CN100374727C - Low-noise Roots blower - Google Patents
Low-noise Roots blower Download PDFInfo
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- CN100374727C CN100374727C CNB2004100467015A CN200410046701A CN100374727C CN 100374727 C CN100374727 C CN 100374727C CN B2004100467015 A CNB2004100467015 A CN B2004100467015A CN 200410046701 A CN200410046701 A CN 200410046701A CN 100374727 C CN100374727 C CN 100374727C
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- bridge
- air port
- way air
- type silencing
- support casing
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Abstract
The present invention relates to a low noise Roots blower which comprises a casing with a base, and two bridge type silencing three-way ventilating ports, wherein the exhaust side of the casing is provided with two symmetrical separated isosceles trapezoid exhaust ports in the same shape, and the long trapezoidal bottom edges of the two exhaust ports are respectively positioned on the sides of the two end parts of the casing. The intake side of the casing is respectively provided with two air inlets corresponding to the exhaust side of the casing, and the long trapezoidal bottom edges of the two air inlets are respectively positioned on the sides of the two end parts of the casing. Each bridge type silencing three-way ventilating port is composed of a bridge type three-way communication pipe, two bridge ports which are respectively positioned at the port of the bridge type three-way communication pipe, and a common ventilation port. The two bridge ports are positioned in the same plane, and the two bridge ports and the bridge type three-way communication pipe which is connected with the two bridge ports are symmetrically arranged on both sides of the central axis of the common ventilation port. The central axis of the common ventilation port is perpendicular to the central axis of the communication pipe by which the two bridge ports can be communicated. The present invention has the characteristics of low noise, good safety, simple structure and convenient assembly, adjustment and maintenance.
Description
Technical field
The present invention relates to a kind of low noise Roots blower.
Background technique
Roots blower extensively applies to all trades and professions, it is a kind of two-spool compressor tool, two rotors are driven by a pair of synchromesh gear by prime mover, do the opposite constant speed rotation of direction, the parallel axes of two rotors, blower inlet and outlet mouth does not directly communicate, rotor and casing and wallboard surround the element volume of sealing, element volume does not change in operation process substantially, in the moment that element volume is opened, pressurized gas from exhaust cavity reflux rapidly, and the gas pressure in the element volume is raise suddenly, form gas compression thus and produce the gas shock noise.The aerodynamic noise just that Roots blower intensity in service is the highest, have the greatest impact, it in blower fan, form noise source and through blower advance, exhaust port is to external radiation, serious environment pollution.
A kind of Roots blower that has backflow device is disclosed in China patent ZL94201397.2, comprise casing, impeller shaft and impeller, adorn impeller on the impeller shaft in the casing, the casing two ends have intake grill and exhaust outlet, open refluxing opening on the casing of exhaust outlet both sides, refluxing opening communicates with exhaust outlet, dress pressurized machine and cooler on the honeycomb duct between refluxing opening, the exhaust outlet; In China utility model patent ZL95235177.3, announce a kind of Roots blower, vacuum pump new structure that has backflow device, include Roots blower and vacuum pump and adverse current supplier, because impeller top top width B#-[1] with the ratio B#-[1 of impeller diameter D]/D=1/10～1/3, impeller top top width central angle θ=11.5 °～42 °, casing relief opening to the exhibition angle, center in adverse current air inlet duct can reach 33.5 °～82 °, pre-admission is boosted, cooling procedure can prolong 29%～78% than prior art, thereby can strengthen cooling, noise reduction.
Disclose a kind of leaf low noise Roots blower of turning round in China patent ZL97238482.0, it is made up of parts such as twisted impeller, oblique-toothed synchronous gear, main driven shaft, bearing means, black box and casings.Owing to adopt twisted impeller and said structure, the distribution pressure pulsation reduces noise and vibration amplitude gently when making its work.
