CN105201904A - Method for controlling tip clearance of semi-open impeller - Google Patents
Method for controlling tip clearance of semi-open impeller Download PDFInfo
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- CN105201904A CN105201904A CN201510556996.9A CN201510556996A CN105201904A CN 105201904 A CN105201904 A CN 105201904A CN 201510556996 A CN201510556996 A CN 201510556996A CN 105201904 A CN105201904 A CN 105201904A
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- impeller
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- coating
- current collector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
本发明创造提供一种半开式叶轮叶顶间隙的控制方法，包括以下步骤：(1)首先计算叶轮最大直径处的轴向变形量△D；(2)将叶轮的轮盖面曲线S1沿轴向偏移△D的距离，得到曲线S2；(3)将偏移得到的曲线S2向外等距移动1mm得到曲线S3，曲线S3为集流器基体的内表面轮廓加工曲线；(4)对加工后集流器内表面采取静电喷涂保护涂层，涂层厚度1mm，耐温260℃，使喷涂涂层后最终形成的集流器内表面曲线为S2。本发明创造的有益效果是：集流器与叶轮装配后，叶轮初始旋转将与涂层摩擦，刮去微量涂层，之后叶片与涂层不再摩擦，并保持极小的叶顶间隙。
The invention provides a method for controlling the tip clearance of a semi-open impeller, which includes the following steps: (1) first calculate the axial deformation ΔD at the maximum diameter of the impeller; Axially offset by a distance of △D to obtain curve S2; (3) Move the offset curve S2 outward by 1 mm to obtain curve S3, which is the inner surface contour processing curve of the current collector base; (4) The inner surface of the processed current collector is protected by electrostatic spraying with a coating thickness of 1mm and a temperature resistance of 260°C, so that the final curve of the inner surface of the current collector after spraying the coating is S2. The beneficial effect created by the invention is: after the collector and the impeller are assembled, the impeller will rub against the coating in the initial rotation to scrape off a small amount of coating, and then the blade will no longer rub against the coating, and a very small blade tip clearance will be maintained.
Description
Technical Field
The invention belongs to the field of impellers, and particularly relates to a control method for blade top clearance of a semi-open impeller.
Background
The components of fan devices such as centrifugal blowers and compressors include impellers, collectors (suction chambers), diffusers, volutes, and the like. Wherein the collector and the impeller are used as suction parts, and the assembly clearance of the collector and the impeller directly influences the efficiency of the fan. The inner surface of the current collector is matched with the wheel cover surface of the impeller, the current collector is in clearance fit with the impeller, and the traditional experience requires that the blade top clearance is controlled within five percent of the width of the outlet of the impeller. Due to machining errors and assembly errors, blade tip clearances are usually too large, so that clearance leakage is increased, the boosting capacity of an impeller is weakened, the pressure ratio is reduced, and the efficiency of a fan is reduced.
Disclosure of Invention
The invention aims to reduce the clearance between the blade and the current collector.
In order to solve the technical problems, the invention adopts the technical scheme that:
a control method for blade top clearance of a semi-open type impeller comprises the following steps:
(1) designing and determining the shape and size of the impeller;
(2) calculating the axial deformation quantity delta D at the maximum diameter of the impeller;
(3) shifting a wheel cover surface curve S1 of the impeller by a distance delta D along the axial direction to obtain a curve S2;
(4) moving the curve S2 obtained by shifting the curve along the axial direction outwards at equal intervals by 1mm to obtain a curve S3, and processing the curve S3 as the inner surface contour of the current collector substrate;
(5) and spraying a protective coating on the inner surface of the processed current collector, wherein the thickness of the coating is 1mm, so that the curve of the inner surface of the current collector finally formed after the coating is sprayed is S2.
Preferably, Δ D in step (1) is obtained by simulation calculation using finite element software.
Preferably, the protective coating adopted in the step (5) is a polytetrafluoroethylene coating, and an electrostatic spraying manner is adopted.
The invention has the advantages and positive effects that: .
(1) After the current collector is assembled with the impeller, the impeller initially rotates to rub the coating and scrape off the micro-coating, and then the blade does not rub the coating any more and a small blade top gap is kept;
(2) when the impeller generates axial movement and radial vibration, the coating can effectively protect the impeller and the current collector from being damaged, and the coating can be sprayed again after being damaged, so that the maintenance and replacement cost is reduced;
(3) the coating is the offset of the blade along the axial position, and can ensure that the blade top clearance is not uniform during assembly, namely the clearance of the air inlet side of the impeller is small, the clearance of the air outlet side is large, the impeller deforms after rotating at high speed, the deformation of the air inlet side is small, the deformation of the initial side is large, and the deformation effectively makes up the assembly clearance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of an impeller according to the present invention;
FIG. 2 is a schematic view of the assembly of the impeller and the collector of the present invention;
FIG. 3 is a schematic view of the assembly of the current collector of the present invention after the current collector has been coated;
FIG. 4 is a partial schematic view of the coating portion of FIG. 3 according to the present invention;
FIG. 5 is a schematic view of the impeller cutting coating of the present invention.
