KR101612854B1 - Impeller assembly of fluid rotary machine - Google Patents

Impeller assembly of fluid rotary machine Download PDF

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Publication number
KR101612854B1
KR101612854B1 KR1020120148872A KR20120148872A KR101612854B1 KR 101612854 B1 KR101612854 B1 KR 101612854B1 KR 1020120148872 A KR1020120148872 A KR 1020120148872A KR 20120148872 A KR20120148872 A KR 20120148872A KR 101612854 B1 KR101612854 B1 KR 101612854B1
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KR
South Korea
Prior art keywords
blade
shroud
shroud plate
base portion
impeller
Prior art date
Application number
KR1020120148872A
Other languages
Korean (ko)
Other versions
KR20140079194A (en
Inventor
안종기
Original Assignee
한화테크윈 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한화테크윈 주식회사 filed Critical 한화테크윈 주식회사
Priority to KR1020120148872A priority Critical patent/KR101612854B1/en
Priority to PCT/KR2013/011579 priority patent/WO2014098417A1/en
Publication of KR20140079194A publication Critical patent/KR20140079194A/en
Application granted granted Critical
Publication of KR101612854B1 publication Critical patent/KR101612854B1/en

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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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F05D2230/237—Brazing

Abstract

The impeller assembly of the fluid rotary machine includes a rotary shaft, a base portion coupled to the outer side of the rotary shaft, a radially extending portion extending radially outward from the rotary shaft, spaced apart in the circumferential direction about the rotary shaft, And a plurality of shroud plates disposed between the adjoining blades, wherein the edges are seated on the stepped portions of adjacent blades, and the stepped portions and the edges are welded to each other.

Description

Technical Field [0001] The present invention relates to an impeller assembly of a fluid rotary machine,

Embodiments relate to an impeller assembly of a fluid rotary machine, and more particularly to an impeller assembly having an improved efficiency by integrally forming an impeller and a shroud.

A compressor or a pump for compressing a fluid has a structure of a rotating machine having a rotating part.

Generally, such a rotating machine has an impeller as a rotating part, and the impeller functions to increase the pressure of the fluid by transmitting rotational kinetic energy to the fluid. The impeller includes a plurality of blades that assist in fluid movement and transfer energy to the fluid.

On the other hand, a shroud is disposed outside the impeller, and the shroud functions as a fluid passage along with the blade.

Generally, as the interval between the blades and the shroud becomes narrower, the efficiency of the compressor increases. Therefore, a technique of maximizing the efficiency of the compressor by manufacturing a shroud in combination with the impeller has recently been proposed.

In the case of a technique in which the impeller is combined with the shroud, a process of fixing the impeller blades and the shroud to each other is required. For this purpose, processes such as a casting process, a brazing process, and an electron beam welding process are used.

Japanese Unexamined Patent Application Publication No. 2004-353608 discloses a technique for welding and reinforcing a shroud to an impeller. The impeller and the shroud are fixed to each other by simply welding the impeller and the shroud in contact with each other. However, according to this method, during the process of welding the impeller and the shroud, the shape of the impeller and the shroud can be severely deformed due to excessive heat input.

Japanese Laid-Open Patent Publication No. 2004-353608 (December 16, 2004)

An object of embodiments is to provide an impeller assembly of a fluid rotary machine in which efficiency is improved by integrally forming an impeller and a shroud.

Another object of the embodiments is to provide an impeller assembly of a fluid rotary machine having a stable structure by improving the welding strength of the blades of the shroud and the impeller.

The impeller assembly of the fluid rotating machine according to one embodiment includes a rotating shaft, a base portion coupled to the outside of the rotating shaft and extending in the circumferential direction, and a plurality of radially extending portions extending radially outward from the rotating shaft, A plurality of blades disposed in the base portion and having a step portion whose width is narrowed at an end portion facing the opposite side of the base portion; and a plurality of blades disposed between the adjacent blades and having the edges seated in the stepped portions of the adjacent blades, And a plurality of shroud plates coupled by welding.

A brazing filler is applied to a portion of the shroud plate facing the shroud plate at a portion facing the shroud plate so that the portion where the blade and the shroud plate contact each other can be connected by a brazing process.