A kind of low noise Roots blower is disclosed in China's number of patent application 02274930.6, it comprises casing, impeller and impeller shaft, casing is separated into appearance combination casings such as multi-cavity with dividing plate, the impeller shaft of pair of parallel is housed in the combination casing, on the impeller shaft in each cavity volume a pair of impeller that external tooth is meshed is housed, torsion angle between the coaxial impeller is according to the blade amt five equilibrium of this impeller, and the swept volume of having dwindled Roots blower has reduced noise.
A kind of Roots blower is disclosed in China patent application notification number CN1177063A, it is to open with reference to Japan Patent is real that clear 49-63507 is provided with and the Roots blower of the mutually perpendicular groove of rotor gyratory directions on inner walls, Te Kaiping 3-124988 on inner walls, be provided with respect to the Roots blower of the angled spiral slot structure of the imaginary line of the parallel to an axis of rotor, drive a kind of pressurized machine of increase that clear 62-173579 announces in fact, this pressurized machine is provided with behind the Roots blower of the axial straight-line groove structure of rotor in vane tip position to the inner walls between the delivery outlet of the gyratory directions front end when being interdicted by the blade of rotor gyratory directions rear end with being communicated with of suction port Roots blower casing exhaust side inwall is improved, its feature from the blade of the gyratory directions rear end of a pair of rotor will with suction port be communicated with blocking the time the inner walls face in vane tip position to the zone of delivery outlet of gyratory directions front end on, gyratory directions along rotor, form a plurality of zigzag flexion grooves, when the air from delivery outlet one side direction low-pressure cavity one side reverse flow passes through this flexion groove, air velocity slowly reduces, suppress the rising of pressure, therefore can reduce noise.
The above patent, be respectively to increase backflow device outside on the Roots blower casing, change the Roots Blower Rotor blade profile, separate the Roots blower chassis cavity with dividing plate, change Roots blower casing exhaust side interior wall construction etc., its common ground is to delay high pressure reflow gas process, reach the effect that reduces noise, but the intense radiation noise that noise source takes place do not had to disappear fall function, and the enforcement of some patent has suitable difficulty, as it is big to turn round the difficulty of processing of leaf rotor, dividing plate is separated the complex structure manufacturing assembling difficulty of chassis cavity, change the requirement of casing exhaust side interior wall construction increase to mould, increase the dress backflow device and increase manufacturing maintenance cost etc.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of low noise Roots blower is provided, it has unique sound source denoising structure, utilization sound wave interference principle, subdue the aerodynamic noise that blower produces at blower pneumatic noise sound source place, the tool noise is low, safety reliability good, characteristics are easily adjusted and overhauled in simple in structure, assembling.
Realize that technological scheme of the present invention is, casing and exhaust to traditional Roots blower, inlet structure improves, described a kind of low noise Roots blower includes band support casing 1, two the first bridge-type silencing three-way air port 8 and second bridge-type silencing three-way air ports 14 that are provided with the reducing silencing cavity, it is characterized in that, band support casing 1 exhaust side is provided with that symmetry is separated by, shape is identical, respectively near band support casing 1 two ends 6, two isosceles trapezoid relief openings 2 of 7,3, and these two isosceles trapezoid relief openings 2,3 trapezoidal long base is positioned at band support casing 1 end 6 respectively, 7 sides, band support casing 1 air inlet side is respectively equipped with and corresponding two the isosceles trapezoid suction ports 4 of described band support casing 1 exhaust side, 5, and these two isosceles trapezoid suction ports 4,5 trapezoidal long base is positioned at band support casing 1 end 6 respectively, 7 sides, two isosceles trapezoid relief openings 2 of band support casing 1,3 plane parallel are in isosceles trapezoid suction port 4,5 planes, described low noise Roots blower, its feature also are two isosceles trapezoid relief openings 2 with support casing 1,3 and two isosceles trapezoid suction ports 4,5 tool