CN217558628U

CN217558628U - Air inlet of centrifugal ventilator

Info

Publication number: CN217558628U
Application number: CN202221000550.XU
Authority: CN
Inventors: 裘霖富; 徐天赐
Original assignee: Zhejiang Kemao Intelligent Electromechanical Co ltd
Current assignee: Zhejiang Kemao Intelligent Electromechanical Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-10-11
Anticipated expiration: 2032-04-28

Abstract

The utility model discloses a centrifugal fan's air intake, it includes the through-flow part, the through-flow part includes front end contraction section "abc" and rear end expansion section "cef", front end contraction section "abc" links up rear end expansion section "cef", does not have under the condition that changes at the relative position between air intake and impeller, rear end expansion section "cef" is the anti-bow expansion type for through-flow area after the air intake throat obviously increases, and the air current slows down more fully, thereby makes the main air current before getting into the impeller more steady, is favorable to improving the aerodynamic parameter and the aerodynamic efficiency of ventilation blower, and reduces the noise of admitting air.

Description

Air inlet of centrifugal ventilator

Technical Field

The utility model relates to a centrifugal fan field, concretely relates to centrifugal fan's air intake.

Background

The main body of the through-flow part of the centrifugal ventilator mainly comprises an impeller, a shell and an inlet collector (namely an air inlet), wherein the air inlet is used as a component of the centrifugal ventilator and is a static flow guide part which is used for guiding axial air inflow into the impeller. The structural form of the air inlet, particularly the arc shape of the cross section of the air inlet directly influences the shape of air flow entering the impeller, such as the smoothness of inlet air flow and air inlet noise.

Generally, the air inlet of the centrifugal fan has a cylindrical shape, a conical shape, a circular arc shape and a conical arc shape. For a low-pressure backward centrifugal ventilator, an air inlet of the low-pressure backward centrifugal ventilator is mostly in a high-efficiency conical arc shape, and a through-flow part of the conical arc-shaped air inlet consists of an inlet contraction section and an outlet expansion section, namely, airflow in the air inlet is accelerated and then decelerated along the direction of a central axis.

In recent years, many people pay attention to and pay attention to the air inlet of the ventilator, and the air inlet, the impeller and the shell are regarded as a part of the whole ventilator through-flow, so that a high-efficiency air inlet part is obtained to optimize the airflow state of the impeller inlet, further improve the performance parameters and the pneumatic efficiency of the ventilator, reduce energy consumption and noise, and become one of the important research objects of the people in the industry.

SUMMERY OF THE UTILITY MODEL

Based on the aforesaid for obtaining efficient air intake part to optimize impeller entry air current state, thereby further improve ventilation blower performance parameter, aerodynamic efficiency, reduce the purpose of energy consumption and noise, and for reaching above-mentioned purpose, the utility model provides a centrifugal fan's air intake to propose following technical scheme:

the utility model provides a centrifugal fan's air intake, it includes the through-flow part, the through-flow part includes front end contraction section "abc" and rear end expansion section "cef", front end contraction section "abc" links up rear end expansion section "cef", rear end expansion section "cef" is the anti-bow expansion type.

Further, rear end expansion section "cef" divide into "ce" section pitch arc and "ef" section pitch arc, "ce" section pitch arc links up "ef" section pitch arc, it is protruding to axle center direction "ce" section pitch arc, "ef" section pitch arc is protruding to keeping away from axle center direction, the protruding direction of "ce" section pitch arc with the protruding opposite direction of "ef" section pitch arc, form the S type.

Further, the diameter at the "c" point is the smallest, which is the throat of the air inlet.

Furthermore, the diameter of the air inlet is phi D _in Diameter of throat portion is phi D _h Outlet diameter of phi D _out ，φD _in ＞φD _out ＞φD _h 。

Further, the axial distance from the inlet flange face of the air inlet to the throat part is L _S The axial distance from the throat part to the outer end part of the outlet is L _K ，L _S ＞L _K 。

Further, the "ce" arc is tangent to the "bc" arc and is tangent to the "ef" arc.

The utility model provides a pair of centrifugal fan's an aim at of air intake improves the water conservancy diversion efficiency of air intake to the air current of low pressure backward centrifugal fan.

