CN208380857U - A kind of low noise Roots blower - Google Patents
A kind of low noise Roots blower Download PDFInfo
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- CN208380857U CN208380857U CN201820986338.2U CN201820986338U CN208380857U CN 208380857 U CN208380857 U CN 208380857U CN 201820986338 U CN201820986338 U CN 201820986338U CN 208380857 U CN208380857 U CN 208380857U
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Abstract
The utility model relates to a kind of low noise Roots blowers, belong to blower technical field.The low noise Roots blower of the utility model includes casing, wallboard, rotor, synchromesh gear, bearing and fuel tank, it is not crossed in casing close to air outlet and is symmetrically arranged with two groups of backflashes arranged by multiple single backflashes by V-arrangement at rotor center, increase pressure at expulsion variation according to cosine rule in blower exhaust, can be reduced the moment impact of air-flow to reduce noise intensity.Impeller is involute triplicate blade impeller, and Ye Feng and Ye Gu are used to round as a ball arc, and centre is involute, and involute is connected by the cycloid section tangent with circular arc.The process that element volume is communicated with exhaust outlet is changed to gradual change type, reduces flow-reversing impingement intensity and aerodynamic noise by air outlet gradual-enlargement type elliptic design.Under the premise of noise, flow, pressure and other parameters are identical, volume is reduced than existing Roots blower and has saved space, reduce installation confined condition, saved cost, improve benefit.
Description
Technical field
The utility model relates to a kind of low noise Roots blower more particularly to volumetric gas pressure-increasing unit machinery, belong to
Blower technical field.
Background technique
Air blower is a kind of a kind of conventional machinery for the mechanical energy of prime mover being changed into gas energy output, according to work
Principle is divided into vane type and positive displacement two major classes.Roots blower is one kind of classical displacement blower, in 1854 by beauty
The Mark Lewis-Francis of state and Fei Lande Roots brother invent and gain the name therefrom.Roots blower is that there is two-spool gas to increase
Conveying machinery is pressed, is conveyed for gas boosting and gas, structure is simple, compact.Since without interior compression process, thus volume is imitated
Rate is high, working characteristics is stable, manufacture is easy to maintain, does not need internal lubrication, almost unchanged, appearance is vented in using pressure limit
Product is high-efficient, and has the pumped (conveying) medium not characteristics such as oil-containing, therefore be widely used in all fields of national economy, is a kind of
Important industrial gasses convey equipment.
With the continuous development and social progress of modern industry, vibration noise problem increasingly obtains the concern of people,
The vibration noise problem of especially Roots blower is more and more prominent, affects its application.Roots blower noise source
Mainly there is mechanical gentle dynamic two aspect, mechanical noise is mainly generated by factors such as machine driving, structural collision and vibrations.Pneumatically make an uproar
Sound is generated by factors such as gas, turbulence and jet disturbing types, wherein based on being influenced with gas.Roots blower
Main function components are parallel to each other by a pair of intermeshing axis, the impeller that constant speed reversely rotates forms, when blower operating,
The inlet and outlet mouth of air blower is not communicated with, and the conveying of gas is the closed element volume surrounded by impeller and casing and wallboard
It is realized from air inlet to exhaust outlet movement.Therefore, the inlet and outlet mouth two sides of Roots blower are there are pressure difference, gas
Compression is the completion in a flash being connected in element volume with exhaust outlet.When internal gas is transferred to outlet, high pressure gas is exported
Trapped gas in body and rotor rotation process will lead to partial high pressure, and strong aerodynamic force vibration is generated in this process meeting
Moving noise, therefore it is most important to reduce rotor operation process noise.
Fan industry wholeheartedly captures noise difficulty using Roots's machine noise reduction as the most important thing in industry.It is existing
The Roots blower Noise and Vibration Control of technology, common method have two methods of passive noise reduction and active noise reduction.Passive noise reduction
Mainly noise transmission channel is obstructed using sound arrester or sound insulating material, thus increases equipment volume, structure is multiple
It is miscellaneous, and increase manufacture use cost.Active noise reduction is mainly that the mechanism of production of vibration noise is studied from equipment, to rotor knot
Structure, molded lines of rotor, rotor clearance, intake and exhaust pipeline and porting shape carry out system improvement, to eliminate or reduce blower
Noise.For casing internal air return, casing shape, especially casing internal air return, casing shape and air inlet-outlet pipe
The research that road and porting shape combine is less.
