KR20150107471A - Method for joining rotation part of rotary machine - Google Patents

Method for joining rotation part of rotary machine Download PDF

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Publication number
KR20150107471A
KR20150107471A KR1020140030464A KR20140030464A KR20150107471A KR 20150107471 A KR20150107471 A KR 20150107471A KR 1020140030464 A KR1020140030464 A KR 1020140030464A KR 20140030464 A KR20140030464 A KR 20140030464A KR 20150107471 A KR20150107471 A KR 20150107471A
Authority
KR
South Korea
Prior art keywords
shroud
blade
brazing
present
rotating
Prior art date
Application number
KR1020140030464A
Other languages
Korean (ko)
Inventor
김태형
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 KR1020140030464A priority Critical patent/KR20150107471A/en
Priority to PCT/KR2014/012630 priority patent/WO2015137613A1/en
Publication of KR20150107471A publication Critical patent/KR20150107471A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/002—Soldering by means of induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0018—Brazing of turbine parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/001—Turbines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

According to an aspect of the present invention, there is provided a method of joining a rotating part of a rotating machine having a blade and a shroud, comprising the steps of: preparing the blade and the shroud; placing the blade on one surface of the shroud; Disposing a brazing filler between the shrouds; placing a coil so as to adjoin a portion of the other surface of the shroud that corresponds to a position where the blade is disposed on one surface of the shroud; Heating the shroud by an induction heating method to melt the disposed brazing filler to form a brazing part, and cooling the brazing part.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of joining rotating parts of a rotating machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating member joining method of a rotating machine, and more particularly, to a joining method of a compressor and a pump having a rotating member.

BACKGROUND ART [0002] A compressor or a pump for compressing a fluid or the like generally has a structure of a rotating machine having a rotating part therein.

Generally, such a rotating machine has an impeller as a rotating part, which is configured to transfer rotational kinetic energy to the fluid to raise the pressure of the fluid. To this end, the impeller is provided with 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 gap between the blade and the shroud becomes narrower, the efficiency of the compressor increases. Recently, a technique for maximizing the efficiency of the compressor by manufacturing the shroud to the impeller has been proposed.

However, in the case of a technique in which a shroud is combined with an impeller, a process of fixing the impeller blades and the shroud to each other is required, and various processes are used for this purpose. For example, U.S. Patent Application Publication No. 2006-0080889 discloses a method of mutually fixing a blade and a shroud using a welding method.

According to an aspect of the present invention, there is provided a method of joining a rotating portion of a rotating machine having a bonding structure having sufficient strength and reliability.

According to an aspect of the present invention, there is provided a method of joining a rotating portion of a rotating machine having a blade and a shroud, the method comprising: preparing the blade and the shroud; placing the blade on one surface of the shroud; Disposing a brazing filler between the blade and the shroud; placing a coil adjacent to a portion of the other surface of the shroud where the blade is disposed on one side of the shroud; A method of joining a rotary part of a rotating machine, comprising: heating a shroud by applying an electric current to a coil to heat the shroud to form a brazing part by melting the disposed brazing filler; and cooling the brazing part to provide.

The brazing part may include a fillet part and a gap joint part connected to the fillet part and formed between the blade and the shroud.

Here, the size of the curvature radius of the formed fillet portion may be adjusted according to the temperature gradient of the heated shroud.

According to one aspect of the present invention, there is an effect that the strength and reliability of the joining structure of the blade and the shroud can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a rotary part of a rotating machine according to an embodiment of the present invention. FIG.
2 is a cross-sectional view of Fig.
FIG. 3 is a cross-sectional view illustrating a rotating portion bonding structure of a rotating machine according to an embodiment of the present invention.
FIGS. 4 to 6 are cross-sectional views illustrating steps of the rotating unit joining process of the rotating machine according to the embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, the same reference numerals are used for constituent elements having substantially the same configuration, and redundant description is omitted.

FIG. 1 is a perspective view showing a schematic view of a rotating part of a rotating machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of FIG. 1. FIG. 3 is a cross-sectional view illustrating a rotating portion bonding structure of a rotating machine according to an embodiment of the present invention.

The rotating machine according to the present embodiment is a compressor, and the rotating part 100 therein is configured to include an impeller 110 and a shroud 120, as shown in FIGS.

The rotating machine according to the present embodiment is a compressor, but the present invention is not limited thereto. That is, the rotating machine according to the present invention is applicable to a device capable of changing the pressure and speed of the fluid by the rotation of the rotating part. For example, the rotating machine according to the present invention may be a pump, a blower, or the like.

The impeller 110 includes an inner core 111, a base portion 112, and a plurality of blades 113.

The inner core 111 is formed to have a cylindrical shape.

The inner core 111 has a mounting hole 111a formed in the mounting hole 111a so that the inner core 111 can receive the power of the rotating shaft from the impeller 110, As shown in FIG.

