CN2330812Y

CN2330812Y - Twist-blade low-noise Roots blower

Info

Publication number: CN2330812Y
Application number: CN 97238482
Authority: CN
Inventors: 刘厚根; 陈世君
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-03
Filing date: 1997-07-03
Publication date: 1999-07-28
Anticipated expiration: 2007-07-03

Abstract

The utility model relates to a twisted-blade low-noise Roots blower. The utility model is composed of a twisted-blade impeller, a synchronous gear with helical teeth, a driving shaft, a driven shaft, a bearing device, a seal assembly, a machine casing, etc., wherein, the twisted-blade impeller, the synchronous gear with helical teeth and a shaft coupling device are connected with the driven shaft and the driving shaft by expanding sleeves instead of flat keys, so the engaged space and the axial location of the twisted-blade impeller can be adjusted conveniently when the utility model is installed and maintained; the working capacity of the fabrication, the installation and the dynamic balance of shafting components can be reduced. Because the utility model uses the twisted-blade impeller and the structure, the utility model slows the air conveying pressure, reduces the noise and the vibration amplitude, improves the volumetric efficiency, and prolongs the service life when the utility model is used. The utility model is also suitable for treating noise for traditional Roots blowers (vacuum pumps).

Description

Turn round leaf low noise Roots blower

The utility model belongs to a kind of low noise Roots blower.

Roots blower is in the past rotated relatively by two straight leaf impellers, the gas that the constant volume extruding is transferred, thus realize air-supply.Because impeller is straight leaf, so during its engagement, periodicity is pushed air-flow, causes the instantaneous rising of distribution pressure, produces periodic aerodynamic noise and vibration radiation noise.In order to reduce the Roots blower noise, adopt triplicate blade impeller and molded lines and exhaust outlet done improvement in shape, its noise reduction is still undesirable.At present, the Roots blower noise-reduction method is still mainly taked to eliminate the noise to its transaudient approach, measures such as insulation against noise and vibration, and so not only the denoising device volume is big, the expense height, and also the noise reduction regulation effect is still not good enough, even also influence putting into operation of Roots blower.

The utility model is a kind of low noise Roots blower that adopts twisted impeller.It makes the output gas pressure pulsation mild, leaks minimizing, thereby reduce the aerodynamic noise and the vibration radiation noise of Roots blower on sound source, and can also improve volumetric efficiency, cuts down the consumption of energy, and increases the service life.

Below in conjunction with accompanying drawing structure and principle are described further:

Wherein Fig. 1 is the utility model structural representation, and Fig. 2 is the A-A sectional view of Fig. 1.

Among Fig. 1: (1) driving shaft (2) left-hand helical gear (3) driven shaft (4) dextrorotation helical gear (5) briquetting stripped nut (6) swelling cover (7) gear-box (8) radial thrust bearing (9) rear wall plate (10) casing (11) front wallboard (12) radial bearing (13) elastic coupling (14) swelling cover

Among Fig. 2: the driven impeller of the interior hexagonal screw of (15) pressure ring (16) (17) (18) is impeller initiatively

With reference to Fig. 2, initiatively impeller (18) and driven impeller (17) are for turning round the leaf blade profile, and rotation direction is opposite mutually.With reference to Fig. 1, Fig. 2, active oblique gear (2) rotation direction is with initiatively impeller (18) rotation direction is opposite; Driven helical gear (4) is opposite with driven impeller (17) rotation direction.Gear, impeller, shaft coupling all lean on the swelling cover to connect.Driving shaft (1) by elastic coupling by motor driving, make initiatively impeller (18) rotation, make left end active oblique gear (2) drive driven helical gear (4) simultaneously and do the constant speed counter-rotating, thereby make driven impeller and active impeller do the constant speed counter-rotating, make the gas of the enclosed cavity between impeller and housing, constantly delivered to exhaust outlet, to realize air blast by impeller.

With reference to Fig. 2, initiatively impeller (18) waits speed in reversed direction " engagement " motion with driven impeller (17) work in housing, during twisted impeller is inswept exhaust outlet, the enclosed cavity that impeller and housing constitute is opened to exhaust outlet gradually, impeller pushes gas gradually rises enclosed cavity and exhaust outlet gas pressure to exhaust outlet gently, so the gas pressure pulsation is mild in the Periodic Rotating motion, simultaneously, three leaves circular arc-arc envelope end molded lines face can reduce between impeller and impeller, leak between impeller and casing, thereby reduce exhaust outlet air pulsing and the caused aerodynamic noise of clearance leakage.

The utility model adopts the helical gear transmission, has reduced the mechanical transmission noise.Helical gear, impeller, shaft coupling all adopt swelling cover to connect with axle so that the adjustment of impeller clearance when assembling, maintenance reduces shaft components processing, assembling and dynamic balancing workload, simplify impeller and spool assembly technology.

Turn round the noise abatement that leaf low noise Roots blower also is applicable to traditional Roots blower (vacuum pump), can be widely used in industries such as metallurgy, petrochemical industry, weaving, cement, mine, building materials, sewage treatment, aquaculture.

Claims

1. turn round leaf low noise Roots blower: comprise driving shaft 1, helical gear 2, driven shaft 3, helical gear 4, briquetting stripped nut 5, swelling grip assembly 6, gear box cover 7, radial thrust bearing group 8, rear wall plate 9, casing 10, front wallboard 11, radial bearing 12, elastic coupling 13, swelling cover 14, pressure ring 15, socket head screw 16, twisted impeller 17, twisted impeller 18.It is characterized in that: twisted impeller 17, twisted impeller 18 its rotation directions are respectively left and right and revolve, and its end face molded lines is three leaves (or four leaves) circular arc-arc envelope curve; Helical gear 2, left and right respectively the revolving of helical gear 4 its rotation directions, and form synchromesh gear.

2. turned round the leaf Roots blower according to what right 1 narrated, it is characterized in that:

Helical gear 2, helical gear 4 all adopt briquetting stripped nut 5, swelling cover 6 to connect with driving shaft 1, driven shaft 3 respectively.

3. according to the right 1 described leaf Roots blower of turning round, it is characterized in that: twisted impeller 17, twisted impeller 18 all adopt socket head screw 16, pressure ring 15, swelling cover 14 to connect with driving shaft 1, driven shaft 3 respectively, and the rotation direction of twisted impeller is opposite with coaxial helical gear rotation direction.

4. according to the right 1 described leaf Roots blower of turning round, it is characterized in that: two radial thrust bearings 8 are all adopted in the fixed end supporting of driving shaft 1 and driven shaft 3, and the end bearing that moves about all adopts radial bearing 12.