KR20170046433A

KR20170046433A - Compressor for thrust reduction

Info

Publication number: KR20170046433A
Application number: KR1020150146781A
Authority: KR
Inventors: 김재부; 박윤기
Original assignee: 현대중공업 주식회사
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2017-05-02

Abstract

The present invention discloses a thrust reduction compressor. According to the present invention, a thrust reducing member is joined to a shaft system of an impeller, and an air seal whose inner diameter is enlarged is coupled to the outer surface of the thrust reducing member. Accordingly, a high pressure is applied to a rear surface of the impeller from operation of a compressor, and when the thrust is applied to the shaft system due to the high pressure, the pressure is reduced to ensure operational stability of the compressor. In addition, compression efficiency of the compressor is improved while preventing friction loss between the air seal and the shaft system, and when the compressor is configured in a dual, the compressor prevents the net thrust from being diverted from a transient state, thereby improving overall operating performance of the compressor.

Description

[0001] COMPRESSOR FOR THRUST REDUCTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor, and more particularly, to a thruster reducing device for reducing a thrust (high load) applied to a shafting system by connecting a thrust reducing member to an impeller shaft system of a compressor, Compressor.

Generally, a gas or centrifugal compressor (hereinafter referred to as a " compressor ") compresses a fluid such as gas or air introduced from a casing inlet by rotating an impeller having a plurality of blades in a casing by a shaft system. The flow of the fluid is transmitted to the outside through the diffuser and the volute at the casing outlet according to the rotation of the impeller.

That is, the compressor is a device for compressing and producing air or gas and supplying the compressed air or gas to a required place. The compressor is used in various forms throughout the industry, for example, a plant requiring compressed air (gas), a turbo engine, Used to supply compressed air (gas) to pressure vessel for firefighters, and compressor for air conditioner. In other words, it is applied to industrial (air and gas high pressure) compressors, and it is necessary for all of the general plants. It can also be applied to engine superchargers.

However, in the conventional compressor, as shown in Figs. 1 to 3, an air seal 2 is coupled to the shaft system 1, and the air seal 2 is screwed into the scroll casing 2 through the fastening member 6, (High load) is applied to the shaft system 1 due to the high pressure when a high pressure is applied to the rear surface of the impeller 5 from the operation of the compressor, The thrust applied to the air seal 2 is not transmitted to the shaft system 1 and is transmitted to the gear casing 2 when the thrust is applied by the high pressure similarly applied to the air seal 2 coupled to the shaft system 1. [ (4).

Accordingly, in the conventional compressor, a frictional loss occurs between the air seal 2 and the shaft system 1 due to a high-pressure thrust applied to the air seal 2, thereby causing a problem of lowering the compression efficiency. Particularly, 1) is not properly dispersed, the shaft system 1 is significantly affected by the vibration characteristics due to the thrust, and the operation of the compressor becomes unstable during operation of the compressor.

Also, in the case of a dual compressor, the conventional compressor often has a problem that the net thrust is redirected in a transient state and the overall operating performance of the compressor is deteriorated.

Published Patent Publication No. 10-2010-0100239 (published September 15, 2010) Published Japanese Patent Application No. 10-2012-0113878 (Published Oct. 16, 2012)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior arts, and it is an object of the present invention to provide a thrust reduction member which is combined with an axial shaft of an impeller and an air seal whose inner diameter is enlarged on the outer surface of the thrust reducing member. A high pressure is applied to the rear surface of the impeller and when the thrust is applied to the shafting due to the high pressure, it is reduced so that the operation stability of the compressor is ensured and the compression efficiency of the compressor is improved while preventing friction loss between the air seal and the shafting system. The present invention is directed to a thrust reduction compressor which can prevent a net thrust from being diverted from a transient state in a dual configuration.

In order to attain the above object, according to the present invention, there is provided a compressor in which an air seal is disposed in a shaft system of an impeller, and a scroll casing and a gear casing are connected to the air seal, And a thrust reducing member for reducing the thrust when the thrust is applied due to a high pressure applied to the rear surface, wherein the air seal has an inner diameter enlarged, and the air seal having an expanded inner diameter is connected to the scroll casing and the gear casing The thrust reducing member is coupled to the outer circumferential surface of the thrust reducing member.

In addition, the thrust reduction member is integrally combined with the shaft system through shrinkage fitting or machining.

In addition, the thrust reduction member is made of a metal material so as to reduce the amount of change in the shaft dynamic characteristics due to mass and rigidity.

