CN102927009A - Low-noise roots vacuum pump - Google Patents

Abstract

The invention provides a low-noise roots vacuum pump. The low-noise roots vacuum pump comprises a pump body, a rotor, side plates, a shaft, synchronous gears and a belt wheel, wherein the pump body is provided with an air inlet and an air outlet; the rotor is arranged in the pump body; the side plates are arranged on two axial ends of the pump body; the shaft is connected with the rotor through a bearing and in a coupling way; the synchronous gears with oil tanks are respectively connected to two ends of the shaft in the coupling way; an internal air outlet of the pump body is in the shape of a symmetric ditrigon which is formed in a way that the vertex angles of isosceles triangles are opposite to each other along the axial direction of the pump body; an internal air inlet of the pump body is in the shape of a symmetric double trapezoid which is formed in a way that the upper short bottoms of the isosceles trapezoids are opposite to each other along the axial direction of the pump body; symmetric polyhedral variable-diameter noise-reducing muffling chambers are arranged on two ends of the air outlet and the air inlet on the pump body along the axial direction; and noise barriers are arranged in the middles of the symmetric polyhedral variable-diameter noise-reducing muffling chambers along the axial direction of the pump body. The low-noise roots vacuum pump has the characteristics of being low in noise, small in vibration caused by the impacting of return air, high in safety and reliability, simple in structure, and high in economic benefit and social benefit.

Description

A kind of low noise Roots pump

Technical field

The present invention relates to a kind of vacuum pump, particularly a kind of low noise Roots pump.

Background technique

Roots pump is widely used in the industries such as metallurgy, chemical industry, medicine, IC, food, be a kind of double rotor machinery, drive two rotors by prime mover by a pair of synchromesh gear, make the constant speed rotation of opposite direction, two rotor axis are parallel, and the inlet and outlet mouth does not directly communicate.Produce the high strength noise when Roots pump formation aerodynamic noise, especially High Pressure Difference in service, discharging directly into atmosphere, to external radiation, environmental pollution is very serious through the inlet and outlet mouth.In China's patent No. is the patent documentation of ZL200920116334.X, once disclose a kind of Roots pump of three leaf meander configuration conjugation rotors, and it is characterized in that utilizing the engagement of three leaf meander configuration conjugation rotors to reduce noise; The patent No. is to announce a kind of high-power non-linear sound reduction method of double leaf countercurrent cooling type Roots pump and baffler in the patent documentation of ZL201010211294.4, mainly is to utilize the baffler noise reduction for noise spectrum.Although patent ZL200920116334.X can play the effect that reduces noise, but because the leakage area of meander configuration rotor is larger than straight blade profile rotor leakage area, so so that the pumping speed of meander configuration rotor Roots pump is lower than straight blade profile rotor Roots pump pumping speed, reach equal pumping speed need increase energy consumption; Patent ZL201010211294.4 has improved baffler for noise spectrum, is the noise that has produced is carried out reprocessing, and noise source is not had Noise Reduction.

Achievement in research aspect noise reduction is more rare at present, demands urgently improving.

Summary of the invention

The objective of the invention is for the deficiencies in the prior art, a kind of low noise Roots pump is provided, can delay relief opening high pressure difference gas backflow pressure equalizing, and along with the rotation of rotor, make high pressure difference gas reflux equal pressure surface long-pending little by little but not the blast formula increase, it has unique sound source denoising structure, use the sound wave interference principle, the aerodynamic noise of generation is subdued at the place in Roots pump pump housing pneumatic noise sound source, do not increase energy consumption, tool reflux gas impact shock is little, and noise is low, safety reliability good, characteristics simple in structure.

Studies show that, the poor Roots pump of conventional high-tension is in the moment that the low pressure element volume is opened, and refluxes rapidly from the pressurized gas of relief opening, and the gas pressure in the element volume is raise suddenly, form thus gas compression and produce aerodynamic noise, in pump, form noise source.High Pressure Difference, the aerodynamic noise that comes from just exhaust ports in the pump housing that roots vacuum intensity in service is the highest, environmental pollution is maximum.

