KR102260315B1 - Centrifugal compressor - Google Patents

Abstract

The present invention relates to a centrifugal compressor which comprises: an impeller connected to a rotary shaft, and having a plurality of blades; a scroll which rotatably supports the rotary shaft; a diffuser plate engaged with an inner space of the scroll, and having a plurality of first vanes (150) of which the center part is opened to allow the impeller to be inserted and which are placed apart from each other in a circumferential direction; and a shroud placed apart from the diffuser plate (100) and engaged with the scroll (400), and having a plurality of second vanes placed on a surface facing the diffuser plate (100) without being overlapped with the first vanes (150). When the shroud is engaged with the scroll, two transfer flow paths are formed by the second vanes placed between two adjacent first vanes. The present invention aims to provide a centrifugal compressor which is able to easily correspond to an operation environment.

Description

Centrifugal Compressor {CENTRIFUGAL COMPRESSOR}

The present invention relates to a centrifugal compressor, and more particularly, to a centrifugal compressor in which a shape of a fluid transfer path can be easily changed by a first vane of a diffuser plate and a second vane of a shroud.

A centrifugal compressor is a device that compresses a fluid by applying a centrifugal force to the fluid using an impeller performing a rotational motion, and is widely used throughout industry.

A centrifugal compressor includes a configuration in which an impeller and a diffuser are located inside a shroud.

The impeller has a plurality of blades or blades, and while rotating, accelerates the fluid in the centrifugal direction.

The diffuser has diffuser vanes disposed around the outer periphery of the impeller, the diffuser vanes decelerating the fluid accelerated by the impeller. In this process, the kinetic energy of the fluid is converted into pressure, and the pressure of the fluid increases.

One aspect of the present invention is to provide a centrifugal compressor that facilitates a change in the shape of a transmission flow path formed between a diffuser plate and a shroud, thereby facilitating a response to the operating environment of the compressor.

A centrifugal compressor according to an embodiment of the present invention is coupled to an internal space of an impeller 300 connected to a rotating shaft and having a plurality of blades, a scroll 400 rotatably supporting the rotating shaft, and the scroll 400 . However, the center 110 is opened so that the impeller 300 can be inserted, the diffuser plate 100 having a plurality of first vanes 150 spaced apart along the circumferential direction, and the diffuser plate 100 and A shroud provided with a plurality of second vanes 250 disposed so as not to overlap with the first vane 150 on a surface facing the diffuser plate 100 and disposed in a spaced apart state to be coupled to the scroll 400 ( 200).

At this time, when the shroud 200 is coupled to the scroll 400, the two transmission passages P by the second vane 250 positioned between the two first vanes 150 adjacent to each other. is formed

According to an embodiment of the present invention, two or more grooves are formed between two first vanes 150 adjacent to each other in the diffuser plate 100 , and the second vane 250 may be fitted into the grooves. A coupling pin 260 of a protruding shape may be formed so as to be there.

According to an embodiment of the present invention, the groove includes two flow paths P1 having the same structure by the two first vanes 150 and the second vane 250 fitted therebetween. Two transmission passages having different structures by the first groove 120 and the two first vanes 150 formed at the position to be formed, and the second vane 250 fitted therebetween ( A second groove 130 formed at a position to form P2 and P3 may be included.

According to an embodiment of the present invention, the diffuser plate 100 includes a first region 101 in which the first groove 120 is formed and a second region 102 in which the second groove 130 is formed. divided, and an area occupied by the first region 101 may be larger than an area occupied by the second region 102 .

According to an embodiment of the present invention, among the two or more second grooves 130 formed between the first vanes 150 , any one of the second grooves 131 is located at one side of the first vane 150 . It is formed to be deflected toward the leading edge 151 , and the transmission passages P2 and P3 having different structures may be formed by the two first vanes 150 and the second vane 250 .

According to an embodiment of the present invention, in the process of coupling the shroud to the scroll, the flange part of the shroud is coupled to the coupling part of the scroll on the outside, and the coupling pin of the second vane is coupled to the groove of the diffuser plate on the inside. Therefore, it is possible to maintain a strong bonding structure.

According to an embodiment of the present invention, by changing the position where the second groove is formed, it is possible to change the shape of the transmission flow path formed by the two first vanes and the second vane disposed therebetween. Accordingly, it is possible to respond flexibly by changing the shape of the delivery passage in response to the operating environment required for the compressor.

