CN209959559U

CN209959559U - Centrifugal blower impeller with anti-surge capacity and centrifugal blower thereof

Info

Publication number: CN209959559U
Application number: CN201920694160.9U
Authority: CN
Inventors: 宋波; 雷先华; 庄贤良
Original assignee: JIANGSU CHINFAN COMPRESSOR Inc
Current assignee: JIANGSU CHINFAN COMPRESSOR Inc
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-01-17
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses a centrifugal blower impeller with anti-surge capacity and a centrifugal blower thereof, the centrifugal blower impeller adopts an impeller disc which is integrally cast and formed by aluminum alloy materials and a plurality of blades which are positioned on the impeller disc, each blade is uniformly distributed on the inner periphery of the impeller disc, and the impeller disc is provided with a rotating shaft hole which is fixedly installed and connected with a rotating main shaft of the centrifugal blower, an axial air inlet which is communicated with an air inlet channel and a radial air inlet which is communicated with an air outlet channel; wherein, each blade adopts a backward blade with large backswept, the air outlet angle range of the blade is 60-80 degrees, and the number of the blades is 12; the periphery of the impeller disc close to the axial air inlet is provided with a sawtooth labyrinth-shaped sealing surface; the utility model discloses a carry out special structural design to the impeller, can obviously improve the anti surge ability and the sealing performance of the centrifugal blower who adopts backward formula impeller structure.

Description

Centrifugal blower impeller with anti-surge capacity and centrifugal blower thereof

Technical Field

The utility model belongs to centrifugal blower product manufacturing field, concretely relates to centrifugal blower impeller with anti-surge ability, the utility model discloses this centrifugal blower who uses of centrifugal blower impeller with anti-surge ability has still been related to.

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 casing integrally installed with the rotating main shaft, an impeller installed in a middle casing, an air outlet casing and other structures, and the shape and the number of blades on the impeller and the shape of a blade disc are core factors determining the pneumatic efficiency of the centrifugal blower. In order to meet the performance requirements of various fields, people usually design blades of an impeller of a centrifugal blower into a backward type, a forward type and a radial type, wherein the bending direction of the backward type blades is the same as the motion trail of gas, and the backward type blades are widely used due to the advantages of high pneumatic efficiency and low noise, however, the gas outlet angle of the backward type blades is generally set to be 50-60 degrees, the rotating deflection angle of gas flow entering a pressure expansion area is reduced, and the anti-surge capacity of the centrifugal blower is poor; but also the installation and sealing performance of the middle shell are greatly challenged.

Based on years of development experience in the field of fan products and theoretical knowledge of fluid flow mechanisms, the inventor hopes to improve the anti-surge capacity and the sealing performance of a backward impeller structure and a centrifugal fan adopting the backward impeller structure by carrying out innovative structural design on the centrifugal fan impeller.

Disclosure of Invention

In view of this, the present invention provides a centrifugal blower impeller with anti-surge capability and a centrifugal blower thereof, which can significantly improve the anti-surge capability and sealing performance of the centrifugal blower adopting a backward impeller structure by designing the impeller with a special structure.

The utility model adopts the technical scheme as follows:

the centrifugal blower impeller is characterized in that an impeller disc which is integrally cast and formed by adopting an aluminum alloy material and a plurality of blades which are positioned on the impeller disc are adopted, each blade is uniformly distributed on the inner periphery of the impeller disc, and the impeller disc is provided with a rotating shaft hole which is fixedly installed and connected with a rotating main shaft of the centrifugal blower, an axial air inlet which is communicated with an air inlet channel and a radial air inlet which is communicated with an air outlet channel; each blade adopts a backward blade with large backswept, the air outlet angle of the blade ranges from 60 degrees to 80 degrees, and the number of the blades is 12; the periphery of the impeller disc close to the axial air inlet is provided with a sawtooth labyrinth-shaped sealing surface.

Preferably, the air outlet angle of the blade is in the range of 70-80 °.

Preferably, the inner wall of the rotating shaft hole is provided with a plurality of hollow weight-reducing grooves which are uniformly distributed at intervals.

Preferably, the centrifugal blower with the anti-surge capacity 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 impeller is the centrifugal blower impeller with the anti-surge capacity.

The utility model can effectively correct the airflow angle in the rotation direction of the impeller by arranging the large sweepback type blade with the air outlet angle ranging from 60 degrees to 80 degrees, thereby reducing the airflow rotation deflection angle entering the pressure expansion area of the impeller, increasing the margin of the rotating stall and finally effectively improving the surge resistance of the centrifugal blower; simultaneously the utility model provides a periphery setting that is close to axial air inlet department at the impeller dish is the sealed face that is sawtooth labyrinth form, and 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 front cross-sectional view of a centrifugal blower impeller having anti-surge capability in accordance with an embodiment of the present invention;

FIG. 2 is a side cross-sectional view of a centrifugal blower impeller having anti-surge capability in accordance with an embodiment of the present invention;

FIG. 3 is a front cross-sectional view of a centrifugal blower impeller rotation shaft hole having anti-surge capability in accordance with an embodiment of the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 2 at A;

FIG. 5 is a schematic front view of a backward blade with large sweep according to an embodiment of the present invention;

FIG. 6 is a schematic side view of a backward blade with large sweep in an embodiment of the present invention;

fig. 7 is a partial cross-sectional view of a centrifugal blower in accordance with an embodiment of the present invention.