The base portion 112 is located at the outer periphery of the inner core 111. The surface 112a of the base portion 112 is formed to be a sloped curved surface to form a bottom surface of the fluid passage to smooth the fluid flow. In addition, it is designed to maximize energy transfer to the fluid.

In the present embodiment, the inner core 111 and the base portion 112 are separately formed and then assembled, but the present invention is not limited thereto. In other words, the internal core 111 and the base 112 according to the present invention can be integrally formed from the beginning to form a single structure.

The blades 113 are formed on the surface 112a of the base portion 112 and perform the function of guiding the movement of the fluid while transmitting the kinetic energy of the impeller 110 to the fluid.

On the other hand, the shroud 120 has an umbrella shape that is joined to the upper portion of the blade 113 and has a central portion opened to cover the upper portion of the blade 113.

The shroud 120 forms the top surface of the fluid passage and forms a fluid passage along with the base portion 112 and the blade 113.

The process of transferring energy to the fluid by the rotation of the rotation unit 100 will be described.

When the rotary shaft (not shown) installed in the mounting hole 111a rotates, the impeller 110 and the shroud 120 also rotate.

The fluid flows into the inlet port 100a of the rotary part 100 in the direction of the arrow shown in FIG. 2 and then receives the rotational kinetic energy of the rotary part 100 and is discharged to the discharge port 100b under a high pressure. Subsequently, the fluid passes through a diffuser (not shown) to reduce the velocity and increase the pressure to a desired level, and a detailed description thereof will be omitted.

Hereinafter, with reference to FIG. 3, a joining structure of the rotation part 100 according to an embodiment of the present invention will be described.

The joining structure of the rotary part 100 includes a brazing part 130.

The brazing portion 130 is formed at the joint portion J of the blade 113 and the shroud 120 and includes a fillet portion 131 and a gap joint portion 132.

The fillet portion 131 is formed at both edges of the joint J, and has a curvature radius R1 (R2). Since the shape of the fillet portion 131 including the radius of curvature is related to the bonding strength and the stress concentration, the designer and the operator reflect the fact and appropriately design and manufacture the shape of the fillet portion 131.

The gap contact portion 132 is connected to the fillet portion 131 and is formed between the blade 113 and the shroud 120 in the portion of the joint J.

The brazing part 130 is formed by placing a brazing filler F as a brazing filler material in the joint part J of the blade 113 and the shroud 120 and then performing brazing in an induction heating method. The process will be described later.

Hereinafter, with reference to Figs. 4 to 6, a method of joining the rotation part 100 according to an embodiment of the present invention will be described.

FIGS. 4 to 6 are cross-sectional views illustrating steps of the rotating unit joining process of the rotating machine according to the embodiment of the present invention.

First, the operator prepares a blade 113 and a shroud 120 of a metal material (step S101).

The blade 113 in the step S101 is already mounted on the surface 112a of the base 112 and awaits the process of joining the blade 113 and the shroud 120. However, Not limited. That is, the blade 113 according to the present invention may be first attached to the shroud 120, and then mounted to the base portion 122.

Lightweight carbon steel may be used for the blade 113 and the shroud 120, and a non-ferrous metal such as aluminum may be used. That is, the blade 113 and the shroud 120 according to the present invention are not particularly limited.

4, a part of the blade 113 is disposed on one surface 120a of the shroud 120, and a brazing filler (not shown) is interposed between the blade 113 and the shroud 120, (Step S102).

Here, the brazing filler (F) may be used as a brazing filler in various kinds and forms depending on the material of the base material, that is, the material of the blade (113) and the shroud (120). Generally, tin shoulder, silver shoulder, brass shoulder, nickel-silver, copper, silymine, and other well-known fillers may be used as the type of the brazing filler metal. Examples of the filler include powder, paste, And the like.

The brazing filler F according to this embodiment is suitably used in accordance with the material of the blades 113 and the shroud 120. In this case, a paste form including a filler is preferably used , The type and form of the brazing filler metal applicable to the present invention are not particularly limited as described above.

5, the operator places the blade 113 on the opposite side of the portion of the other surface 120b of the shroud 120 where the blade 113 is disposed on one surface 120a of the shroud 120 And the shroud 120 is heated by an induction heating method by applying an alternating current to the coil C. As a result, In such an induction heating method, since the current induced by the portion closer to the coil C is large and the heating degree becomes high, the heated region H starts to exist from the portion near the coil C (the other surface 120b) , And gradually expanded toward the brazing filler (F). When the area H to be heated is sufficiently enlarged and heat is sufficiently transferred to the brazing filler F, the brazing filler F is melted and spreads evenly into the space between the blade 113 and the shroud 120, , A brazing part 130 including a fillet part 131 and a clearance bonding part 132 is formed as shown in FIG. 6 (step S103).

