WO2015111855A1

WO2015111855A1 - Impeller assembly and impeller assembly manufacturing method

Info

Publication number: WO2015111855A1
Application number: PCT/KR2015/000087
Authority: WO
Inventors: 김종국
Original assignee: 삼성테크윈 주식회사
Priority date: 2014-01-24
Filing date: 2015-01-06
Publication date: 2015-07-30
Also published as: KR20150088641A

Abstract

The present invention provides an impeller assembly and an impeller assembly manufacturing method. The present invention comprises: a base portion; a blade installed on the base portion; and a shroud arranged to be spaced from the base portion, a part of the blade being inserted into and coupled to the shroud, wherein the blade has a protrusion formed to be inserted into the shroud, and the shroud has a groove into which the protrusion is inserted and bonded thereto through friction stir welding.

Description

Impeller Assembly and Impeller Assembly Method

The present invention relates to an assembly and a manufacturing method, and more particularly to an impeller assembly and an impeller assembly manufacturing method.

The impeller delivers rotational kinetic energy to the fluid to increase the pressure of the fluid. To this end, a plurality of blades are provided on one surface of the base part to assist the movement of the fluid and to transfer the rotational kinetic energy to the fluid. In addition, a shroud is disposed outside the impeller. The shroud together with the blade forms a moving passage of the fluid.

In general, the narrower the gap between the blade and the shroud has the characteristic of increasing the efficiency of the compressor, and recently, by combining the shroud with the impeller to manufacture integrally, a technique for maximizing the efficiency of the compressor has been proposed.

In the case of manufacturing a shroud by coupling the impeller, a process of joining the blade and the shroud of the impeller is required. For this purpose, a riveting process or a welding process is used.

Japanese Patent Laid-Open Publication No. 2004-353608 or US Patent Publication No. 2010-0037458 discloses a technique for reinforcing by welding a shroud to an impeller. And shroud are fixed to each other. When the impeller and the shroud are joined by such a welding process, an excessive amount of heat input of the welding may occur, and thus the shape of the impeller and the shroud may be severely deformed.

In addition, the joining using the rivet may be complicated in the shape of the blade, it is difficult to transfer the rotational kinetic energy due to the impeller rotation to the fluid.

Therefore, there is a need for a new method of manufacturing an impeller assembly that can overcome these disadvantages.

Embodiments of the present invention are to provide an impeller assembly manufactured using friction stir welding (FSW) and an impeller assembly manufacturing method using friction stir welding.

An aspect of the present invention includes a base portion, a blade installed on the base portion, and a shroud disposed to be spaced apart from the base portion to insert and couple a portion of the blade, wherein the blade is the shira And a protrusion formed to be inserted into the wood, wherein the shroud has a groove into which the protrusion is inserted and joined by friction stir welding.

Embodiments of the present invention can produce an impeller assembly by minimizing thermal deformation that may occur when using friction stir welding. In addition, embodiments of the present invention can increase the bonding strength by widening the bonding area of the shroud and the blade. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view showing an impeller assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1.

3 is a cross-sectional view showing a method of manufacturing an impeller assembly according to an embodiment of the present invention.

In addition, the protrusion may be formed in a polygonal shape at the end of the blade, the groove may be formed in a shape corresponding to the protrusion.

Another aspect of the invention, the impeller assembly manufacturing method having a blade having a protrusion formed in a polygonal shape at the end and a shroud having a groove corresponding to the shape of the protrusion, inserting the protrusion into the groove and the blade Coupling the shroud, joining the protrusion and the groove by friction stir welding, and cutting the outer circumferential surface of the shroud to correspond to the outer circumferential surface of the base to remove the holes generated during the friction stir welding. It provides a method for producing an impeller assembly comprising.

The invention will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Meanwhile, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are only used to distinguish one component from another.

1 is a perspective view showing an impeller assembly 100 according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view showing a method of manufacturing an impeller assembly according to an embodiment of the present invention.