In the figure:
1. current collector 2, impeller 3, coating
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be embodied in other specific forms than described herein, and it will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.
In the following detailed description of the embodiments of the present invention, the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
As shown in fig. 1 and 2, the inner surface of the collector 1 is matched with the cover surface of the impeller 2, the collector 1 is in clearance fit with the impeller 2, and the conventional experience requires that the tip clearance is controlled within five percent of the outlet width B of the impeller 2. The prior method is to form the inner surface of the collector by facing the wheel cover of the impeller outwards at equal intervals. The impeller can deform axially and radially in the high-speed rotation process, and the deformation of the air inlet is smaller than that of the air outlet. When the impeller rotates at a high speed, the air inlet side clearance is increased and the outlet side clearance is reduced due to deformation, and the blade top clearance of the blade is uneven along the axial direction. The equidistant collector ensures that the assembly clearance is larger than the deformation of the impeller, otherwise, the top of the blade rubs against the inner surface of the collector to damage the impeller and the collector, so that a larger clearance exists between the blade and the collector in the prior art.
The invention aims to reduce the blade top clearance, control the blade top clearance within 0.05mm and improve the pressure ratio of an impeller and the efficiency of a fan. Meanwhile, if the impeller accidentally moves when rotating at high speed, when the axial movement is less than 1mm, the impeller and the collector are protected from being damaged due to contact friction. As shown in fig. 3 and 4, the method adopted by the invention comprises the following steps:
(1) designing and determining the shape and size of the impeller;
(2) calculating the axial deformation quantity delta D at the maximum diameter of the impeller;
(3) shifting a wheel cover surface curve S1 of the impeller by a distance delta D along the axial direction to obtain a curve S2;
(4) moving the curve S2 obtained by shifting the curve along the axial direction outwards at equal intervals by 1mm to obtain a curve S3, and processing the curve S3 as the inner surface contour of the current collector substrate;
(5) and spraying a polytetrafluoroethylene coating and other protective coatings on the inner surface of the processed current collector, wherein the thickness of the coating is 1mm, and the coating can resist the temperature of 260 ℃, so that the curve of the inner surface of the current collector finally formed after the coating is sprayed is S2.
And (3) performing simulation calculation on delta D in the step (1) by using ansys finite element software.
The impeller 2 and the current collector 1 are made of metal materials, and if friction occurs when the impeller 2 rotates at a high speed, a large amount of heat generated by the friction damages the impeller 2 and the current collector. The method of adding the coating 3 on the inner surface of the current collector is adopted in the invention, so that the impeller 2 is prevented from directly contacting with the current collector 1. When the fan operates for the first time, the impeller 2 rotates and deforms, the blade and the current collector coating 3 rub, and as the hardness of the coating 3 is far lower than that of the impeller 2, the coating 3 is scraped off by the blade to form chips, and the chips are discharged along with fluid, so that the coating 3 and the impeller 2 are in close fit. After the fan has been operated normally, no further friction occurs between the impeller 2 and the collector coating 3, while the clearance is kept to a minimum.
Other soft metal coatings and the like can be used for the protective coating.
When the impeller rotates at high speed, the impeller deforms axially and radially, the axial deformation quantity delta d and the radial deformation quantity delta r of any point on a blade curve are the total deformation quantity delta L, as shown in figure 5, delta L is larger than delta d, so that the blade generates micro friction with the coating, and the coating generates micro frictionIs cut by an amount ofWherein,since the amount of radial deformation Δ r is small, Δ t is small.
According to the scheme, when the impeller generates axial movement and radial vibration, the coating can effectively protect the impeller and the collector from being damaged, and the coating can be sprayed again after being damaged, so that the maintenance and replacement cost is reduced; the coating is the offset of the blade along the axial position, and can ensure that the blade top clearance is not uniform during assembly, namely the clearance of the air inlet side of the impeller is small, the clearance of the air outlet side is large, the impeller deforms after rotating at high speed, the deformation of the air inlet side is small, the deformation of the initial side is large, and the deformation effectively makes up the assembly clearance.
The above description is for the purpose of describing particular embodiments of the present invention, but the present invention is not limited to the particular embodiments described herein. All equivalent changes and modifications made within the scope of the invention shall fall within the scope of the patent coverage of the invention.
