CN209959525U - Centrifugal blower exhaust volute and centrifugal blower thereof - Google Patents

Abstract

The utility model discloses a centrifugal blower exhaust spiral case and centrifugal blower thereof, include spiral case rotation axis hole that passes through bearing installation connection with centrifugal blower rotation main shaft, the induction port that communicates with centrifugal blower impeller gas outlet, the gas vent that communicates with outside gas transmission pipeline, the induction port with the gas vent communicates through the spiral case passageway that is the spiral case shape, the spiral case passageway includes integrative lower spiral case conch wall, both sides spiral case conch wall and the last spiral case wall of connecting, lower spiral case wall is in same circumference ratio, wherein, both sides spiral case conch wall and last spiral case wall all are circular arc curved surface shape, and the sectional area of spiral case passageway increases according to the area growth rate of presetting; the utility model discloses a carry out special structural design to the spiral case that exhausts, can obviously improve centrifugal blower's pneumatic efficiency, effectively reduce its pneumatic noise simultaneously.

Description

Centrifugal blower exhaust volute and centrifugal blower thereof

Technical Field

The utility model belongs to centrifugal blower product manufacturing field, concretely relates to centrifugal blower spiral case that exhausts, the utility model discloses still relate to the centrifugal blower that this centrifugal blower spiral case that exhausts used.

Background

The working principle of the centrifugal blower is mainly that a plurality of rotating impellers are utilized to do work on gas, the kinetic energy of the gas is increased, and then the pressure of the gas is improved through the centrifugal action and the diffusion process, so that certain air volume and air pressure are achieved, and the technical effect of large-flow high-pressure air supply is achieved. The centrifugal blower has better high-flow high-pressure air supply effect, so the centrifugal blower is widely applied to the fields of sewage treatment, power plant desulfurization and other industries.

In the prior art, the centrifugal blower mainly comprises a rotating main shaft in transmission connection with a rotating driving unit, an air inlet shell integrally connected with the rotating main shaft, an impeller arranged in a middle shell, an air outlet shell and other structures. Particularly for a multi-stage centrifugal blower product, the air outlet housing is responsible for collecting compressed air behind the diffuser or behind the impeller and guiding the compressed air to the air conveying pipeline behind the centrifugal blower.

In the exhaust volute in the prior art, the lower volute wall of the exhaust volute generally adopts the same circumferential curvature, the volute walls on two sides of the exhaust volute keep a plane shape, and then a certain volute channel area growth rate is set for the upper volute wall to form the volute shape, however, based on years of development experience in the field of fan products and theoretical knowledge of fluid flow mechanism, the inventor of the application finds that the volute structure in the prior art has negative effects on the aspects of separation of a flow boundary layer, generation and aggregation of internal vortex masses, position and size of a backflow area and the like, and further can cause the efficiency reduction of a centrifugal pneumatic blower, and further increases the aerodynamic noise; accordingly, applicants desire to achieve higher aerodynamic efficiency of a centrifugal blower while reducing aerodynamic noise through an innovative structural design of the centrifugal blower exhaust volute.

Disclosure of Invention

In view of this, the present invention provides an exhaust volute of a centrifugal blower and a centrifugal blower thereof, which can significantly improve the pneumatic efficiency of the centrifugal blower and effectively reduce the pneumatic noise thereof by performing a special structural design on the exhaust volute.

The utility model adopts the technical scheme as follows:

the utility model provides a centrifugal blower exhaust spiral case, includes the spiral case rotation axis hole of passing through bearing erection joint with the rotatory main shaft of centrifugal blower, the induction port that communicates with centrifugal blower impeller gas outlet, the gas vent that communicates with outside gas transmission pipeline, the induction port with the gas vent is through the spiral case passageway intercommunication that is the spiral case shape, the spiral case passageway includes lower spiral case conch wall, both sides spiral case conch wall and the last spiral case wall of body coupling, the spiral case wall is in same circumference ratio down, wherein, both sides spiral case conch wall all is circular arc curved surface shape with last spiral case wall, just the sectional area of spiral case passageway increases according to preset's area growth rate.

Preferably, the centrifugal blower exhaust volute is integrally cast and formed by aluminum alloy.