1 to 3, the impeller assembly 100 may include a rotating shaft 110, a base 120, a blade 130, and a shroud 140.

The base portion 120 is formed outside the rotation shaft 110. In detail, the outer diameter increases radially along the vertical direction about the rotation shaft 110 and extends in the circumferential direction. The surface of the base portion 120 is formed to form an inclined curved surface to smooth the fluid flow and minimize the energy loss due to the flow of the fluid.

The blade 130 is formed on the surface of the base 120 to perform the function of guiding the movement of the fluid and to transmit the rotational kinetic energy of the impeller assembly 100 to the fluid.

The blade 130 and the base 120 may be manufactured, respectively, so that the blade 130 may be coupled to the base 120. In addition, the blade 130 may be manufactured integrally with the base portion 120. For example, the blade 130 may be integrally formed with the base part 120 by various methods such as casting, injection, and cutting through a mold. In addition, in order to strengthen the coupling strength of the blade 130 and the base portion 120 may be formed to round the coupling portion of the blade 130 and the base portion 120. However, hereinafter, the blade 130 and the base unit 120 will be described in detail with reference to a case where the blade unit 130 and the base unit 120 are integrally formed.

Blades 130 may be spaced apart from each other at a predetermined interval around the rotation axis may be arranged in plurality. In addition, the blades 130 may be arranged in a substantially radial shape on the base portion 120. The shape of the blade 130 may be formed in a curved shape along the direction of rotation to transfer the maximum rotational kinetic energy generated by the impeller assembly 100 to the fluid.

The shroud 140 extends circumferentially about the rotation shaft 110 and is disposed to cover the upper side of the blade 130. Therefore, the shroud 140 may form a fluid passage together with the base 120 and the blade 130.

Fluid introduced in the axial direction of the rotation shaft 110 through the inlet of the fluid passage flows along the fluid passage. In this case, the fluid is discharged in the radial direction of the rotating shaft through the outlet of the fluid passage after receiving the rotational kinetic energy of the impeller assembly 100.

The blade 130 and the shroud 140 may be bonded by friction stir welding (FSW). The blade 130 has a protrusion 131 formed to be inserted into the shroud 140, and the shroud 140 has a groove 141 into which the protrusion 131 is inserted and joined by friction stir welding. The groove 141 is formed along the blade 130 with a groove smaller than the thickness of the shroud 140 on the surface of the shroud 140, and the height of the protrusion 130 is inserted into the groove 141. It can be formed smaller than the thickness.

The protrusion 131 may be formed in a polygonal shape at the end of the shroud 140, and the groove 141 may be formed in a polygonal shape corresponding to the protrusion 131. The shape of the protrusion 131 is not limited to a specific polygon, but for convenience of description, the protrusion 131 will be described based on the triangular protrusion 131.

The protrusion 131 may form two slopes to widen the contact area between the protrusion 131 and the groove 141. When the contact area between the protrusion 131 and the groove 141 is wide, the material of the protrusion 131 and the material of the groove 141 are agitated and welded in a large area, thereby joining the blade 130 and the shroud 140. Strength can be improved.

In addition, when the protrusion 131 is inserted into the groove 141, the tip of the protrusion 131 is fixed to the groove 141. Therefore, during the friction stir welding, separation and separation of the protrusion 131 and the groove 141 may be prevented to facilitate welding.

When friction stir welding the blade 130 through the shroud, a plurality of welding lines may be formed on the surface of the shroud 140 after finishing the process. In addition, it is necessary to perform welding on two surfaces of the blade 130 and the shroud 140 in contact with each other, and thus, an area to which friction stir welding is to be widened may increase the welding process. On the contrary, in the friction stir welding according to the above description, the friction stir welding tool (not shown) can be joined by one friction stir welding process along the tip of the protrusion 131. Time can be reduced.