Therefore, developing a kind of constructional simplicity can stablize, and can reduce moment impact pulsation and the intake and exhaust turbulent flow of air-flow
Disturbance, is effectively reduced the Roots blower of noise, is of great significance to Roots blower competitiveness is improved.
Summary of the invention
In order to overcome, equipment volume existing for the low noise Roots blower of the prior art is big, structure is complicated, noise reduction effect
The disadvantages of unobvious, the utility model provide a kind of low noise Roots blower.The low noise Roots blower constructional simplicity
It can stablize, moment impact pulsation and the intake and exhaust turbulence prediction of air-flow can be reduced, the Roots blower of noise is effectively reduced.
To achieve the above object, the technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of low noise
Roots blower includes: casing, wallboard, rotor, synchromesh gear, bearing and fuel tank, and the casing is the cylinder of ellipsoidal cross section
Body, cylinder body are equipped with air inlet and air outlet, and outside is cast with reinforcing rib and installation foot, and overall structure uses stainless steel material；Institute
Stating wallboard includes front wallboard and rear wall plate, is located between casing and major and minor fuel tank, and casing and front wallboard, rear wall plate assemble
After form gas chamber, for by casing is closed at both ends and support member as two ends of rotor, the material of wallboard to be using stainless
Steel material.It is provided with seal section on forward and backward wallboard, and is equipped with transmission shaft mounting hole, increases as the connector for connecting fuel tank
Sealing device；Rotor is made of impeller and transmission shaft, including two group rotor of power rotor and driven rotor；Power rotor and from
One end of turn is rotatablely connected by first bearing and wallboard, and the other end is rotatablely connected by second bearing and wallboard；It is described
Impeller includes mutually matched active impeller and driven impeller, and active impeller and driven impeller and a pair of of synchromesh gear pass through transmission
Axis connection simultaneously reversely rotates under gearing；It does not cross at rotor center and is symmetrically arranged with respectively two groups times close to air outlet in casing
Chute, every group of backflash are arranged by V-arrangement by multiple single backflashes, are open towards air outlet, can mitigate the pressure of air opening end
Outburst.When impeller and casing, wallboard, which are formed by cavity, to enter air-tight state, there is the high pressure gas of air outlet on a small quantity
Part can pass back into cavity, and cavity and air outlet gas chamber is made to form certain pressure balance.The impeller is involute three
Leaf impeller, Ye Feng and Ye Gu are used to round as a ball arc, and centre is involute, and involute passes through and the tangent cycloid Duan Lian of circular arc
It connects.
Preferably, the impeller body is made of Ye Feng the and Ye Gu shape being sequentially connected, any one highest point Ye Feng
To its adjacent leaf paddy minimum point molded line successively by AB sections of top arc, BC sections of cycloid, CD sections of involute, DE sections of cycloid and root
EF sections of conjugate curves compositions of circular arc；
Top AB sections using to round as a ball arc, to guarantee that the tooth top of rotor seals, parametric equation are as follows:
BC sections of cycloid are the straightway for connecting involute CD and circular arc AB, parametric equation are as follows:
In formula, (xB, yB) it is B point coordinate, it is calculated by equation (1)；(xC, yC) it is C point coordinate, by above-mentioned involute
Equation calculation obtains.
CD is involute section, and parametric equation is as follows:
In formula, αtFor pitch circle pressure angle,r0For the base radius of gradually line,Y is 0.85
Between~0.95；teFor the corresponding parameter of involute terminal C, te=invTe+Te；tbFor the corresponding parameter of involute starting point D, tb
=invTb+Tb。
DE sections of cycloid are the straightways being connected with involute CD and circular arc EF, and DE and EF is tangent, and parametric equation is as follows:
In formula, (xD, yD) be involute starting point D coordinate, be calculated by equation (5), (6).
Circular arc EF sections of root, parametric equation are as follows:
Preferably, single backflash is U-shaped.
Preferably, the air outlet is oval gradual-enlargement type, and air outlet outer diameter is identical as circular pipe aperture.
Preferably, the synchromesh gear is helical teeth tooth form.
