CN2533295Y

CN2533295Y - Roots blower

Info

Publication number: CN2533295Y
Application number: CN 01272827
Authority: CN
Inventors: 吴金义; 徐洋
Original assignee: Dantu County Grain & Oil Machinery Manufacturing & Repair Plant
Current assignee: Dantu County Grain & Oil Machinery Manufacturing & Repair Plant
Priority date: 2001-12-14
Filing date: 2001-12-14
Publication date: 2003-01-29
Anticipated expiration: 2011-12-14

Abstract

The utility model discloses a turning fan for forcible air transferring, in particular a cubage type rose fan including a left and a right wall boards fixed on the left end and right end of a shell and a gear box fixed on the outer side of the left wall board; a driving and driven shafts through the shell cavity are joggled with each other with intervals under the driven force of a synchronous gear inside the gear box and rotate oppositely; a driving impeller and a driven impeller are respectively fixed on the driving shaft and the driven shaft; the joggling line of the driving impeller and the driven impeller is arc; the driving impeller and the driven impeller are in three leaves shape; the arc at the joggling place is the internal and external envelop line, thus the joggling course is more full and complete, and internal leakage is reduced, the wind amount is increased, the air current impulse and noise is decreased, and the efficiency of the complete machine is increased.

Description

Roots blower

Affiliated technical field

The utility model relates to a kind of rotary blower of forced conveyance gas, particularly a kind of positive displacement Roots blower.

Background technique

Roots blower essential structure traditionally all is the rotor that is provided with two 8 fonts, through the synchromesh gear transmission, because the process of intake and exhaust is to carry out operation discontinuously, periodically, formed airspeed and pressure are pulsed, thereby have produced bigger aerodynamic noise.In recent years have the trilobal cross Roots blower in the world, chassis cavity is divided into a plurality of element volumes, make the intake and exhaust pulsation mild, effective to reducing noise, but the driven wheel that two rotors drive is when rotated, and its engagement line style is an involute-type, can not fully fully mesh, caused certain internal leakage, simultaneously, gas and noise are still high.

Summary of the invention

The utility model is to provide the Roots blower that a kind of utilization efficiency is higher, noise is lower for the deficiency that overcomes above existing product.

The technological scheme that the utility model is taked is: the utility model comprises left wallboard and the right wallboard that is fixed on the left and right two ends of casing, the gear-box that is fixed on the left wallboard outside etc., pass engagement and counterrotating with a gap under the drive of the synchromesh gear of master and slave moving axis in gear-box of chassis cavity, initiatively impeller and driven impeller are separately fixed on the master and slave moving axis; Driving and driven impeller engagement line style is a circular arc line, and initiatively impeller and driven impeller are at linear each other the interior enveloping outer enclosure each other of engagement place circular arc.

The beneficial effects of the utility model are: because driving and driven impeller engagement line style adopts circular arc line, its engagement process reduces internal leakage more fully fully greatly, has improved air quantity, reduces gas and noise simultaneously, has improved the efficient of complete machine.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the utility model internal view.

Fig. 2 is the sectional view of Fig. 1 on the A-A direction.

In Fig. 1, Fig. 2: 1. casing, 2. driving shaft, 3. impeller initiatively, 4. driven shaft, 5. driven impeller, 6. gear-box, 7. left wallboard, 8. right wallboard, 9. noise reduction groove, 10. gear.

Embodiment

As shown in Figure 1, the left and right sides of casing 1 is fixed with two end cap, be respectively left wallboard 7 and right wallboard 8, gear-box 6 is fixed on left wallboard 7 outsides, pass driving shaft 2 and driven shaft 4 in casing 1 inner chamber, the motor of peripheral hardware drives driving shaft 2 by belt wheel or coupling makes driving shaft 2 and driven shaft 4 be counterrotating with a pair of synchromesh gear 10 that is arranged in gear-box 6.

As shown in Figure 2, the active impeller 3 and the driven impeller 5 that are separately fixed on driving shaft 2 and the driven shaft 4 are all trilobal cross, are symmetrically distributed 120 ° each other of three leaf angles on the plane axial perpendicular to it, guaranteed initiatively impeller 3 and driven impeller 5 dynamic balancing when rotated, fan vibration is atomic little.

Initiatively impeller 3 and driven impeller 5 are circular arc in blade place profile, and its external diameter B is 60～68mm, and preferred design becomes 63.358mm.With impeller central point O is the center of circle, central point C1, C2, C3 place diameter of a circle by three blade profile circular arcs are 120～130mm, the optimal design size is 125mm, like this, initiatively impeller 3 and driven impeller 5 clearance meshing line styles are circular arc line, and each other interior enveloping outer enclosure each other, and two impellers are fully fully meshed, internal leakage is reduced greatly, improved air quantity.

Between active impeller 3 and driven impeller 5, initiatively impeller 3 and driven impeller 5 respectively and between the casing 1, initiatively impeller 3 and driven impeller 5 have all kept certain clearance respectively and between left wallboard 7 and the right wallboard 8, can not collide when making

active impeller

3 and 5 rotations of driven impeller with other part, thereby can run up and do not need internal lubrication, its gap design can obtain bigger air quantity between 0.07～0.18mm.

The noise reduction groove 9 of several U types of design on casing 1 internal chamber wall, noise reduction groove 9 preferred design are in the inner chamber Lower Half of casing 1, U type groove number is best 2～4 effects, can make pressurized gas in casing 1 inner chamber make the buffering of appropriateness at this noise reduction groove 9 places, so as not to high pressure draught since the internal leakage that flow-reversing impingement causes complete machine greatly and noise big.

Claims

1. a Roots blower comprises the left wallboard (7) and the right wallboard (8) that are fixed on the left and right two ends of casing (1); Be fixed on the gear-box (6) in left wallboard (7) outside etc., pass engagement and counterrotating with a gap under the drive of driving shaft (2), the synchromesh gear (10) of driven shaft (4) in gear-box (6) of casing (1) inner chamber, initiatively impeller (3) and driven impeller (5) are separately fixed on driving shaft (2) and the driven shaft (4), it is characterized in that: described active impeller (3) and driven impeller (5) engagement line style is a circular arc line, and initiatively impeller (3) and driven impeller (5) are at engagement place circular arc line each other interior enveloping outer enclosure each other.

2. Roots blower according to claim 1 is characterized in that: described active impeller (3) and driven impeller (5) are the trilobal cross impeller, are symmetrically distributed on the plane axial perpendicular to it respectively.

3. Roots blower according to claim 2, it is characterized in that: described active impeller (3) and driven impeller (5) are 60～68mm at the external diameter B of blade place, with impeller central point O is the center of circle, and central point C1, C2, C3 place diameter of a circle by three blade external arc are 120～130mm.

4. Roots blower according to claim 1 is characterized in that: between described active impeller (3) and the driven impeller (5); Initiatively impeller (3) and driven impeller (5) are respectively and between the casing (1); Initiatively impeller (3) and driven impeller (5) are respectively and the gap that has all kept 0.07～0.18mm between left wallboard (7) and the right wallboard (8).

5. Roots blower according to claim 1 is characterized in that: the internal chamber wall of described casing (1) is provided with the noise reduction groove (9) of several U types.