal blower according to claim 1, oil filter, it is characterized in that: all have described aperture (4) in the whole annular wall of described outer cylinder body (1) and inner barrel (2), aperture d=1.0 ~ the 3.0mm of described aperture (4), and percent opening is 70% ~ 90%.
8. the noise reduction of centrifugal blower according to claim 1, oil filter, it is characterized in that: described aperture (4) is only opened in the above annular wall of described outer cylinder body (1) and inner barrel (2) bottom, and central angle corresponding to the arc length at the atresia position, bottom of outer cylinder body (1) and inner barrel (2) is 60-150 °.
9. the noise reduction of the centrifugal blower according to claim arbitrary in claim 1 to 8, oil filter, it is characterized in that: described outer cylinder body (1) and inner barrel (2) all tilt from front to back obliquely, bottom the spiral case of centrifugal blower, have oil leaking hole (8), be provided with swab case (9) in the below of described oil leaking hole (8).
10. the noise reduction of centrifugal blower according to claim 9, oil filter, is characterized in that: the front end of described swab case (9) formed stretch out in forward described outer cylinder body (1) connect oily tongue (91).
CN201510991010.0A 2015-12-24 2015-12-24 A kind of noise reduction of centrifugal blower, oil-filtering apparatus Active CN105526197B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640763A (en) * 2016-10-20 2017-05-10 宁波方太厨具有限公司 Air inlet ring and centrifugal fan comprising same
CN106881011A (en) * 2017-01-18 2017-06-23 合肥杰通环境技术有限公司 A kind of compound smoke hood type lampblack purifying system

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Publication number Priority date Publication date Assignee Title
CN101535656A (en) * 2006-11-02 2009-09-16 松下电器产业株式会社 Centrifugal fan
CN101714353A (en) * 2008-10-01 2010-05-26 通用电气公司 Sound attenuation systems
CN102518605A (en) * 2005-02-23 2012-06-27 康明斯涡轮增压技术有限公司 Compressor
JP3191383U (en) * 2014-04-09 2014-06-19 陳玉沛 Sound absorber for fan
CN104180412A (en) * 2014-08-09 2014-12-03 华帝股份有限公司 Smoke absorbing and noise reducing device of range hood
CN204532984U (en) * 2015-04-17 2015-08-05 浙江风神风机制造有限公司 A kind of centrifugal fan baffler
CN104963899A (en) * 2015-07-14 2015-10-07 柳州职业技术学院 Silencer of draught fan
CN104990239A (en) * 2015-05-20 2015-10-21 西安建筑科技大学 Annular uniform cross-section flow equalizing apparatus for cylinder wall-attached air supply
CN205260437U (en) * 2015-12-24 2016-05-25 宁波方太厨具有限公司 Centrifugal fan's amortization, oil filter device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102518605A (en) * 2005-02-23 2012-06-27 康明斯涡轮增压技术有限公司 Compressor
CN101535656A (en) * 2006-11-02 2009-09-16 松下电器产业株式会社 Centrifugal fan
CN101714353A (en) * 2008-10-01 2010-05-26 通用电气公司 Sound attenuation systems
JP3191383U (en) * 2014-04-09 2014-06-19 陳玉沛 Sound absorber for fan
CN104180412A (en) * 2014-08-09 2014-12-03 华帝股份有限公司 Smoke absorbing and noise reducing device of range hood
CN204532984U (en) * 2015-04-17 2015-08-05 浙江风神风机制造有限公司 A kind of centrifugal fan baffler
CN104990239A (en) * 2015-05-20 2015-10-21 西安建筑科技大学 Annular uniform cross-section flow equalizing apparatus for cylinder wall-attached air supply
CN104963899A (en) * 2015-07-14 2015-10-07 柳州职业技术学院 Silencer of draught fan
CN205260437U (en) * 2015-12-24 2016-05-25 宁波方太厨具有限公司 Centrifugal fan's amortization, oil filter device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640763A (en) * 2016-10-20 2017-05-10 宁波方太厨具有限公司 Air inlet ring and centrifugal fan comprising same
CN106881011A (en) * 2017-01-18 2017-06-23 合肥杰通环境技术有限公司 A kind of compound smoke hood type lampblack purifying system

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