interchangeability.The described low noise Roots blower first bridge-type silencing three-way air port 8 is by bridge-type threeway connecting tube 11 and two bridge mouths 9 that lay respectively at this bridge-type threeway connecting tube port, 10 and cowind-mouths 12 constitute, the threeway portion that it is characterized in that the first bridge-type silencing three-way air port 8 is provided with reducing silencing cavity 13, reducing silencing cavity 13 is at bridge-type threeway connecting tube 11 central part, on the cowind-mouth 12 connecting flange is arranged, the cross section of bridge-type threeway connecting tube 11 is not limited to circle, two bridge mouths 9 in the first bridge-type silencing three- way air port 8,10 are in same plane and described two bridge mouths 9,10 and be symmetrical in both sides, described cowind-mouth 12 medial axis described bridge-type threeway connecting tube 1, cowind-mouth 12 medial axis be communicated with two bridge mouths 9, the medial axis of 10 connecting tube is vertical, and its feature is that also the first bridge-type silencing three-way air port 8 is identical with the formation in the second bridge-type silencing three-way air port 14.Two bridge mouths 9 in the first bridge-type silencing three- way air port 8,10 respectively with two isosceles trapezoid relief openings 2 being with support casing 1 exhaust side, 3 corresponding connections, two bridge mouths 15 in the second bridge-type silencing three-way air port 14,16 respectively with two isosceles trapezoid suction ports 4 being with support casing 1 air inlet side, 5 corresponding connections, it is characterized in that the second bridge-type silencing three-way air port 14 or the first bridge-type silencing three-way air port 8 and the 1 disjunctor manufacturing of band support casing, the first bridge-type silencing three-way air port 8 or the second bridge-type silencing three-way air port 14 are connected to band support casing 1 by fastening piece, also can the first bridge-type silencing three-way air port 8, the second bridge-type silencing three-way air port 14, join together by fastening piece after the 1 three's split manufacturing of band support casing, when the first bridge-type silencing three-way air port 8 or the second bridge-type silencing three-way air port 14 and band support casing 1 connect by fastening piece, two bridge mouths 9 that it is characterized in that the first bridge-type silencing three-way air port 8, two bridge mouths 15 in the 10 or second bridge-type silencing three-way air port 14, on 16 and two isosceles trapezoid relief openings 2 of band support casing 1,3 or two isosceles trapezoid suction ports 4, connecting flange is arranged, two bridge mouths 9 in the first bridge-type silencing three-way air port 8 on 5, two bridge mouths 15 in the 10 or second bridge-type silencing three-way air port 14,16 with two isosceles trapezoid relief openings 2 of band support casing 1,3 or two isosceles trapezoid suction ports 4, between 5 connecting flange sealing gasket is arranged.
This structural design distinctive feature of above-mentioned Roots blower is to carry out the multinomial noise reduction sound that disappears at the noise source place of blower, and traditional Roots blower is to disappear by external silencing apparatus to fall the radiation noise.
Advantage of the present invention is, the element volume chamber and the first bridge-type silencing three-way air port 8 that utilize low noise Roots blower band support casing 1 and rotor and wallboard to constitute, the reducing silencing cavity 13 of the threeway portion in the second bridge-type silencing three-way air port 14 is jointly as the noise source silencing cavity, when the moment that the Roots blower element volume is opened, two the isosceles trapezoid relief openings 2 of pressurized gas while on band support casing 1 from exhaust cavity, 3 reflux in the element volume chamber rapidly, reflux gas forms air-flow in opposite directions in the element volume chamber, 180 ° of phase difference gas shock noise sound wave interferences take place, thereby reach the function that disappears to noise, the pneumatic noise that element volume unlatching simultaneously radiates is through two bridge mouths 9 in the first bridge-type silencing three- way air port 8,10 arrive reducing silencing cavity 13 simultaneously, also form the sound wave interference of pneumatic noise in opposite directions of 180 ° of phase differences at reducing silencing cavity 13 places, thereby reach the function that disappears to radiated noise, the second bridge-type silencing three-way air port 14 is identical with the first bridge-type silencing three-way air port, 8 formations, and function is also identical.