The utility model provides a pair of another aim at of centrifugal fan's air intake reduces the flow loss that the entry came and improves impeller export flow and pressure and ventilation blower pneumatic efficiency.

The utility model provides a pair of another aim at S-shaped ' S of centrifugal fan ' S air intake anti-bow expansion shape ' S setting is compared with protruding convex arc in, and the through flow area after the air intake throat obviously increases, and the air current slows down more fully promptly for main air current before getting into the impeller is more steady, is favorable to improving the aerodynamic performance parameter and the aerodynamic efficiency of ventilation blower, and reduces the noise of admitting air.

The utility model provides a pair of another aim at of centrifugal fan's air intake is anti-bow shape's setting, has blocked the space that the positive pressure gas flow of impeller export to air intake periphery space flows back in to the impeller through the clearance between impeller and the air intake to a certain extent, has avoided the possibility of the leakage of ventilation blower to a certain extent promptly, has improved ventilation blower aerodynamic performance and efficiency.

Drawings

FIG. 1 is a schematic view of a prior art backward centrifugal fan (1 is an air inlet, and 2 is an impeller);

FIG. 2 is a schematic view of a prior art conical arc intake;

fig. 3 is a schematic view of a conical arc-shaped air inlet according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of part I of the embodiment of the present invention;

fig. 5 is a schematic perspective view of an air inlet according to an embodiment of the present invention;

FIG. 6 is a schematic diagram showing a comparison of the outlet of the divergent section of the air inlet with two kinds of arc shapes in cross section;

fig. 7 is a static pressure comparison graph of the first embodiment of the present invention and the first comparison sample machine;

fig. 8 is a graph comparing the static pressure efficiency of the first embodiment of the present invention and the first comparative sample.

Detailed Description

The invention is further described below in conjunction with fig. 1-8 and the detailed description.

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

The utility model provides a centrifugal fan's air intake, it includes the through-flow part, the through-flow part includes front end contraction section "abc" and rear end expansion section "cef", front end contraction section "abc" links up rear end expansion section "cef", rear end expansion section "cef" is anti bow expansion type.

Notably, the leading end convergent section "abc" and the trailing end divergent section "cef" transition through a smooth curve.

Under the general condition, the high-efficient awl arc air intake of centrifugal fan behind the low pressure of big specific speed, its cross sectional shape is the nozzle form, and the anterior segment is the shrink section that the area reduces gradually, and the air current is acceleration state between them, after the air intake throat, enters into the back end, and its area constantly enlarges, and the air current speed gets into the impeller after reducing gradually, and the utility model discloses a preferred embodiment improves the cross sectional shape of air intake export section for the anti-bow of S-shaped expansion shape after, compares with protruding convex arc in with, and the through-flow area after the air intake throat obviously increases, and the air current slows down more fully promptly, can make the main air current before getting into the impeller more steady like this, is favorable to improving the aerodynamic performance parameter and the pneumatic efficiency of ventilation fan to reduce the noise of admitting air.

The air inlet expansion section is in an inverted arch shape, and the part protruding towards the outer periphery blocks the space from the impeller outlet to the air inlet periphery space through the clearance between the impeller and the air inlet to the backflow of the positive pressure air flow into the impeller to a certain extent, so that the risk of leakage in the ventilator is avoided to a certain extent, and the pneumatic performance and efficiency of the ventilator are improved.

In this embodiment, rear end expansion section "cef" divide into "ce" section pitch arc and "ef" section pitch arc, "ce" section pitch arc links up "ef" section pitch arc, "ce" section pitch arc is protruding to axle center direction, "ef" section pitch arc is protruding to keeping away from axle center direction, the protruding direction of "ce" section pitch arc with the arch of "ef" section pitch arcThe direction is opposite, forming an S shape. The diameter at the point "c" is the smallest and is the throat of the air inlet. The diameter of the air inlet is phi D _in Diameter of throat portion is phi D _h Outlet diameter of phi D _out ，φD _in ＞φD _out ＞φD _h . The axial distance from the inlet flange face of the air inlet to the throat part is L _S The axial distance from the throat part to the outer end part of the outlet is L _K ，L _S ＞L _K 。

A "ce" segment arc is tangent to the "bc" segment arc and tangent to the "ef" segment arc.