Preferably, the air inlet is equipped with air filter.
The advantageous effects of the utility model:
1, the low noise Roots blower of the utility model uses the reflux slot structure that V-arrangement arrangement is pressed by multiple single backflashes
The moment impact of air-flow can be reduced in blower exhaust, to reduce noise intensity.Advise pressure at expulsion variation according to cosine
Rule increases.The pressure burst that air opening end can be mitigated, sealed shape will be entered by being formed by cavity in impeller and casing, wallboard
When state, the high pressure gas of air outlet is made to have a small amount of part that can pass back into cavity, and it is certain to form cavity and air outlet gas chamber
Pressure balance.Meanwhile when impeller continues rotation, cavity volume becomes smaller, pressure increase, and the vortex that can both reduce gas in this way is made an uproar
Sound, and impact noise caused by can reduce exhaust when is excessively discharged as pressure.
2, the low noise Roots blower of the utility model, air outlet uses gradual-enlargement type elliptic design, by element volume
The process communicated with exhaust outlet becomes gradual change type from mutation formula, extends the time of high pressure gas flow-reversing impingement, reduces reflux
The intensity and aerodynamic noise of impact.
3, impeller uses involute-type triplicate blade impeller, and base radius is less than the radius of traditional involute-type molded lines of rotor, turns
Son seems tall and thin, not only avoids interference problem, and its area utilization factor increases.Molded line engagement process is gradually to connect
Continuous, air-flow will not generate unexpected compression or vacuum effect, and pneumatic noise is with regard to low.
4, the low noise Roots blower of the utility model, under the premise of noise, flow, pressure and other parameters are identical, than
Existing Roots blower reduces volume, has saved space, reduces installation confined condition, has saved cost, improves benefit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the low noise Roots blower of the utility model；
Fig. 2 is the assembling schematic diagram of the low noise Roots blower of the utility model；
Fig. 3 is the casing structure schematic diagram of the low noise Roots blower of the utility model；
Fig. 4 is the section schematic diagram of the low noise Roots blower of the utility model；
Fig. 5 is the rotor line illustration of the low noise Roots blower of the utility model.
In figure: 1: casing；2: wallboard；3: rotor；4 synchromesh gears；5: bearing；6: fuel tank；7: air inlet；8: air outlet；
9: reinforcing rib；10: backflash；
201: front wallboard；202: rear wall plate；203: seal section；204: transmission shaft mounting hole；
301: slave drive axis；302: active impeller；303: driven impeller；304: initiative drive shaft；
501: first bearing；502: second bearing；
601: main fuel tank；602: auxiliary fuel tank.
Specific embodiment
The utility model is described further with reference to the accompanying drawing, specific embodiment does not limit the present invention.
A kind of low noise Roots blower includes: casing 1, wallboard 2, rotor 3, synchromesh gear 4, bearing 5 and fuel tank 6, institute
The cylinder body that casing 1 is ellipsoidal cross section is stated, cylinder body is equipped with air inlet 7 and air outlet 8, and outside is cast with reinforcing rib 9 and installation
Foot, overall structure use stainless steel material；The wallboard 2 includes front wallboard 201 and rear wall plate 202, is located at casing 1 and master
Between fuel tank 601 and auxiliary fuel tank 602, casing 1 and front wallboard 201, rear wall plate 202 form gas chamber after assembling, and are used for casing two
End is closed and the support member as two ends of rotor, and the material of wallboard 2 uses stainless steel material.Front wallboard 201, rear wall plate
It is provided with seal section 203 on 202, and is equipped with transmission shaft mounting hole 204, increases as the connector for connecting fuel tank 601,602
Sealing device；Rotor 3 is made of impeller and transmission shaft, including two group rotor of power rotor and driven rotor；Including phase interworking
The active impeller 302 and driven impeller 303 of conjunction, active impeller 302 and driven impeller 303 and a pair of of synchromesh gear 4 pass through actively
Transmission shaft 304, the connection of slave drive axis 301 simultaneously reversely rotate under the effect of synchromesh gear 4, and the synchromesh gear 4 is helical teeth tooth
Shape；One end of power rotor and driven rotor is rotatablely connected by first bearing 501 and wallboard, and the other end passes through second bearing
502 are rotatablely connected with wallboard；It is not crossed at rotor center in casing 1 close to air outlet and is symmetrically arranged with two groups of backflashes 10 respectively, often
Group backflash 10 is arranged by multiple single backflashes by V-arrangement, is open towards air outlet, can be mitigated the pressure burst of air opening end.