1 is an exploded perspective view of a shroud scroll coupling structure constituting a centrifugal compressor according to an embodiment of the present invention.
2 is a side cross-sectional view of a coupling structure of a shroud and a scroll according to an embodiment of the present invention.
3 is a perspective view of a structure in which a second vane is formed on a shroud according to an embodiment of the present invention.
4 is an exploded view of the coupling structure of the second vane and the diffuser plate of the shroud according to an embodiment of the present invention.
FIG. 5 is a plan view of the diffuser plate in which the impeller of FIG. 1 is positioned at the center;
FIG. 6 is a view showing a first area and a second area dividing the diffuser plate of FIG. 5 .

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In the present specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

1 is an exploded perspective view of a shroud scroll coupling structure constituting a centrifugal compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the shroud scroll coupling structure of FIG. 1 viewed from the side, and FIG. 3 is FIG. 1 It is a perspective view of the structure in which the second vane is formed on the shroud of the

1 and 2 together, the centrifugal compressor according to an embodiment of the present invention includes an impeller 300, a scroll 400, a diffuser plate 100 having a vane, and a shroud 200 made of structure

The impeller 300 is connected to the rotation shaft 310 and includes a plurality of blades 320 . The rotating shaft 310 rotates the impeller 300 by receiving power from a driving unit (not shown) composed of a motor and a gear.

The scroll 400 rotatably supports the rotation shaft 310 of the impeller 300 .

The diffuser plate 100 may be installed in the inner space of the scroll 400 . Specifically, the diffuser plate 100 may be installed on the scroll 400 side in the transmission passage P formed between the scroll 400 and the shroud 200 to be described later. The diffuser plate 100 may include a plurality of first vanes 150 that guide the fluid discharged from the impeller 300 to the volute 430 of the scroll 400 .

First, the diffuser plate 100 is formed in a thin disc shape with the central part 110 open so that the impeller 300 can be inserted into or passed through the diffuser plate 100 .

And, the diffuser plate 100 is provided with a plurality of first vanes 150 arranged in a circumferential direction along the circumferential direction with the impeller 300 positioned at the center as the center.

The first vanes 150 are spaced apart from each other and arranged along the circumferential direction so that spaces provided between the first vanes 150 may have the same structure. The interval between the first vanes 150 may be determined in consideration of the fact that a groove, which will be described later, is formed between the first vanes.

The first vane 150 may be integrally formed with the diffuser plate 100 , or the first vane 150 may be detachably coupled to the diffuser plate 100 . The first vane 150 may be detachably coupled to the diffuser plate 100 . ) has a cross section of an airfoil (airfoil) shape, but is not limited thereto, and may have a cross section of another shape in the form of a wedge. The first vanes 150 may be formed to have the same size and shape as each other.

At this time, in the first vane 150 having an airfoil-shaped cross section, a portion formed close to the central portion of the diffuser plate 100 is a leading edge 151 , and a portion farther from the central portion is a trailing edge 152 . named as (see FIG. 6).

The first vane 150 is a configuration formed on the diffuser plate 100. Compared with the second vane 250, which will be described later, the formed position is different from each other, but both configurations have a transmission path ( It is a configuration for forming P).

Next, the shroud will be described.

The shroud 200 is coupled to the scroll 400 while being spaced apart from the diffuser plate 100 by a predetermined distance. A distance between the shroud 200 and the diffuser plate 100 may be the same as the height of the first vane 150 .

The shroud 200 is coupled to the scroll 400 to form a space for accommodating the impeller 300 and the diffuser plate 100 .

The shroud 200 has a shape including an inlet part 210 through which a fluid is introduced, a body part 220 inserted into the inner space of the scroll 400 , and a flange part 230 coupled to the scroll 400 . is formed with

Each of these components is a part of the shape constituting the outer shape of the shroud, and is classified according to the outer shape, form, shape and performance function of each component.

First, the inlet 210 has a hollow structure in which both ends are open. One side of the open fluid flows in and passes through, and a portion of the impeller 300 may be inserted into the other side opposite to it.

At this time, since the gap between the impeller 300 and the shroud 200 greatly affects the efficiency of the centrifugal compressor, a predetermined gap is formed between the inlet 210 and the impeller 300 in consideration of this. As much as possible, the impeller 300 may be inserted into the inlet 210 .