The stepped portion of the blade may be formed extending at least in a section along the blade in a radial direction toward the outside from the rotation axis.

Since the impeller assembly of the fluid rotary machine according to the embodiments as described above is fixed to each other by welding so that the blades and the shroud plates satisfy a precise tolerance level, the gap between the blades and the shroud plate is set to a design level So that the efficiency of the fluid rotary machine is improved.

Further, since the welding process is applied in a state where the stepped portion of the blade and the edge of the shroud plate are stably installed, it is possible to secure a large welding area area. Therefore, it is possible to minimize the occurrence of phenomena such as cracks at the joint surface between the shroud plate and the blade during the welding process.

In addition, by applying a brazing process to the contact surfaces of the shroud plate and the blade facing the base while the shroud plate and the blade are fixed to each other by the welding process, the inner side of the shroud plate and the blade can be more stably bonded to each other.

1 is a perspective view schematically showing an assembly process of an impeller assembly of a fluid rotary machine according to an embodiment.
Figure 2 is a schematic cross-sectional view of the impeller assembly of Figure 1;
3 is a cross-sectional view taken along line III-III of the impeller assembly of FIG.
4 is a cross-sectional view showing a state in which a welding process is applied to the impeller assembly of FIG. 1;

Hereinafter, the structure and operation of the impeller assembly of the fluid rotary machine relating to the embodiments will be described in detail through the embodiments of the accompanying drawings. The expression " and / or " used in the description refers to one of the elements or a combination of elements.

FIG. 1 is a perspective view schematically showing an assembly process of an impeller assembly of a fluid rotary machine according to one embodiment, and FIG. 2 is a schematic cross-sectional view of the impeller assembly of FIG.

The impeller assembly 100 of the fluid rotary machine according to the embodiment shown in Figs. 1 and 2 includes an impeller 110 and a shroud 120.

In the illustrated embodiment, the rotary machine is implemented as a compressor, but the embodiment is not limited thereto. That is, it is sufficient that the rotating machine according to the embodiment can change the pressure and the velocity of the fluid by the rotational motion of the impeller assembly. For example, the rotary machine according to the embodiment is a comprehensive concept including a pump, a blower, and the like.

The impeller 110 includes a rotating shaft 111, a base portion 112 formed on the outer side of the rotating shaft 111 and radially increasing in outer diameter along the up and down direction, And the plurality of blades 113 are disposed at intervals of a predetermined distance.

The base portion 112 is coupled to the outer side of the rotating shaft 111 and may be formed so as to radially increase the outer diameter along the vertical direction. The surface of the base portion 112 is formed so as to form an inclined curved surface, and is designed to smooth the fluid flow by forming the bottom surface of the fluid passage, and to maximize the energy transfer to the fluid.

The blade 113 is disposed on the base portion 112 and performs the function of guiding the movement of the fluid while transmitting the kinetic energy of the impeller 110 to the fluid. The blades 113 may be spaced apart from each other at a predetermined interval around the rotation axis 111 and may be disposed in a plurality of positions and may be arranged in a substantially radial pattern on the base portion 112. The fluid introduced from the inlet port 100a by the rotation of the blade 113 is compressed according to the centrifugal force and is discharged to the outside through the outlet port 100b.

The shroud 120 is formed in a substantially hollow cylinder shape having an upper end opened to form an inlet port 100a of the fluid and extending radially along the outer periphery of the plurality of blades 113 from the opened upper end downward . The shroud 120 forms a ceiling surface of the fluid passage and forms a fluid passage with the base portion 112 and the blade 113.

The shroud 120 has a plurality of shroud plates 120a. The shroud plate 120a is disposed between adjacent blades 113. [ The shroud plate 120a and the blade 113 can be joined to each other by welding after the shroud plate 120a is disposed on the blade 113 as shown in Fig.

Referring to FIG. 2, the process of compressing the fluid by the rotational motion of the impeller assembly will be described below. When the rotary shaft 111a rotates, for example, the impeller 110 and the shroud 120 rotate together with the rotary shaft 111a.

