CN203847386U - Roots blower - Google Patents

Abstract

The utility model relates to a Roots blower which comprises a shell, a vane wheel, an air inlet, an air outlet and an involute type buffering air groove, wherein the buffering air groove is arranged at two sides of the air inlet side in the shell and changes from small to large and from shallow to deep; the large end of the buffering air groove is arranged at the air outlet side. The Roots blower is characterized in that when the vane wheel gets close to the air outlet, as the section area of the involute type buffering air groove is gradually formed from small to large, the communicating flow rate between a pressure cavity and the air outlet changes from small to large, the pressure at the air outlet and the pressure in the cavity are gradually balanced, so as to avoid pressure fluctuation generated by the backflow impact of high-pressure air in an exhaust opening when the pressure in the cavity is suddenly reduced, thus the vibration and noise are reduced.

Description

A kind of Roots blower

(1) technical field

The utility model relates to a kind of blower, particularly a kind of Roots blower.

(2) background technique

Current Roots blower, when the moment of impeller operation to exhaust port pressure chamber and casing exhaust port UNICOM, exhaust port and shell internal pressure chamber suddenly large aperture UNICOM, flow-reversing impingement build-up of pressure pulsation in exhaust port, the generation periodic vibration that goes round and begins again is the importance that Roots blower produces noise.

(3) model utility content

The purpose of this utility model is to overcome the problems referred to above of prior art and a kind of Roots blower little, noise is low that shakes is provided.

The technological scheme that realizes the utility model object is: it comprises casing, impeller, intake grill, exhaust outlet, and in casing, the both sides of exhaust outlet one side also have by little increasing, by shallow intensification, large end, are positioned at exhaust outlet gradually open form buffering wind groove on one side.

In order better to realize its object, gradually open form buffering wind groove is half cone-shaped groove.

Gradually open form buffering wind groove can also be Mitsubishi's taper, or along impeller shaft to be radially asymmetric geometrical shape etc., as long as guarantee that its aperture increases gradually.Its speed increasing is gradually according to compressor flow and boost definite.R in Fig. 2,3 and β represent the speed that gradually open form buffering wind groove increases gradually, according to compressor flow and the situation of boosting, determine.

Due to said structure of the present utility model, when blower wheel does not also arrive exhaust outlet, pressure chamber is just connected with exhaust outlet, start pressure release, because the buffering of open form gradually wind slot cross-section is long-pending ascending, progressively form, pressure chamber and exhaust outlet UNICOM flow are ascending, and exhaust outlet and cavity pressure be balance and avoid pressure in pressure cavity to reduce suddenly progressively, high-pressure blast flow-reversing impingement in relief opening produces pressure surge, thereby reduces vibrations and noise.

(4) accompanying drawing explanation

Fig. 1 is the utility model schematic top plan view;

Fig. 2 is the A-A cross-sectional schematic in the utility model Fig. 1;

Fig. 3 is the B-B cross-sectional schematic in the utility model Fig. 2;

Fig. 4 is the C-C cross-sectional schematic in the utility model Fig. 3.

(5) embodiment

Below in conjunction with accompanying drawing, be described further, but be not limited only to this.

As shown in Figure 1,2,3, 4, it comprises casing 1, impeller 2, intake grill 3, exhaust outlet 4 the utility model, has by little increasing, by shallow intensification, large end, is positioned at gradually open form buffering wind groove 5 of exhaust outlet half-conical on one side on the both sides of interior exhaust outlet 4 one sides of casing 1.

Claims (2)

1. a Roots blower, comprise casing (1), impeller (2), intake grill (3), exhaust outlet (4), it is characterized in that: the both sides of exhaust outlet (4) one sides have by little increasing, by shallow intensification, large end, are positioned at exhaust outlet gradually open form buffering wind groove (5) on one side in casing (1).

2. Roots blower according to claim 1, is characterized in that: gradually open form buffering wind groove (5) is circular arc cone tank.