Further, the metallic material is an aluminum alloy or a titanium alloy.

As described above, according to the present invention, after the thrust reducing member is coupled to the shaft of the impeller, an air seal whose inner diameter is enlarged is coupled to the outer surface of the thrust reducing member. Thus, a high pressure is applied to the rear surface of the impeller This reduces the thrust force applied to the shafting system, thereby ensuring the operational stability of the compressor, improving the compression efficiency of the compressor while preventing frictional loss between the air seal and the shafting system, and reducing the net thrust Is prevented from turning in the transient state, thereby improving the overall operating performance of the compressor.

1 is a perspective view showing a structure of a conventional compressor.
2 is a schematic cross-sectional view showing a state in which an air seal is coupled to a conventional impeller shaft system.
3 is an enlarged view showing a state in which a conventional air seal is connected to a scroll casing and a gear casing through a fastening member, respectively.
4 is a perspective view showing a structure of a compressor to which a thrust reduction member is applied to an impeller shaft system according to an embodiment of the present invention.
5 is a schematic cross-sectional view showing a state in which a thrust reduction member and an air seal are applied to an impeller shaft system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a perspective view showing a structure of a compressor to which a thrust reduction member is applied to an impeller shaft system according to an embodiment of the present invention. FIG. 5 is a perspective view showing a state where a thrust reduction member and an air seal are applied to an impeller shaft system Fig.

4 and 5, the thrust reducing compressor A according to the embodiment of the present invention includes a thrust reducing member 60 integrated with the outer circumferential surface of the shaft system 20 of the impeller 10 The air seal 30 having an inner diameter larger than that of the conventional air seal is joined to the outer circumferential surface of the thrust reduction member 60 while the air seal 30 is coupled with the fastening member 6 to the scroll casing 40 and the gear casing 50, respectively.

The thrust reducing member 60 is made of an aluminum alloy or a titanium alloy as a metal material in order to reduce an amount of change in the shaft dynamic characteristics due to mass and rigidity. The thrust reducing member 60 made of the above- and is integrated with the outer circumferential surface of the shaft system 20 through shrinkage fitting or machining.

Hereinafter, a shroud casing 70, which is not illustrated, is shown.

4 and 5, the compressor A according to the embodiment of the present invention configured as described above includes the impeller 10 having the vanes formed by the shaft system 20 in the shroud casing 70 (For example, air) is introduced into the inlet side of the shroud casing 70, a compression operation is performed.

At this time, a high pressure is applied to the rear surface of the impeller 10 by the fluid flowing from the inlet side of the shroud casing 70, and the impeller 10 is rotated due to high pressure applied to the rear surface of the impeller 10 A thrust (high load) is applied to the shafting system 20.

The thrust applied to the shaft system 20 is integrally coupled to the outer circumferential surface of the shaft system 20 and is absorbed by the thrust reduction member 60 made of a metal material such as aluminum alloy or titanium alloy, ).

Since the air seal 30 is connected to the scroll casing 40 and the gear casing 50 via the coupling member 6, the thrust absorbed through the thrust reduction member 60 is transmitted to the air seal The thrust transmitted to the air seal 30 is absorbed by the scroll casing 40 and the gear casing 50 respectively so that the frictional loss due to thrust is reduced in the shafting system 20 , The overall compression efficiency of the compressor (A) can be improved while improving the shaft driving characteristics with respect to the shaft system (20).

Although the technical idea of the thrust reduction compressor of the present invention has been described above with reference to the accompanying drawings, it is to be understood that the present invention is by no means restricted to the most preferred embodiments of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

10; Impeller 20; Shaft
30; Air seal 40; Scroll casing
50; Gear casing 60; Thrust reduction member
70; Shroud casing A; compressor

Claims

An air seal is disposed in a shaft system of an impeller, and a scroll casing and a gear casing are connected to the air seal,
And a thrust reducing member for reducing the thrust when the thrust is applied due to the high pressure applied to the rear surface of the impeller,
Wherein the air seal has an inner diameter enlarged, and the air seal having an expanded inner diameter is coupled to the outer circumferential surface of the thrust reducing member so as to be connected to the scroll casing and the gear casing, respectively.

The thrust reduction compressor according to claim 1, wherein the thrust reduction member is integrally formed with the shaft system through shrinkage fitting or machining.

The thrust reduction compressor according to claim 1, wherein the thrust reducing member is made of a metallic material.

The thrust reduction compressor according to claim 3, wherein the metallic material is an aluminum alloy or a titanium alloy.