When impeller 302,303 and casing 1, wallboard 2, which are formed by cavity, to enter air-tight state, there is the high pressure gas of air outlet
A small amount of part can pass back into cavity, and cavity and air outlet gas chamber is made to form certain pressure balance.Meanwhile when impeller 302,
303 continue rotation when, cavity volume becomes smaller, pressure increase, but may make closed containing cavity largely discharge gases before can pass through back
Impact caused by discharge orifice walkthrough can not only reduce the eddy current crack of gas in this way, but also can reduce exhaust when is excessively discharged as pressure
Noise.The air inlet 7 is equipped with air filter, the air outlet 8 gradual-enlargement type ellipse, air outlet outer diameter and circle
Pipeline aperture is identical, and single backflash is U-shaped.
The impeller body is made of Ye Feng the and Ye Gu shape being sequentially connected, any one highest point Ye Feng is adjacent to its
The molded line of leaf paddy minimum point successively being total to by AB sections of top arc, BC sections of cycloid, CD sections of involute, DE sections of cycloid and root circular arc
EF sections of yoke curve compositions；
Top AB sections using to round as a ball arc, to guarantee that the tooth top of rotor seals, parametric equation are as follows:
BC sections of cycloid are the straightway for connecting involute CD and circular arc AB, parametric equation are as follows:
In formula, (xB, yB) it is B point coordinate, it is calculated by equation (1)；(xC, yC) it is C point coordinate, by above-mentioned involute
Equation calculation obtains.
CD is involute section, and parametric equation is as follows:
In formula, αtFor pitch circle pressure angle,r0For the base radius of gradually line,Y is 0.85
Between~0.95；teFor the corresponding parameter of involute terminal C, te=invTe+Te；tbFor the corresponding parameter of involute starting point D, tb
=invTb+Tb。
DE sections of cycloid are the straightways being connected with involute CD and circular arc EF, and DE and EF is tangent, and parametric equation is as follows:
In formula, (xD, yD) be involute starting point D coordinate, be calculated by equation (5), (6).
Circular arc EF sections of root, parametric equation are as follows:
The low noise Roots blower of the utility model, which is used, to be existed by multiple single backflashes by the reflux slot structure of V-arrangement arrangement
Blower can reduce the moment impact of air-flow when being vented, to reduce noise intensity.Make pressure at expulsion variation according to cosine rule
Increase, such noise frequency relatively concentrates on low frequency range, to improving the noise elimination effect of silencer than advantageous.Outlet air can be mitigated
The pressure burst at mouth end makes the high pressure of air outlet when impeller and casing, wallboard, which are formed by cavity, to enter air-tight state
Gas has a small amount of part that can pass back into cavity, and cavity and air outlet gas chamber is made to form certain pressure balance.Meanwhile working as impeller
When continuing rotation, cavity volume becomes smaller, pressure increase, and may make closed containing cavity that can pass through return port before largely discharge gas
Impact noise caused by walkthrough can not only reduce the eddy current crack of gas in this way, but also can reduce exhaust when is excessively discharged as pressure.
The process that element volume is communicated with exhaust outlet is become gradual change from mutation formula by air outlet gradual-enlargement type elliptic design
Formula extends the time of high pressure gas flow-reversing impingement, reduces the intensity and aerodynamic noise of flow-reversing impingement.In addition, air-flow is from wind
It is directly entered circular pipe identical with exhaust outlet aperture after machine discharge, exporting expansion suddenly will increase vortex intensity and make an uproar
Sound, design gradual-enlargement type taper exhaust outlet advantageously reduce turbulence noise.
It should be pointed out that above-mentioned preferred embodiment is only to illustrate the technical ideas and features of the present invention, purpose
It is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly, this reality can not be limited with this
With novel protection scope.All equivalent change or modifications according to made by the spirit of the present invention essence, should all cover in this reality
Within novel protection scope.