Technical solution of the present invention is, described this improved low noise Roots pump, as shown in Figure 1, by thepump housing 1,place rotor 2 in thepump housing 1, thepump housing 1 axial twoends side plate 3, by bearing 8 be coupling the axle 4 ofrotor 2,synchromesh gear 5 and the belt pulley 7 with the fuel tank 6 that are coupling at axle 4 two ends respectively form.Its technical characterstic is, interior relief opening to traditional Roots pump pump housing, interior suction port improves, relief opening in the former parallel quadrilateral is modified into alongrelief opening 11 in the symmetrical triangle of thepump housing 1 axial isosceles triangle drift angle vertical angles, suction port in the former parallel quadrilateral is modified into along the symmetrical trapezoidalinterior suction port 12 of the short upper base of thepump housing 1 axial isosceles trapezoid to short upper base, and the suction port on the Roots pump pump housing and relief opening are provided with symmetrical multiaspect noise-reduction chamber 13 along place, thepump housing 1 axial two ends, axially radially be provided withinsulation board 14 along thepump housing 1 in the middle of the symmetrical multiaspect reducing in the two ends noise-reduction chamber 13 at thepump housing 1 suction port and relief opening along the pump housing (1), referring to Fig. 2～5.

Through above improved this pump body structure low noise Roots pump, can prolong the time that pressurized gas reflux, all pressures noise when reducing pressurized gas and refluxing, and can effectively reduce high pressure reflow gas to the vertical impact power of the Roots pump rotor shaft that runs up.Simultaneously, the reflection of all pressures radiation noise producing, refraction, interference and diffuse reflection effect that symmetrical multiaspect noise-reduction chamber 13 andinsulation board 14 jointly reflux and produce pressurized gas, further reduce noise energy, the present technique product structure is simple, easily manufactured, the noise reduction technology that is applicable to existing all Roots pumps improves.

Outstanding advantages of the present invention is: 1, during the running of this machine rotor, on the pump housing along relief opening in thepump housing 1 axial symmetrical triangle make high pressure difference gas reflux equal pressure surface long-pending little by little but not the blast formula increase, delayed relief opening high pressure difference gas backflow pressure equalizing, reduced Sound source noise, form simultaneously 180 ° of phase difference sound wave interference noise reductions, the aerodynamic noise sound wave that the High Pressure Difference reflux gas that radiates produces noise energy after symmetrical multiaspect noise-reduction chamber 13 and 14 Multi reflection refractions of insulation board further reduces, and again form 180 ° of phase difference sound wave interference noise reductions in thepump housing 1 exhaust ports, thereby reach the purpose of effectively subduing the Roots pump aerodynamic noise.

2, reflux airflow forms in opposite directions air-flow in the element volume chamber, has offset the flow-reversing impingement vibration, effectively reduces high pressure reflow gas to the vertical impact power of the rotor shaft that runs up;

3, do not increase energy consumption;

4, insulation board of the present invention and the pump housing are integrated, and have increased heat diffusion area;

5, the present invention is applicable to various Roots pumps, such as the noise reduction technology transformation of two leaves, three leaf Roots pumps, implements easily, and is convenient, practical.

Description of drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is the schematic appearance of Fig. 1;

Fig. 3pump housing 1 radial cross-section;

Inside relief opening 11 schematic representation of Fig. 4 pump housing 1 A;

Insidesuction port 12 schematic representation of Fig. 5 pump housing 1 B.

Being denoted as in above Fig. 1～5:

1-pump housing,

11-pump housing, 1 interior relief opening,

12-pump housing, 1 interior suction port,

13-symmetrical multiaspect reducing noise-reduction chamber,

14-insulation board,

2-rotor,

3-side plate,

4-axle,

5-synchromesh gear,

6-fuel tank,

7-belt pulley,

8-bearing.