Claims (3)
1. A control method for blade top clearance of a semi-open type impeller is characterized by comprising the following steps: the method comprises the following steps:
(1) designing and determining the shape and size of the impeller;
(2) calculating the axial deformation quantity delta D at the maximum diameter of the impeller;
(3) shifting a wheel cover surface curve S1 of the impeller by a distance delta D along the axial direction to obtain a curve S2;
(4) moving the curve S2 obtained by shifting the curve along the axial direction outwards at equal intervals by 1mm to obtain a curve S3, and processing the curve S3 as the inner surface contour of the current collector substrate;
(5) and spraying a protective coating on the inner surface of the processed current collector, wherein the thickness of the coating is 1mm, so that the curve of the inner surface of the current collector finally formed after the coating is sprayed is S2.
2. The method for controlling the semi-open impeller tip clearance according to claim 1, wherein: and (2) performing simulation calculation on the delta D in the step (1) by using finite element software.
3. The method for controlling the semi-open impeller tip clearance according to claim 1, wherein: and (5) adopting a polytetrafluoroethylene coating as the protective coating and adopting an electrostatic spraying mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510556996.9A CN105201904B (en) | 2015-09-02 | 2015-09-02 | A kind of control method of half-opened impeller blade tip clearance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510556996.9A CN105201904B (en) | 2015-09-02 | 2015-09-02 | A kind of control method of half-opened impeller blade tip clearance |
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| CN105201904A true CN105201904A (en) | 2015-12-30 |
| CN105201904B CN105201904B (en) | 2017-07-28 |
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| CN201510556996.9A Active CN105201904B (en) | 2015-09-02 | 2015-09-02 | A kind of control method of half-opened impeller blade tip clearance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331767A (en) * | 2018-02-06 | 2018-07-27 | 湖北汽车工业学院 | The analogy method and simulator that blade tip clearance influences auto pump pressure fluctuation |
| CN110036208A (en) * | 2017-02-08 | 2019-07-19 | 三菱重工发动机和增压器株式会社 | Compressor and turbocharger |
| CN111365275A (en) * | 2018-12-25 | 2020-07-03 | 珠海格力电器股份有限公司 | Gap Adaptive Centrifugal Compressor |
| CN112824685A (en) * | 2019-11-21 | 2021-05-21 | 泛仕达机电股份有限公司 | Centrifugal impeller with efficiency improving device |
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| US4093401A (en) * | 1976-04-12 | 1978-06-06 | Sundstrand Corporation | Compressor impeller and method of manufacture |
| CN2874088Y (en) * | 2005-12-20 | 2007-02-28 | 上海连成（集团）有限公司 | Open impeller gap regulator |
| WO2009041844A1 (en) * | 2007-09-26 | 2009-04-02 | Balakirev, Evgeny Borisovitch | Fan unit with a free radial fan impeller |
| CN203214437U (en) * | 2013-03-01 | 2013-09-25 | 重庆通用工业(集团)有限责任公司 | Centrifugal blower current collector adjusting device |
| CN203670241U (en) * | 2013-12-23 | 2014-06-25 | 湘潭高新区风动机械有限公司 | Centrifugal ventilator |
| CN204419678U (en) * | 2015-01-22 | 2015-06-24 | 长沙鼓风机厂有限责任公司 | Blower |
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| US4093401A (en) * | 1976-04-12 | 1978-06-06 | Sundstrand Corporation | Compressor impeller and method of manufacture |
| CN2874088Y (en) * | 2005-12-20 | 2007-02-28 | 上海连成（集团）有限公司 | Open impeller gap regulator |
| WO2009041844A1 (en) * | 2007-09-26 | 2009-04-02 | Balakirev, Evgeny Borisovitch | Fan unit with a free radial fan impeller |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110036208A (en) * | 2017-02-08 | 2019-07-19 | 三菱重工发动机和增压器株式会社 | Compressor and turbocharger |
| CN110036208B (en) * | 2017-02-08 | 2021-05-28 | 三菱重工发动机和增压器株式会社 | Centrifugal compressors and turbochargers |
| CN108331767A (en) * | 2018-02-06 | 2018-07-27 | 湖北汽车工业学院 | The analogy method and simulator that blade tip clearance influences auto pump pressure fluctuation |
| CN108331767B (en) * | 2018-02-06 | 2020-06-05 | 湖北汽车工业学院 | Simulation method and simulation device for influence of blade tip clearance on pressure pulsation of automobile water pump |
| CN111365275A (en) * | 2018-12-25 | 2020-07-03 | 珠海格力电器股份有限公司 | Gap Adaptive Centrifugal Compressor |
| CN112824685A (en) * | 2019-11-21 | 2021-05-21 | 泛仕达机电股份有限公司 | Centrifugal impeller with efficiency improving device |
| CN112824685B (en) * | 2019-11-21 | 2022-08-09 | 泛仕达机电股份有限公司 | Centrifugal impeller with efficiency improving device |
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| Publication number | Publication date |
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| CN105201904B (en) | 2017-07-28 |
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