Referring to the manufacturing method of the impeller assembly 100 according to an embodiment of the present invention. However, the manufacturing method of the impeller assembly 100 is a manufacturing method for the impeller assembly 100 described above, and the portions overlapping with the above description will be omitted and outlined.

First, a step of coupling the blade 130 and the shroud 140 is performed. The blade 130 has a protrusion formed on the top and has a polygonal shape, and the shroud 140 has a groove 141 corresponding to the shape of the protrusion 131. The protrusion 131 may be inserted into the groove 141 to be coupled to the blade 130 and the shroud 140. In this case, a tag welding process may be further added to temporarily fix the inserted blade 130 and the shroud 140.

Thereafter, the protrusion 131 and the groove 141 are bonded to each other by friction stir welding. When friction stir welding tools (not shown) perform friction stir welding along the tip of the protrusion 131, the material around the protrusion 131 and the material around the groove 141 are melted and agitated by friction to be joined. . Since the method of the friction stir welding process and the friction stir welding tool used can be commonly used as well as the conventional friction stir welding process and the friction cross welding tool used in the impeller fabrication process, a detailed description of the operation principle and structure is described here. Omit.

Thereafter, the outer circumferential surface of the shroud 140 is cut to correspond to the outer circumferential surface of the base part 120 to remove the hole generated during the friction stir welding.

The friction stir welding is agitated and joined by frictional heat issued by the rotation of the friction stir welding tool. Therefore, when the friction stir welding tool is removed after the friction stir welding is completed, a hole 210 in which the friction stir welding tool is removed is formed in the shroud 140. Therefore, in order to remove the hole 210 generated in the shroud 140, the outer peripheral surface of the shroud 140 is cut in the direction A to correspond to the outer peripheral surface of the base portion 120. (See Figure 3)

To this end, the outer diameter of the shroud 140 may be formed larger than the outer diameter of the base 120 to secure the cut portion 142 of the shroud 140. When the friction stir welding is completed, the hole 210 may be formed in the cutout 142, and the cutout 142 may be removed.

The impeller assembly 100 and the method of manufacturing the impeller assembly 100 are fixed to the groove 141 at the time of friction stir welding, and easily recognize the position at which the welding is performed, so that the friction stir welding can be easily performed. Can be.

The impeller assembly 100 and the method of manufacturing the impeller assembly 100 may increase the bonding strength by widening the contact area between the blade 130 and the shroud 140.

The impeller assembly 100 and the method of manufacturing the impeller assembly 100 may join the blade 130 and the shroud 140 through a single welding process along the protrusion 131 during friction stir welding. It can reduce and minimize the heat deformation occurring during the welding process.

The method of manufacturing the impeller assembly 100 may reduce the manufacturing time of the impeller assembly 100 by easily removing the hole 210 in which the friction stir mechanism generated after the friction stir welding is omitted.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will include such modifications and variations as long as they fall within the spirit of the invention.

According to one embodiment of the present invention, it is possible to minimize the heat deformation generated when using friction stir welding, and the embodiments of the present invention can be applied to all power generation systems, gas turbine systems and the like having an impeller assembly for industrial use. have.

Claims

A base portion;

A blade installed on the base portion;

It is disposed spaced apart from the base portion, a portion of the blade is inserted into and coupled to the shroud;

The blade has a protrusion formed to be inserted into the shroud,

Said shroud having a groove into which said protrusion is inserted and joined by friction stir welding.
According to claim 1,

The protrusion is formed in a polygonal shape at the end of the blade, the groove is formed in the shape corresponding to the protrusion, impeller assembly.
In the impeller assembly manufacturing method having a blade having a protrusion formed in a polygonal shape at the end and a shroud having a groove corresponding to the shape of the protrusion,

Inserting the protrusion into the groove to join the blade and the shroud;

Joining the protrusion and the groove by friction stir welding; And

Cutting the outer circumferential surface of the shroud to correspond to the outer circumferential surface of the base part to remove a hole generated during friction stir welding.