The fluid introduced through the inlet port 100a of the impeller assembly 100 is compressed to a high pressure state by the centrifugal force according to the rotational kinetic energy of the impeller assembly 100 and exits through the outlet port 100b. The fluid exiting the impeller assembly 100 through the outlet 100b is reduced in speed as it passes through, for example, a diffuser (not shown), and at the same time the pressure rises to the required level.

FIG. 3 is a cross-sectional view taken along line III-III of the impeller assembly of FIG. 1, and FIG. 4 is a cross-sectional view illustrating a state where a welding process is applied to the impeller assembly of FIG.

Hereinafter, a method of manufacturing an impeller assembly according to an embodiment will be described with reference to FIGS. 3 and 4. FIG.

As a component for constituting the rotating machine, a plurality of blades 113 and a plurality of shroud plates 120a are prepared. 1, the blades 113 constitute the impeller 110 together with the rotating shaft 111 and the base portion 112, and the shroud plates 120a and 120b are mounted on the surface of the base portion 112, But the embodiment is not limited thereto. That is, as another embodiment, the blade 113 may be mounted on the base portion 112 only after it first engages with the shroud plate 120a.

Lightweight carbon steel may be used for the blade 113 and the shroud plate 120a, or a non-ferrous metal such as aluminum may be used. The material of the blade 113 and the shroud plate 120a according to the embodiment is a metal, and there is no particular limitation.

The blade 113 has a step portion 113a whose width is narrowed at the end facing the base portion 112 toward the opposite side. The stepped portion 113a is formed to extend along the blade 113 in the radial direction facing outward from the rotating shaft 111a (see Fig. 1).

The edge 120b of the shroud plate 120a is seated on the stepped portion 113a of the blade 113. [ The surface 113f of the end portion of the blade 113 facing the base portion 112 and the surface 120f of the shroud plate 120a facing away from the base portion 112 coincide with each other. That is, the depth of the step portion 113a is formed to correspond to the thickness of the shroud plate 120a. Therefore, the shroud plate 120a can be stably disposed between the adjacent blades 113. [

1, the thickness of the shroud plates 120a and the height of the stepped portion 113a of the blade 113 are adjusted so that the shape of the entire shroud 120 can be assembled from the plurality of shroud plates 120a. They can have complementary shapes that mesh with each other. With respect to the number of the shroud plates 120a, for example, when the shroud plates 120a are welded with each blade 113 as a boundary, as many shroud plates 120a as the total number of blades 113 are prepared .

After the shroud plate 120a is disposed between the blades 113, the surface 113f of the end portion of the blade 113 facing away from the base portion 112 and the surface 113f of the blade 113 facing the opposite side to the base portion 112 The stepped portion 113a and the edge 120b are welded from the surface 120f of the shroud plate 120a. The edge 120b of the shroud plate 120a and the stepped portion 113a of the blade 113 are welded to form the welded portion 130 so that the shroud plate 120a and the blade 113 can be firmly fixed to each other.

The welding strength when the shroud plate 120a and the blade 113 are fixed by welding is proportional to the strength of the base material and the area of the portion to be welded. The welding process is applied in a state where the stepped portion 113a of the blade 113 and the edge 120b of the shroud plate 120a are seated in the impeller assembly 100 having the above- Thereby improving the welding strength.

For the welding process, welding using high-density energy can be applied. For example, welding using a laser or an electron beam can be used. When using a metal material such as aluminum to weld the shroud plate to the blade, the shroud plate and blades melt due to the high energy applied to form the fillet, if the laser or electron beam is used, to deviate from the required tolerance It is impossible to obtain an outer shape of the impeller assembly designed originally. On the other hand, when welding is performed using low energy, incomplete melting defects occur due to insufficient melting.

Since the welding process is applied in a state where the stepped portion 113a of the blade 113 and the edge 120b of the shroud plate 120a are stably installed in the impeller assembly 100 having the above- . Therefore, a crack can be minimized in the joint surface between the shroud plate 120a and the blade 113 during the welding process.

4, a brazing filler 141 is applied to a portion of the shroud plate 120a facing the base portion 112 to contact the blade 113 and the shroud plate 120a, and the blade 113 and the shroud The contacting portion of the plate 120a can be connected by a brazing process.