Another advantage of the present invention is, two isosceles trapezoid relief openings 2 on the band support machine 1,
3 design, not only make the open area of Roots blower exhaust gap extremely maximum by zero gradual change, prevented the open area sudden change of relief opening exhaust gap, delayed the reflux course of pressurized gas, reduced noise, and because reflux gas is through two isosceles trapezoid relief openings 2 at band support casing 1 two ends, 3 reflux simultaneously, in the element volume chamber, form air-flow in opposite directions, thereby further reduced the gas shock noise that the backflow pressurized gas produce, also reduce the gas shock energy that the backflow pressurized gas produce, reached the difunctional of sending down abnormally ascending stream impact noise and impact energy that disappear.In addition with the design of two isosceles trapezoid relief openings on the support casing 1, the close spring bearing place of the rotor shaft of gas shock energy in casing that the backflow pressurized gas are produced, thereby the flexible deformation influence of the rotor shaft that turns round in the casing reduced, guaranteed the safe operation of blower fan.
Another advantage of the present invention is that the reducing silencing cavity 13 of the threeway portion in the first bridge-type silencing three-way air port 8 or the second bridge-type silencing three-way air port 14 not only plays the function of the noise reduction sound that disappears, and also has the effect of buffering adverse current pressurized gas impact energy.During the operation of traditional Roots blower when chance has a power failure suddenly or stops in emergency, pressurized gas in the exhaust duct are rapidly to Roots blower casing adverse current, its powerful impact energy without the center that acts directly on rotor shaft with stopping, make it produce big flexible deformation, destroy the proper functioning gap between rotor, serious causes two-spool bump damage even causes scrapping of whole Roots blower.Referring to Fig. 4, the present invention is owing to the existence of the reducing silencing cavity 13 of the threeway portion that the first bridge-type silencing three-way air port 8 or the second bridge-type silencing three-way air port 14 are arranged, when the prominent chance of Roots blower has a power failure or stops in emergency, the powerful impact energy of adverse current high pressure draught a at first acts on reducing silencing cavity 13 in the exhaust duct, form reflected gas stream b at this, make impact energy subdue rapidly and shunt to two bridge mouths, form high pressure and divide stream c, and the impact energy of subduing and shunting acts on the close spring bearing place of rotor shaft in the casing, but not the rotor shaft center has prevented the equipment accident of Roots blower effectively.
An also advantage of the present invention is, be with support casing 1 and the first bridge-type silencing three-way air port 8 or second being communicated with of bridge-type silencing three-way air port 14 be designed to connect with flange, it not only makes makes simply, also make the connection of the two, separate easily, when assembling or maintenance Roots blower, can be very convenient, accurately at the two isosceles trapezoid relief openings 2 of being with support casing 1,1 of place's detection rotor and band support casing, between rotor and wallboard, gap between two rotors, the tradition Roots blower is by cowind-mouth above-mentioned gap to be detected, meet the little or rotor length of air port bore when longer, make detection difficult and precision inaccurate, thereby influence product performance.
Description of drawings
Referring to Fig. 1 to Fig. 4.
Fig. 1 is a schematic representation of the present invention, comprise band support casing, two isosceles trapezoid relief openings 2 on the band support casing 1,3, the both ends of the surface 6 of band support casing 1,7, the first bridge-type silencing three-way air port 8 and constitute the two bridge mouths 9 in the first bridge-type silencing three- way air port 8,10 and bridge-type threeway connecting tube 11 and cowind-mouth 12 and reducing silencing cavity 13, the two bridge mouths 15 in the second bridge-type silencing three-way air port 14,16, the formation in the second bridge-type silencing three-way air port 14 is identical with the first bridge-type silencing three-way air port 8, and has illustrated the band support casing 1 and the first bridge-type silencing three-way air port 8, the connection in the second bridge-type silencing three-way air port 14, connect.
Fig. 2 is the schematic representation that the connection in two the isosceles trapezoid relief openings 2,3 of Fig. 1 band support casing 1 and the first bridge-type silencing three-way air port 8 is connected partial cutaway.
Fig. 3 is the schematic perspective view of band support casing 1, and it has illustrated band support casing 1 exhaust side two isosceles trapezoid relief openings 2,3 identical shaped, that symmetry is separated by and two isosceles trapezoid suction ports of air inlet side 4,5 near the trapezoidal long base of the position distribution of the end face 6,7 of band support casing (1) and 2,3 and two isosceles trapezoid suction ports 4,5 of two isosceles trapezoid relief openings end face 6,7 sides at band support casing 1.