Preferably, the centrifugal blower comprises a rotating main shaft in transmission connection with a rotating driving unit, an air inlet shell integrally installed and connected with the rotating main shaft, a multi-stage impeller installed in a middle shell, and an air outlet shell, wherein the air outlet shell adopts the centrifugal blower exhaust volute; the impeller comprises an impeller disc and a plurality of blades, the impeller disc is integrally cast and formed by aluminum alloy materials, the blades are located on the impeller disc, each blade is uniformly distributed on the inner periphery of the impeller disc, an impeller rotating shaft hole fixedly installed and connected with the rotating main shaft, an axial air inlet communicated with an air inlet channel and a radial air inlet communicated with an air outlet channel are formed in the impeller disc, and a sealing surface in a sawtooth labyrinth shape is arranged on the periphery, close to the axial air inlet, of the impeller disc.

The predetermined area growth rate according to the present invention may be specifically set according to the common general knowledge of those skilled in the art, and the present invention is not particularly limited thereto.

The volute wall on the two sides and the upper volute wall are both in the shape of the arc curved surface, and under the shape, the sectional area of the volute channel is increased according to the preset area increasing rate; the volute channel structure design in the shape of the arc curved surface can effectively control airflow collection, downstream rotation, gradual pressure rise and guide airflow to enter an external gas transmission pipeline, and through experimental detection, compared with the exhaust volute structure in the prior art, the utility model has the advantages that the pneumatic efficiency is improved by about 4 percent, and the pneumatic noise is reduced by 5 dBA;

the utility model discloses still further preferably provided and set up the sealed face that is sawtooth labyrinth form in the impeller dish periphery that is close to axial air inlet department, this sealed face can realize showing the gas leakage who reduces between impeller and the middle part casing to the labyrinth of impeller, and then can improve simultaneously the utility model discloses centrifugal blower's sealing performance.

Drawings

FIG. 1 is a schematic structural view of an exhaust volute of a centrifugal blower according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a partially schematic view of a fully assembled cross-section of the centrifugal blower exhaust volute at every 45 ° angle interval according to the embodiment of the present invention;

FIG. 4 is a schematic structural view of a centrifugal blower according to an embodiment of the present invention;

FIG. 5 is a front sectional view of an impeller according to an embodiment of the present invention

Fig. 6 is an enlarged view of the structure at a in fig. 5.

Detailed Description

The embodiment of the utility model discloses centrifugal blower spiral case that exhausts, include the spiral case rotation axis hole that passes through bearing erection joint with centrifugal blower rotary main shaft, the induction port with centrifugal blower impeller gas outlet intercommunication, the gas vent with outside gas transmission pipeline intercommunication, induction port and gas vent are through the spiral case passageway intercommunication that is the spiral case shape, the spiral case passageway includes the lower spiral case conch wall of a body coupling, both sides spiral case conch wall and last spiral case wall, lower spiral case wall is in same circumference ratio, wherein, both sides spiral case conch wall all is the circular arc curved surface shape with last spiral case wall, and the sectional area of spiral case passageway increases according to preset's area growth rate.

The embodiment of the utility model also discloses a centrifugal blower, which comprises a rotating main shaft in transmission connection with the rotating driving unit, an air inlet shell, a multi-stage impeller and an air outlet shell, wherein the air inlet shell is integrally installed and connected with the rotating main shaft, the multi-stage impeller is installed in the middle shell, and the air outlet shell adopts the centrifugal blower exhaust volute; the impeller comprises an impeller disc and a plurality of blades, the impeller disc is integrally cast and formed by aluminum alloy materials, the blades are located on the impeller disc, each blade is uniformly distributed on the inner periphery of the impeller disc, an impeller rotating shaft hole fixedly installed and connected with the rotating main shaft, an axial air inlet communicated with the air inlet channel and a radial air inlet communicated with the air outlet channel are formed in the impeller disc, and a sealing surface in a sawtooth labyrinth shape is arranged on the periphery, close to the axial air inlet, of the impeller disc.

The volute wall on the two sides and the upper volute wall are both in the shape of the arc curved surface, and under the shape, the sectional area of the volute channel is increased according to the preset area increasing rate; this spiral case channel structure design that is circular arc curved surface shape can effective control airflow collection, following current rotation, step-by-step boost, guide air current entering outside gas transmission pipeline, detect through the experiment, the utility model discloses for prior art's exhaust spiral case structure, pneumatic efficiency improves about 4%, and pneumatic noise reduces 5 dBA.