The operator then gradually reduces the current applied to the coil C to gradually cool the shroud 120 and the brazing part 130 by stopping induction heating (step S104).

According to the present embodiment, since the shroud 120 is heated by the induction heating method, the worker (or the work computer program) adjusts the heating level of the shroud 120 by adjusting the amount of current applied to the coil C. The cooling level can be easily adjusted.

That is, the worker (or the work computer program) adjusts the amount of current applied to the coil C to adjust the heating level of the shroud 120 so that the temperature gradient according to the thickness of the shroud 120 can be adjusted . The flow of the melt of the brazing filler F and the size of the radius of curvature R1 (R2) of the fillet portion 131 can be easily controlled . In this case, the shape of the brazing part 130 is easily realized as designed, so that the strength of the joint structure of the rotary part 100, the degree of stress concentration, and the durability can be realized at a level designed by the designer.

In addition, the operator can easily adjust the cooling level of the shroud 120 and the brazing part 130 as well. That is, the operator can prevent the abrupt cooling action by gradually reducing the current applied to the coil C in the process of cooling the shroud 120 and the brazing part 130 in step S104. This can reduce the occurrence of the residual stress caused by the difference in cooling rate between the surface and the inside of the shroud 120 and the brazing part 130, so that the durability of the joint structure of the rotary part 100 can be increased.

As described above, according to the joining structure of the rotary part 100 of the rotating machine and the joining method of the rotary machine according to the present embodiment, the brazing filler F is attached to the joint part J of the blade 113 and the shroud 120 And the coil C is disposed so as to be adjacent to a portion of the other surface 120b of the shroud 120 corresponding to a position where the blade 113 is disposed on one surface 120a of the shroud 120, A current is applied to the coil C, and the shroud 120 is heated by an induction heating method to form the brazing part 130. Since the heating action can be relatively concentrated on the portion of the shroud 120 disposed near the coil C due to the characteristic of the induction heating, the dimensional change due to the thermal expansion can be minimized in other portions, Accuracy can be increased. Since the brazing part 130 is disposed at the joint part J of the shroud 120 and the blade 113, the brazing part 130 is not exposed to the outside of the rotating part 100, .

In addition, due to the characteristics of the brazing process applied to the bonding method of this embodiment, the molten brazing filler F spreads evenly through the narrow gap between the blade 113 and the shroud 120 by the capillary phenomenon, 131 and the clearance joint 132, it is possible to prevent the cracks of the joint J and to improve the reliability of the joint.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand the point. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

The present invention can be used for manufacturing a rotating machine having a rotating part such as a compressor, a pump, and the like.

100: rotating part 110: impeller
111: inner core 112: base portion
113: Blade 120: Shuraud
130: Brazing part

Claims (3)

A method of joining a rotating portion of a rotating machine having a blade and a shroud,
Preparing the blade and the shroud;
Disposing a brazing filler between the blade and the shroud while disposing the blade on one side of the shroud;
Arranging a coil so that the blade is adjacent to a portion of the other surface of the shroud that corresponds to a position where the blade is disposed on one surface of the shroud and heating the shroud by applying an electric current to the coil, Melting the disposed brazing filler to form a brazing part; And
And cooling the brazing part. The method according to claim 1,
The brazing part includes:
Fillet portion; And
And a gap connection portion connected to the fillet portion and formed between the blade and the shroud. 3. The method of claim 2,
Wherein the size of the radius of curvature of the formed fillet portion is adjusted according to a temperature gradient of the heated shroud.
KR1020140030464A 2014-03-14 2014-03-14 Method for joining rotation part of rotary machine KR20150107471A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020140030464A KR20150107471A (en) 2014-03-14 2014-03-14 Method for joining rotation part of rotary machine
PCT/KR2014/012630 WO2015137613A1 (en) 2014-03-14 2014-12-22 Method for welding rotary part of rotary machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140030464A KR20150107471A (en) 2014-03-14 2014-03-14 Method for joining rotation part of rotary machine

Publications (1)

Publication Number Publication Date
KR20150107471A true KR20150107471A (en) 2015-09-23

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Application Number Title Priority Date Filing Date
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WO (1) WO2015137613A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1061746A (en) * 1996-08-21 1998-03-06 Denki Kogyo Co Ltd Brazing method
KR20050112002A (en) * 2004-05-24 2005-11-29 한국생산기술연구원 Apparatus and method for brazing a diamond tool
KR20090024512A (en) * 2007-09-04 2009-03-09 삼성전기주식회사 Method for bonding
KR20130033718A (en) * 2011-09-27 2013-04-04 삼성테크윈 주식회사 Joining structure of rotation part of rotary machine and method for joining rotation part of rotary machine
KR101954955B1 (en) * 2012-05-24 2019-03-08 현대자동차주식회사 The Process for Repairing Ex-Mani by Brazing

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