Fig. 4 is that the reducing silencing cavity 13 in the first bridge-type silencing three-way air port 8 is subdued adverse current impact energy schematic representation; Wherein a is the adverse current high pressure draught, and b is a reflected gas stream, and c is the shunting high pressure draught.
Embodiment
Enforcement of the present invention is made easily with prior art, consider the reduction of practical and manufacture cost, the band support casing 1 first bridge-type silencing three-way air port 8 of this low noise Roots blower of the present invention, the manufacturing in the second bridge-type silencing three-way air port 14, connection connecting mode are designed to:
1). the second bridge-type silencing three-way air port 14 is integrally manufactured with band support casing 1, two bridge mouths 15,16 in the second bridge-type silencing three-way air port 14 and two isosceles trapezoid suction ports, 5, the 6 corresponding connections of being with support casing 1, constitute Roots blower casing air port foundation mass, with fastening piece two the bridge mouths 9,10 and the two assembling of foundation mass of blower casing air port in the first bridge-type silencing three-way air port 8 is connected into one, two isosceles trapezoid relief openings, 2, the 3 corresponding connections of two bridge mouths 9,10 in the first bridge-type silencing three-way air port 8 and band support casing 1; Or second bridge-type silencing three-way air port 14 integrally manufactured with band support casing 1, two bridge mouths 15,16 in the second bridge-type silencing three-way air port 14 and two isosceles trapezoid relief openings, 2, the 3 corresponding connections of being with support casing 1, constitute Roots blower casing air port foundation mass, with fastening piece two the bridge mouths 9,10 and the two assembling of foundation mass of blower casing air port in the first bridge-type silencing three-way air port 8 is connected into one, two isosceles trapezoid suction ports, 4, the 5 corresponding connections of two bridge mouths 9,10 in the first bridge-type silencing three-way air port 8 and band support casing 1.
2). the first bridge-type silencing three-way air port 8, the second bridge-type silencing three-way air port 14, the 1 monomer manufacturing respectively of band support casing are connected into one with fastening piece with three's assembling.Two bridge mouths 9,10 in the first bridge-type silencing three-way air port 8, two bridge mouths 15,16 in the second bridge-type silencing three-way air port 14 connect according to the usage requirement pairing with 2,3 and two isosceles trapezoid suction ports 4,5 of two isosceles trapezoid relief openings of band support casing 1.
Claims (8)
1. low noise Roots blower, include band support casing (1), be provided with the first bridge-type silencing three-way air port (8) and the second bridge-type silencing three-way air port (14) of reducing silencing cavity, it is characterized in that, the exhaust side of band support casing (1) is provided with symmetry and is separated by, two isosceles trapezoid relief openings (2 that shape is identical, 3), and these two isosceles trapezoid relief openings (2,3) trapezoidal long base is positioned at band support casing (1) end (6 respectively, 7) side, band support casing (1) air inlet side is respectively equipped with and corresponding two the isosceles trapezoid suction ports (4 of described band support casing (1) exhaust side, 5), and these two isosceles trapezoid suction ports (4,5) trapezoidal long base is positioned at band support casing (1) end (6 respectively, 7) side; The first bridge-type silencing three-way air port (8) is by bridge-type threeway connecting tube (11) and lay respectively at two bridge mouths (9 of this bridge-type threeway connecting tube port, 10) and a cowind-mouth (12) constitute, described two bridge mouths (9,10) be in same plane and described two bridge mouths (9,10) and be symmetrical in described cowind-mouth (12) both sides, medial axis described bridge-type threeway connecting tube (11), cowind-mouth (12) medial axis be communicated with two bridge mouths (9,10) medial axis of connecting tube is vertical, in addition, the above-mentioned second bridge-type silencing three-way air port (14) is identical with the formation in the first bridge-type silencing three-way air port (8), two bridge mouths (9 in the above-mentioned first bridge-type silencing three-way air port (8), 10) respectively with two isosceles trapezoid relief openings (2 being with support casing (1) exhaust side, 3) corresponding connection, two bridge mouths (15 in the second bridge-type silencing three-way air port (14), 16) respectively with two isosceles trapezoid suction ports (4 being with support casing (1) air inlet side, 5) the corresponding connection.