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Referring to fig. 1 and 2, an exhaust volute 100 of a centrifugal blower includes a volute rotation shaft hole 110 connected to a rotation shaft of the centrifugal blower through a bearing, an air inlet (not shown) connected to an air outlet of an impeller of the centrifugal blower, and an air outlet 120 connected to an external air duct, the air inlet and the air outlet 120 are connected to each other through a volute channel 130 in a shape of a volute, the volute channel 130 includes a lower volute wall 131, two volute walls 132, and an upper volute wall 133 that are integrally connected, and the lower volute wall 134 is located at a same circumferential ratio, wherein, referring to a partial schematic view of a total cross section of the exhaust volute 100 of the centrifugal blower of this embodiment at an angle of 45 ° shown in fig. 3, the cross section is a partial cross section of the lower volute 131 as a reference plane and performed for the two volute walls 132 and the upper volute wall 133, the volute walls 132 and 133 on both sides are in the shape of a circular arc curved surface, and the sectional area of the volute channel 130 is increased according to a preset area increase rate;

preferably, the centrifugal blower exhaust volute 100 in the present embodiment is integrally cast and formed by aluminum alloy, which is beneficial to manufacturing;

preferably, referring further to fig. 4, a centrifugal blower 10 includes a rotary spindle 11 in transmission connection with a rotary driving unit (not shown), an air inlet housing 12 integrally installed with the rotary spindle 11, a multi-stage impeller 14 (not shown in fig. 4) installed in a middle housing 13, and an air outlet housing, the air outlet housing adopts the centrifugal blower exhaust volute 100 as described above; as further shown in fig. 5 and fig. 6, the impeller 14 includes an impeller disk 141 integrally cast and formed by an aluminum alloy material, and a plurality of blades 142 located on the impeller disk 141, each blade 142 is uniformly distributed on an inner periphery of the impeller disk 141, the impeller disk 141 is provided with an impeller rotation shaft hole 141a fixedly mounted and connected with the rotation main shaft 11, an axial air inlet 141b communicated with the air inlet channel, and a radial air inlet 141c communicated with the air outlet channel, wherein a sealing surface 143 in a zigzag shape is provided on an outer periphery of the impeller disk 141 near the axial air inlet 141 b.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (3)

1. The utility model provides a centrifugal blower exhaust spiral case, includes the spiral case rotation axis hole of passing through bearing installation connection with the centrifugal blower rotation main shaft, the induction port with centrifugal blower impeller gas outlet intercommunication, the gas vent with outside gas transmission pipeline intercommunication, the induction port with the gas vent is through the spiral case passageway intercommunication that is the spiral case shape, its characterized in that, the spiral case passageway includes the lower spiral case conch wall, both sides spiral case conch wall and the last spiral case wall of body coupling, the spiral case wall is in same circumference ratio down, wherein, both sides spiral case conch wall all are the circular arc curved surface shape with last spiral case wall, just the sectional area of spiral case passageway increases according to the area growth rate of presetting.

2. The centrifugal blower discharge volute of claim 1, wherein said centrifugal blower discharge volute is integrally cast from an aluminum alloy.

3. A centrifugal blower, comprising a rotary main shaft in transmission connection with a rotary driving unit, an air inlet housing integrally mounted with the rotary main shaft, a multi-stage impeller mounted in a middle housing, and an air outlet housing, wherein the air outlet housing adopts a centrifugal blower exhaust volute according to any one of claims 1-2; the impeller comprises an impeller disc and a plurality of blades, the impeller disc is integrally cast and formed by aluminum alloy materials, the blades are located on the impeller disc, each blade is uniformly distributed on the inner periphery of the impeller disc, an impeller rotating shaft hole fixedly installed and connected with the rotating main shaft, an axial air inlet communicated with an air inlet channel and a radial air inlet communicated with an air outlet channel are formed in the impeller disc, and a sealing surface in a sawtooth labyrinth shape is arranged on the periphery, close to the axial air inlet, of the impeller disc.

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