It is worth mentioning that, compare with prior art, after the cross-section pitch arc of air intake export section set to anti-bow expansion shape, the relative position between air intake and the impeller did not change, therefore ventilation blower complete machine appearance all keeps unchangeable with the installation dimension, simultaneously because the material and the processing technology of air intake are unanimous with the contrast model machine, the utility model discloses simple and easy.

The improvement effect of the preferred embodiment of the utility model, the main performance parameters of the highest efficiency working point of the four embodiments of the utility model and the comparison of the highest efficiency working point of the prototype, the static pressure and static pressure efficiency of the first embodiment of the utility model and the comparison of the highest efficiency working point of the prototype under the same flow rate in the large flow rate interval are taken as the main test directions, wherein the ventilator structure of the four embodiments has different differences on the impeller diameter, the impeller diameters of 332mm, 374mm, 590mm and 664mm are taken as the main parameter points respectively, namely the impeller diameter of the first embodiment is 332mm, the impeller diameter of the second embodiment is 374mm, the impeller diameter of the third embodiment is 590mm, the impeller diameter of the fourth embodiment is 664mm, do following experiment, it needs to explain that, the impeller diameter is prior art, combines the utility model discloses a main structure, anti bow expanding structure promptly for air flow, static pressure efficiency obtain obvious change, reach the utility model discloses required technological effect, and contrast model machine one, contrast model machine two, contrast model machine three, contrast model machine four are prior art, adopt the air intake of original contrast model machine promptly, its through-flow part is nozzle form barrel, and front end convergent section "abc" and rear end divergent section "cf" are constituteed promptly, and wherein "abc" comprises two sections arc "ab" and "bc", and "cf" also is arc to "cf" is to the indent, not the utility model discloses an anti bow expanding structure, the test result is shown as the following table:

1) The utility model discloses a table below is seen in the main performance parameter contrast of the maximum efficiency operating mode point of four kinds of embodiments and contrast model machine thereof:

2) The embodiment of the utility model discloses a static pressure and static pressure efficiency contrast under the same flow of embodiment one and contrast a highest efficiency operating mode point of model machine and large-traffic interval are shown below:

as can be seen from the comparison of the two tables and the performance curve in the figures 7-8, compared with a comparison sample machine, the four embodiments of the utility model have the advantages that under the working condition of highest efficiency, both the static pressure and the static pressure efficiency are obviously improved, and the maximum air volume is also obviously increased; the performance curves of the four improved embodiments are all on the upper right of the original comparison model machine, and the results prove that the output and the efficiency of the ventilator are improved, and the improvement effect is more remarkable in the range of a middle large flow interval.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention can be modified or altered in any way.

It can thus be seen that the objects of the invention have been fully and effectively accomplished. The embodiment has been shown and described in sufficient detail to explain the functional and structural principles of the invention and that changes may be made without departing from such principles. Accordingly, this invention includes all modifications encompassed within the scope and spirit of the following claims.

Claims

1. The air inlet of the centrifugal ventilator is characterized by comprising a through flow part, wherein the through flow part comprises a front end contraction section 'abc' and a rear end expansion section 'cef', the front end contraction section 'abc' is connected with the rear end expansion section 'cef', and the rear end expansion section 'cef' is of a reverse bow expansion type.

2. The air inlet of the centrifugal fan according to claim 1, wherein the rear end expansion section "cef" is divided into a "ce" section arc line and an "ef" section arc line, the "ce" section arc line is connected with the "ef" section arc line, the "ce" section arc line is convex in the axis direction, the "ef" section arc line is convex in the direction away from the axis direction, and the convex direction of the "ce" section arc line is opposite to the convex direction of the "ef" section arc line, so that an S-shaped structure is formed.

3. The intake of a centrifugal fan as claimed in claim 1, wherein the smallest diameter at the "c" point is the throat of the intake.

4. An air inlet of a centrifugal fan according to claim 1, wherein the air inlet has an inlet diameter of phid _in Diameter of throat portion is phi D _h Outlet diameter of phi D _out ，φD _in ＞φD _out ＞φD _h 。

5. The air inlet of the centrifugal fan according to claim 4, wherein the axial distance from the inlet flange face of the air inlet to the throat part is L _S The axial distance from the throat part to the outer end part of the outlet is L _K ，L _S ＞L _K 。