Detailed Description

The embodiment of the utility model discloses a centrifugal blower impeller with anti-surge capacity, which adopts an impeller disc integrally cast and formed by aluminum alloy materials and a plurality of blades positioned on the impeller disc, each blade is uniformly distributed on the inner periphery of the impeller disc, and the impeller disc is provided with a rotating shaft hole fixedly installed and connected with a rotating main shaft of the centrifugal blower, an axial air inlet communicated with an air inlet channel and a radial air inlet communicated with an air outlet channel; wherein, each blade adopts a backward blade with large backswept, the air outlet angle range of the blade is 60-80 degrees, and the number of the blades is 12; the periphery of the impeller disc close to the axial air inlet is provided with a sawtooth labyrinth-shaped sealing surface.

The embodiment of the utility model provides a centrifugal blower with anti surge ability is still disclosed, include the rotary main shaft of being connected with the transmission of rotary drive unit, with rotary main shaft erection joint casing that admits air as an organic whole, install the multistage impeller in the middle part casing, the casing of giving vent to anger, the impeller adopts as above centrifugal blower impeller with anti surge ability.

The embodiment of the utility model provides a through setting up the big sweepback formula blade of giving vent to anger angle range at 60-80, can effectively correct the air current angle of impeller direction of rotation, and then make the air current rotation declination that gets into the impeller diffusion district reduce, increase the margin of rotatory stall, finally effectively improve the anti-surge's of the centrifugal blower of the embodiment of the utility model; simultaneously the embodiment of the utility model provides a periphery setting that is close to axial air inlet department at the impeller dish is provided and is the sealed face of sawtooth labyrinth form, and 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 provides a centrifugal blower's sealing performance.

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 impeller disc 110 integrally cast and formed by an aluminum alloy material and a plurality of blades 120 located on the impeller disc 110 are shown, each blade 120 is uniformly distributed on the inner circumference of the impeller disc 110, and the impeller disc 110 is provided with a rotating shaft hole 111 fixedly connected with a rotating main shaft of the centrifugal blower, an axial air inlet 112 communicated with an air inlet channel, and a radial air inlet 113 communicated with an air outlet channel;

preferably, as further shown in fig. 3, in the present embodiment, the inner wall of the rotating shaft hole 111 is provided with a plurality of hollow weight-reducing grooves 130 uniformly distributed at intervals, and the hollow weight-reducing grooves 130 are all fan-shaped to ensure that the hollow weight-reducing grooves 130 are located on the same circumferential surface; preferably, in the present embodiment, the number of the hollow weight-reducing grooves 130 is 6, and the caliber of the groove root 130a of each hollow weight-reducing groove 130 is larger than that of the notch 130b thereof; further specifically, preferably, in the present embodiment, the caliber of the groove root 130a of each hollow weight-reducing groove 130 is 1.2 to 1.6 times the caliber of the notch 130b thereof;

preferably, as further shown in fig. 4, in the present embodiment, the outer periphery of the impeller disk 110 near the axial air inlet 112 is provided with a sealing surface 114 in the shape of a sawtooth labyrinth, which can significantly reduce the air leakage between the impeller 100 and the middle housing and improve the sealing performance;

as shown in fig. 5 and fig. 6, in the present embodiment, each blade 120 is a backward blade with a large sweep, the air outlet angle of the blade 120 is in the range of 60-80 °, and the number of the blades 120 is 12; further preferably, the outlet angle of the blades 120 ranges from 70 to 80 °;

preferably, referring to fig. 7, the present embodiment further provides a centrifugal blower 10 with anti-surge capability, which includes a rotary spindle 11 drivingly connected to a rotary driving unit (not shown), an air inlet housing 12 integrally installed with the rotary spindle 11, a multi-stage impeller installed in a middle housing 13, and an air outlet housing 14, wherein the impeller is the centrifugal blower impeller 100 with anti-surge capability as described above in the present embodiment.

The present embodiment creatively proposes that the inner wall of the rotating shaft hole 111 on the impeller disc 110 is provided with a plurality of hollow weight-reducing grooves 130, and the design structure effectively reduces the weight of the impeller 100 on the premise of not affecting the installation positioning and the structural strength of the impeller 100, and has significant effects on reducing the energy consumption and the rotational inertia of the centrifugal blower 10 and reducing the cost of parts.

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

1. The centrifugal blower impeller with the anti-surge capacity is characterized in that an impeller disc which is integrally cast and formed by aluminum alloy materials and a plurality of blades which are positioned on the impeller disc are adopted, each blade is uniformly distributed on the inner periphery of the impeller disc, and a rotating shaft hole which is fixedly installed and connected with a rotating main shaft of a centrifugal blower, an axial air inlet which is communicated with an air inlet channel and a radial air inlet which is communicated with an air outlet channel are arranged on the impeller disc; each blade adopts a backward blade with large backswept, the air outlet angle of the blade ranges from 60 degrees to 80 degrees, and the number of the blades is 12; the periphery of the impeller disc close to the axial air inlet is provided with a sawtooth labyrinth-shaped sealing surface.

2. The centrifugal blower impeller with antisurge capability of claim 1, wherein said blades have an outlet angle in the range of 70-80 °.

3. The centrifugal blower impeller with anti-surge capability of claim 1, wherein the inner wall of said rotating shaft hole is provided with a plurality of hollow weight-reducing grooves spaced uniformly.

4. A centrifugal blower with anti-surge capacity, 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 impeller is the centrifugal blower impeller with anti-surge capacity according to any one of claims 1 to 3.