Accordingly, the inner portion of the inlet 210 can maintain a gap with the impeller 300, more precisely, a plurality of blades 320 provided in the impeller 300 and formed in a curved shape and a predetermined gap can keep

The main body 220 has a circular cross-sectional area, forms a protruding external shape, is inserted into the inner space 410 of the scroll 400, and can be disposed at a position facing the diffuser plate 100 have.

The main body 220 has a flat surface facing the diffuser plate 100 , and is referred to as a main body surface 221 for convenience. A plurality of second vanes 250 having an airfoil-shaped horizontal cross-sectional area may be provided on the body surface 221 in a circumferential direction.

In this case, the second vane 250 should not overlap the first vanes 150 provided on the diffuser plate 100 facing each other while the shroud 200 is coupled to the scroll 400 . .

Accordingly, the second vane 250 may be provided on the shroud 200 so as not to overlap the first vane 150 , and a detailed description thereof will be provided later.

The flange part 230 extends from the body part 220 to form a flange-shaped external shape, and is coupled to the coupling part 420 of the scroll 400 . In a state in which the shroud 200 is inserted into the inner space of the scroll 400, the flange portion 230 and the coupling portion 420 may be coupled to each other by fastening members B such as bolts, nuts, and rivets. have.

Next, when the shroud is coupled to the scroll, a process in which the transmission path P is formed by the first vane and the second vane will be described.

FIG. 5 is a plan view of a diffuser plate in which the impeller of FIG. 1 is positioned at a central portion, and FIG. 6 is a view showing a first region and a second region dividing the diffuser plate of FIG. 5 .

The second vane 250 may have an interval, size, and shape between the second vanes 250 so as not to overlap with the first vane 150 of the diffuser plate 100 , and the shroud 200 ) is coupled to the scroll 400 , the second vane 250 may be positioned between the first vanes 150 spaced apart from each other.

One or more coupling pins 260 having a protruding shape may be formed on an outer surface of the second vane 250 .

Specifically, referring to FIG. 3 , the coupling pin 260 is formed by being deflected toward the leading edge 251 of the second vane 250 and formed by being deflected toward the first coupling pin 261 and the trailing edge 252 . and a second coupling pin 262 .

Two or more grooves 120 and 130 may be formed in the diffuser plate 100 between two adjacent first vanes 150 , and the grooves 120 and 130 are fitted with a coupling pin 260 . It may be formed in a groove structure that can be coupled.

That is, two or more grooves 120 and 130 may be formed in each area formed between the two first vanes 150 adjacent to each other or facing each other.

Accordingly, while the shroud 200 is coupled to the scroll 400 , the coupling pin 260 of the second vane 250 may be fitted into the grooves 120 and 130 . This structure is, While the shroud 200 is mounted and coupled to the scroll 400 , the coupling pin 260 may perform a function of guiding the coupling. In addition, the shroud 200 and the scroll 400 are coupled to the flange portion 230 on the outside, and the coupling pin 260 is coupled to the grooves 120 and 130 on the inside, so that the coupling structure is can be solid.

Next, when the shroud 200 is mounted on the scroll 400 , the second vane 250 is coupled to which part of the diffuser plate 100 (that is, the coupling position of the second vane) and the coupling. The degree of inclination of the second vane 250 will be described.

When the shroud 200 is coupled to the scroll 400 , the second vane 250 is positioned between the two first vanes 150 , and thus two transmission paths P are formed. .

That is, according to the position where the second vane 250 is coupled to the diffuser plate 100 , or the degree to which the second vane 250 is inclined when the second vane 250 is coupled to the diffuser plate 100 , the transmission flow path The shape of (P) is determined, and by setting these factors (the coupling position of the second vane, the degree of inclination) differently, it is possible to adjust the shape of the transmission flow path (P).

As a factor for controlling the shape of the transmission passage P, a groove for determining the coupling position of the second vane will be described.

First, the groove is provided at a position to form two transmission passages P1 having the same structure as each other by the two first vanes 150 and the second vane 250 fitted therebetween. 1 groove 120, two first vanes 150 and the second vane 250 fitted therebetween to form two flow paths (P2, P3) having different structures and a second groove 130 provided therein.