 

Specific implementation method

As shown in Figure 1, the present invention is a kind of low noise Roots pump, and specific embodiments is: with the Rootspump pump housing 1 of suction port and relief opening adopt forging type casting system form, comprise by thepump housing 1,place rotor 2 in thepump housing 1, thepump housing 1 axial twoends side plate 3, by bearing 8 be coupling the axle 4 ofrotor 2,synchromesh gear 5 and the belt pulley 7 with the fuel tank 6 that are coupling at axle 4 two ends respectively form.Thepump housing 1interior relief opening 11 is the symmetric double triangle along thepump housing 1 axial isosceles triangle drift angle vertical angles,interior suction port 12 is trapezoidal to the symmetric double at the bottom of the minor face at the bottom of thepump housing 1 axial isosceles trapezoid minor face, thepump housing 1 suction port and relief opening are respectively equipped with symmetrical multiaspect reducing noise-reduction chamber 13 along thepump housing 1 axial two ends, and thepump housing 1 suction port and relief opening axially radially are provided withinsulation board 14 along thepump housing 1 in the middle of the symmetrical multiaspect reducing in the two ends noise-reduction chamber 13 along the pump housing (1).

Its groundwork principle is as follows, when the straight blade profile rotor of Roots pump turns in thepump housing 1 symmetricaltriangle relief opening 11, the area that straight blade profile rotor and interior relief opening 11 symmetrical isosceles triangle hypotenuses are opened is spreaded over a whole area from one point gradually increase, make thepump housing 1, spread over a whole area from one point gradually and to open in the low pressure element volume chamber thatrotor 2 andside plate 3 surround, the exhaust ports high pressure difference gas will at first reflux to low pressure element volume chamber simultaneously via symmetrical isosceles triangle two base angles ofrelief opening 11 and all press, rotation along with rotor, high pressure difference gas reflux equal pressure surface long-pending little by little but not the blast formula increase, delayed relief opening high pressure difference gas backflow pressure equalizing, reduced Sound source noise, form simultaneously 180 ° of phase difference sound wave interference noise reductions, the aerodynamic noise sound wave that the High Pressure Difference reflux gas that radiates produces is at symmetrical multiaspect noise-reduction chamber 13 and 14 Multi reflections of insulation board, noise energy further reduces after the refraction, and again form 180 ° of phase difference sound wave interference noise reductions in thepump housing 1 exhaust ports, thereby reach the purpose of effectively subduing the Roots pump aerodynamic noise.Simultaneously reflux airflow forms in opposite directions air-flow in the element volume chamber, has offset the flow-reversing impingement vibration, effectively reduces high pressure reflow gas to the vertical impact power of the rotor shaft that runs up, so so that this Roots pump complete machine has possessed reliable Security.

The present invention realizes the sound source noise reduction to Roots pump with practical, convenient, low-cost mode, has good economic benefit and social benefit.

Claims (4)

1. low noise Roots pump, by with the pump housing (1) of suction port and relief opening, place rotor (2) in the pump housing (1), the pump housing (1) axially two ends side plate (3), by bearing (8) be coupling the axle (4) of rotor (2), the synchromesh gear (5) and the belt pulley (7) that are coupling at the band fuel tank (6) at axle (4) two ends respectively form, it is characterized in that the interior relief opening of the wherein said pump housing (1) (11) is the symmetric double triangle along the axial isosceles triangle drift angle vertical angles of the pump housing (1).

2. by Roots pump claimed in claim 1, it is characterized in that the interior suction port of the wherein said pump housing (1) (12) is that axially the short upper base of isosceles trapezoid is trapezoidal to the symmetric double of short upper base along the pump housing (1).

3. by Roots pump claimed in claim 1, it is characterized in that the pump housing (1) suction port and relief opening axially are respectively equipped with symmetrical multiaspect reducing noise-reduction chamber (13) in two ends along the pump housing (1).

4. by Roots pump claimed in claim 1, it is characterized in that the pump housing (1) suction port and relief opening axially radially are provided with insulation board (14) along the pump housing (1) in the middle of the symmetrical multiaspect reducing noise-reduction chambers, two ends (13) along the pump housing (1).

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