Claims (6)
1. a kind of low noise Roots blower, including casing, wallboard, rotor, synchromesh gear, bearing and fuel tank, it is characterised in that:
The casing is the cylinder body of ellipsoidal cross section, and cylinder body is equipped with air inlet and air outlet, and outside is cast with reinforcing rib and installation foot；
The wallboard includes front wallboard and rear wall plate, is located between casing and major and minor fuel tank, and casing and front wallboard, rear wall plate fill
Gas chamber is formed after matching, for by casing is closed at both ends and support member as two ends of rotor；It is provided on forward and backward wallboard
Seal section, and it is equipped with transmission shaft mounting hole；Rotor is made of impeller and transmission shaft, including power rotor and two groups of driven rotor turns
Son；One end of power rotor and driven rotor is rotatablely connected by first bearing and wallboard, and the other end passes through second bearing and wall
Plate rotation connection；The impeller includes mutually matched active impeller and driven impeller, and active impeller is with driven impeller synchronous
It is reversely rotated under gearing；It is not crossed at rotor center in casing close to air outlet and is symmetrically arranged with two groups of backflashes respectively, every group
Backflash is arranged by multiple single backflashes by V-arrangement, is open towards air outlet；The impeller is involute triplicate blade impeller, leaf
Peak and Ye Gu are used to round as a ball arc, and centre is involute, and involute is connected by the cycloid section tangent with circular arc.
2. a kind of low noise Roots blower according to claim 1, it is characterised in that: the impeller line style is by successively phase
Ye Feng and Ye Gu shape composition even, the molded line of any one highest point Ye Feng to its adjacent leaf paddy minimum point is successively by top arc
AB sections, BC sections of cycloid, CD sections of involute, DE sections of cycloid and circular arc EF sections of root composition:
Top AB sections using to round as a ball arc, to guarantee that the tooth top of rotor seals, parametric equation are as follows:
BC sections of cycloid are the straightway for connecting involute CD and circular arc AB, parametric equation are as follows:
In formula, (xB, yB) it is B point coordinate, it is calculated by equation (1)；(xC, yC) it is C point coordinate, by above-mentioned involute equation meter
It obtains；
CD is involute section, and parametric equation is as follows:
In formula, αtFor pitch circle pressure angle,r0For the base radius of gradually line,Y 0.85~
Between 0.95；teFor the corresponding parameter of involute terminal C, te=invTe+Te；tbFor the corresponding parameter of involute starting point D, tb=
invTb+Tb；
DE sections of cycloid are the straightways being connected with involute CD and circular arc EF, and DE and EF is tangent, and parametric equation is as follows:
In formula, (xD, yD) be involute starting point D coordinate, be calculated by equation (5), (6)；
Circular arc EF sections of root, parametric equation are as follows:
3. according to claim 1 or a kind of 2 any low noise Roots blowers, it is characterised in that: single reflux
Slot is U-shaped.
4. a kind of low noise Roots blower according to claim 1, it is characterised in that: the air outlet is ellipse
Gradual-enlargement type, air outlet outer diameter are identical as circular pipe aperture.
5. a kind of low noise Roots blower according to claim 1, it is characterised in that: the synchromesh gear is helical teeth tooth
Shape.
6. a kind of low noise Roots blower according to claim 1, it is characterised in that: the air inlet is equipped with
Air filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820986338.2U CN208380857U (en) | 2018-06-26 | 2018-06-26 | A kind of low noise Roots blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820986338.2U CN208380857U (en) | 2018-06-26 | 2018-06-26 | A kind of low noise Roots blower |
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| Publication Number | Publication Date |
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| CN208380857U true CN208380857U (en) | 2019-01-15 |
Family
ID=64965747
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820986338.2U Expired - Fee Related CN208380857U (en) | 2018-06-26 | 2018-06-26 | A kind of low noise Roots blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208380857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374872A (en) * | 2019-08-28 | 2019-10-25 | 南通晨光石墨设备有限公司 | Blower |
-
2018
- 2018-06-26 CN CN201820986338.2U patent/CN208380857U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374872A (en) * | 2019-08-28 | 2019-10-25 | 南通晨光石墨设备有限公司 | Blower |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190115 Termination date: 20200626 |
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| CF01 | Termination of patent right due to non-payment of annual fee |