2. low noise Roots blower as claimed in claim 1 is characterized in that two isosceles trapezoid relief openings (2,3) plane parallel with support casing (1) is in two isosceles trapezoid suction ports (4,5) plane.
3. low noise Roots blower as claimed in claim 1 is characterized in that two isosceles trapezoid relief openings (2,3) and two isosceles trapezoid suction ports (4,5) tool interchangeability with support casing (1).
4. low noise Roots blower as claimed in claim 1 is characterized in that the threeway portion in the first bridge-type silencing three-way air port (8) is provided with reducing silencing cavity (13).
5. low noise Roots blower as claimed in claim 1 is characterized in that the cowind-mouth (12) in the first bridge-type silencing three-way air port (8) has connecting flange.
6. low noise Roots blower as claimed in claim 1, it is characterized in that the second bridge-type silencing three-way air port (14) or the first bridge-type silencing three-way air port (8) and the disjunctor manufacturing of band support casing (1), another the first bridge-type silencing three-way air port (8) or the second bridge-type silencing three-way air port (14) are connected to band support casing (1) by fastening piece.
7. low noise Roots blower as claimed in claim 1 is characterized in that joining together by fastening piece after the first bridge-type silencing three-way air port (8), the second bridge-type silencing three-way air port (14), band support casing (1) the three's split manufacturing.
8. as the low noise Roots blower of claim 1 or 6, it is characterized in that the first bridge-type silencing three-way air port (8) or the second bridge-type silencing three-way air port (14) by fastening piece and band support casing (1) when connecting, being with on two bridge mouths (15,16) in two the bridge mouths (9,10) in two isosceles trapezoid relief openings (2,3) of support casing (1) or two the isosceles trapezoid suction ports (4,5) and the first bridge-type silencing three-way air port (8) or the second bridge-type silencing three-way air port (14) all has connecting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100467015A CN100374727C (en) | 2004-08-27 | 2004-08-27 | Low-noise Roots blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100467015A CN100374727C (en) | 2004-08-27 | 2004-08-27 | Low-noise Roots blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1740572A CN1740572A (en) | 2006-03-01 |
| CN100374727C true CN100374727C (en) | 2008-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100467015A Expired - Fee Related CN100374727C (en) | 2004-08-27 | 2004-08-27 | Low-noise Roots blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100374727C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639199A (en) * | 1983-04-02 | 1987-01-27 | Leybold-Heraeus Gmbh | Two-shaft vacuum pump with internal compression |
| CN2533295Y (en) * | 2001-12-14 | 2003-01-29 | 丹徒县粮油机械修造厂 | Roots blower |
| JP2003206875A (en) * | 2002-01-17 | 2003-07-25 | Tochigi Fuji Ind Co Ltd | Roots fluid machinery |
| CN2725580Y (en) * | 2004-08-27 | 2005-09-14 | 张一健 | Low noise roots blower |
-
2004
- 2004-08-27 CN CNB2004100467015A patent/CN100374727C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639199A (en) * | 1983-04-02 | 1987-01-27 | Leybold-Heraeus Gmbh | Two-shaft vacuum pump with internal compression |
| CN2533295Y (en) * | 2001-12-14 | 2003-01-29 | 丹徒县粮油机械修造厂 | Roots blower |
| JP2003206875A (en) * | 2002-01-17 | 2003-07-25 | Tochigi Fuji Ind Co Ltd | Roots fluid machinery |
| CN2725580Y (en) * | 2004-08-27 | 2005-09-14 | 张一健 | Low noise roots blower |
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| Publication number | Publication date |
|---|---|
| CN1740572A (en) | 2006-03-01 |
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Granted publication date: 20080312 Termination date: 20160827 |