The brazing process may be applied after the welding process of the shroud plate 120a and the blade 113 is finished and the shroud plate 120a and the blade 113 are fixed to each other. The brazing process is a method of melting a low melting point filler so as not to damage the base material and bonding the base material.

Since the shroud plate 120a and the blade 113 are welded to each other by the welding process as described above, the brazing filler 120a and the blade 113 are formed on the contact surface between the shroud plate 120a and the blade 113, The brazing filler 141 melts so that the inner side of the shroud plate 120a and the blade 113 can be more stably bonded to each other when the brazing filler 141 is applied after the brazing filler 141 is melted. .

The blade 113 and the shroud plate 120a are fixed to each other by welding so as to satisfy a precise tolerance level so that the gap between the blade 113 and the shroud plate 120a is rotated The efficiency of the fluid rotary machine can be improved by precisely securing it to the design level required by the machine.

The construction and effect of the above-described embodiments are merely illustrative, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Accordingly, the true scope of protection of the invention should be determined by the appended claims.

100a: inlet 113a: stepped portion
100b: outlet 113: blade
100: impeller assembly 120b: edge
110: Impeller 120a: Shroud plate
111: rotating shaft 120: shroud
111a: rotating shaft 141: brazing filler
112: Base portion

Claims (3)

A rotating shaft;
A base portion coupled to the outside of the rotation shaft and extending in the circumferential direction;
A plurality of blades extending in a radial direction from the rotating shaft toward the outside and spaced apart from each other in the circumferential direction about the rotating shaft and disposed at the base portion and having a stepped portion at an end portion facing the opposite side of the base portion; And
And a plurality of shroud plates disposed between the adjacent blades and having an edge mounted on the stepped portion of the adjacent blade and the edge contacting the stepped portion and being joined to the stepped portion by welding,
The surface of the end portion of the blade facing the opposite side of the base portion and the surface of the shroud plate facing the opposite side of the base portion coincide with each other,
The step and the edge are welded from the surface of the end of the blade toward the opposite side of the base portion and from the surface of the shroud plate. The method according to claim 1,
Wherein a brazing filler is applied to a portion of the shroud plate facing the shroud plate so that the blade and the shroud plate contact each other at a portion facing the shroud plate by a brazing process. The method according to claim 1,
Wherein the step of the blade is formed extending at least in part along the blade in a radial direction outwardly from the rotational axis.
KR1020120148872A 2012-12-18 2012-12-18 Impeller assembly of fluid rotary machine KR101612854B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020120148872A KR101612854B1 (en) 2012-12-18 2012-12-18 Impeller assembly of fluid rotary machine
PCT/KR2013/011579 WO2014098417A1 (en) 2012-12-18 2013-12-13 Impeller assembly of fluid rotary machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120148872A KR101612854B1 (en) 2012-12-18 2012-12-18 Impeller assembly of fluid rotary machine

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KR20140079194A KR20140079194A (en) 2014-06-26
KR101612854B1 true KR101612854B1 (en) 2016-04-26

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WO (1) WO2014098417A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102208490B1 (en) * 2014-07-07 2021-01-27 한화에어로스페이스 주식회사 Method for manufacturing rotation part of rotary machine
KR102347638B1 (en) * 2017-08-08 2022-01-05 한화파워시스템 주식회사 Semi-shrouded impeller
CN114901920A (en) * 2019-12-09 2022-08-12 丹佛斯公司 Shrouded impeller assembly for a compressor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009105208A2 (en) * 2008-02-22 2009-08-27 Horton, Inc. Fan manufacturing and assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005146962A (en) * 2003-11-14 2005-06-09 Hitachi Industries Co Ltd Centrifugal impeller and its manufacturing method
JP4458109B2 (en) * 2007-03-27 2010-04-28 株式会社日立プラントテクノロジー Weld groove sealing structure
US8727729B2 (en) * 2010-06-29 2014-05-20 Turbocam, Inc. Method for producing a shrouded impeller from two or more components
KR101247315B1 (en) * 2010-12-28 2013-03-25 삼성테크윈 주식회사 Method of manufacturing rotation part of rotary machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009105208A2 (en) * 2008-02-22 2009-08-27 Horton, Inc. Fan manufacturing and assembly

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KR20140079194A (en) 2014-06-26

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