In this case, the area in which the first groove 120 is formed is referred to as a first area 101 , the area in which the second groove 130 is formed is referred to as a second area 102 , and the first area 101 is referred to as the second area 102 . ) and the second area 102 divide the area of the diffuser plate 100 .

5 and 6 together, the area occupied by the first area 101 may be larger than the area occupied by the second area 102 . In the first region 101 , two transmission passages P1 identical to each other may be formed, and in the second region 102 , two different transmission passages P2 and P3 may be formed.

First, two first grooves 121 and 122 are formed between any two first vanes 150A and 150B adjacent to each other in the first region 101 . At this time, the first grooves 121 and 122 are not formed at positions biased toward either side among the first vanes 150A and 150B located on both sides.

Here, assuming that the second vane 250 is fitted to the first grooves 121 and 122 , the position of the coupled second vane 250 is indicated by a dotted line.

Assuming that the second vane 250 is coupled to the portion indicated by the dotted line, the second vane 250 is positioned between the two first vanes 150A and 150B in the first region 101, and each other Two transmission passages P1 having the same structure are formed.

Next, two second grooves 131 and 132 are formed between any two first vanes 150C and 150D adjacent to each other in the second region 102 . In this case, the second grooves 131 and 132 are formed at positions biased toward one side among the first vanes 150C and 150D adjacent to each other.

When the position of the second vane 250 coupled to the second groove 130 is indicated by a dotted line, the second vane 250 is located between the two first vanes 150C and 150D in the second region 102 . ), the transmission passages P2 and P3 of different shapes are formed.

For example, when the second groove 131 of any one of the two second grooves 131 and 132 is formed at a position biased toward the leading edge 151D of the first vane 150D located on the right side, the two second grooves 131 Two transmission passages P2 and P3 having different shapes are formed between the first vanes 150C and 150D.

Although the content of the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: diffuser plate 101: first area
102: second area 120: first groove
130: second groove 150: first vane
200: shroud 210: inlet
220: body portion 230: flange portion
250: second vane 260: coupling pin
261: first coupling pin 262: second coupling pin
261: first coupling pin 262: second coupling pin
300: impeller 400: scroll
P1, P2, P3: delivery path

Claims (5)

Impeller 300 connected to the rotating shaft and having a plurality of blades;
a scroll 400 for rotatably supporting the rotation shaft;
As a diffuser plate 100 coupled to the inner space of the scroll 400, the center 110 is opened so that the impeller 300 can be inserted, and a plurality of first vanes 150 are spaced apart along the circumferential direction. a diffuser plate 100 having two or more grooves 120 and 130 formed between the two adjacent first vanes 150; and
The diffuser plate 100 and the first vane 150 are spaced apart from each other by a distance equal to the height of the diffuser plate 100 and coupled to the scroll 400 , but on the surface facing the diffuser plate 100 , the first vane 150 and a shroud 200 provided with a plurality of second vanes 250 arranged in a circumferential direction so as not to overlap;
including,
A coupling pin 260 having a protruding shape to be fitted into the grooves 120 and 130 is formed in the second vane 250 , and the coupling pin 260 is a leading edge of the second vane 250 . (251) comprising a first coupling pin 261 formed biased toward the side and a second coupling pin 262 formed biased toward the trailing edge 262,
When the shroud 200 is coupled to the scroll 400 , the first coupling pin 261 and the second coupling pin 262 are fitted into the grooves 120 and 130 and two first vanes adjacent to each other. Two transmission passages (P) are formed by the second vanes (250) positioned between (150),
The grooves 120 and 130 are,
Two first grooves 121 formed at a position to form two transmission passages P1 having the same structure by the two first vanes 150 and the second vane 250 positioned therebetween , 122); and
Two second grooves 131 for forming two transmission passages P2 and P3 having different structures by the two first vanes 150 and the second vane 250 positioned therebetween. , 132), a second groove 131 in which any one of the second grooves 131 and 132 is formed to be deflected toward the leading edge 151 of the first vane 150 located on one side. , 132);
Containing, centrifugal compressor.
delete delete According to claim 1,
The diffuser plate 100,
It is divided into a first area 101 in which the first groove 120 is formed and a second area 102 in which the second groove 130 is formed, and the area occupied by the first area 101 is a second area. A centrifugal compressor formed to be larger than the area occupied by the region (102).
delete

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