JPH0634197U - Axial compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the air compression efficiency of an axial flow compressor. [Structure] A ring groove 21 extending in the circumferential direction is provided on the outer side of the rotor 29 so as to face the back surface 25 of the platform 15 of the air compressor blade 8 supported by the rotor 29, and the ring groove 21 has elasticity. A seal ring 22 that is formed in a substantially annular shape so that the diameter of the wire rod that can be changed without connecting both ends is externally fitted, and when the rotor 29 rotates, centrifugal force acts on the seal ring 22 and the seal ring 22 is rotated. 22 is pressed against the back surface 25 of the platform 15 of the air compressor blade 8 to close the gap between the platform 15 and the outer side of the rotor 29, and the air compressor blade 8
The recirculation of air flowing out from the space behind to the front is suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an axial compressor.

[0002]

[Prior art]

 FIG. 4 shows an example of a conventional axial flow compressor, in which 1 is an annular disk which is arranged in the flow passage forming cylinder 2 and is supported so as to be rotatable about the axis X of the flow passage forming cylinder 2. It is the main body.

Reference numeral 3 denotes an annular front spacer which is arranged on the front side A of the disc body 1 coaxially with the disc body 1 and whose rear end is fitted to the outer edge of the front end of the disc body 1. It is an annular rear spacer arranged coaxially with the disc body 1 on the rear side B and having a front end portion fitted to a rear end outer edge portion of the disc body 1.

Reference numeral 5 indicates a rear end of the rear spacer 4, which is disposed coaxially with the disk body 1 and has a front end outer edge fitted to the rear end outer edge of the rear spacer 4 and a protrusion 6 formed at the front end. Is a hollow rear disk connected to the rear end surface of the disk body 1, and the disk body 1, the front spacer 3, the rear spacer 4, and the rear disk 5 constitute a rotor 29.

Reference numeral 7 denotes a dovetail groove which is provided on the outer side portion of the disk body 1 at substantially equal intervals in the circumferential direction and extends in the front-rear direction, and 8 has a blade 30 on the surface of the platform 15 and a dovetail 9 on the back side. 9 is a plurality of axial dovetail type air compressor blades fitted in the dovetail groove 7, the front part of the back surface 25 of the platform 15 is at the rear outer edge of the front spacer 3, and the platform is The rear portion of the back surface 25 of 15 faces the front end outer edge portion of the rear spacer 4.

Reference numeral 10 denotes a circumferentially extending dovetail groove provided on the outer side of the rear disk 5, 11 denotes a blade 31 on the surface of the platform 16 and dovetail 12 on the back side, and the dovetail 12 is the dovetail groove 10 Are a plurality of tangential dovetail type air compressor blades fitted to each other, and the front part and the rear part of the back surface 27 of the platform 16 face the outer part of the rear disk 5.

Reference numeral 13 denotes an air compressor vane which is attached to the inner surface of the flow path forming cylinder 2 at substantially equal intervals in the circumferential direction so as to be located between the air compressor blade 8 and the air compressor blade 11. Reference numeral 14 denotes an air compressor vane mounted on the inner side surface of the flow path forming cylinder 2 at a substantially equal interval in the circumferential direction so as to be located behind the air compressor rotor blade 11.

Reference numeral 17 denotes a space formed on the front side A of the air compressor rotor blade 8 by an inner portion of the flow passage forming cylinder 2 and an outer portion of the front spacer 3, and 18 denotes an air compressor rotor blade 8 and an air compressor. A space formed by the inner side of the flow passage forming cylinder 2 and the outer side of the rear spacer 4 between the air compressor vane 13 and 19 forms a flow passage between the air compressor vane 13 and the air compressor rotor blade 11. A space formed by the inner part of the cylinder 2 and the outer part of the rear spacer 4, 20 is between the air compressor moving blade 11 and the air compressor stationary blade 14, the inner part of the flow path forming cylinder 2 and the rear disk 5 Is a space formed by the outer side of the.

In the axial flow compressor having the above structure, when the rotor 29 including the disk body 1, the front spacer 3, the rear spacer 4, and the rear disk 5 is rotated, the rotor 29 moves from the front A side toward the rear B side. The air flowing in the flow passage forming cylinder 2 is sequentially compressed by the air compressor blades 8 and 11.

Therefore, when the axial compressor is in operation, the space 18 has a higher internal pressure than the space 17, and the space 20 has a higher internal pressure than the space 19.

[0011]

[Problems to be solved by the device]

 However, in the conventional axial flow compressor, between the back surface 25 of the platform 15 of the air compressor blade 8 and the front spacer 3 or the rear spacer 4, and between the back surface 25 of the platform 15 and the outer portion of the disk body 1. , And a gap is formed between the back surface 27 of the platform 16 and the rear disk 5 and the outer portion, respectively.

Therefore, the air compressed by the air compressor rotor blades 11 is recirculated from the space 20 to the space 19 having a lower internal pressure than the space 20 along the back surface 27 of the platform 16, and the same recirculation occurs. Then, the air compressed by the air compressor blade 8 flows out from the space 18 to the space 17 whose internal pressure is lower than that of the space 18 along the back surface 25 of the platform 15 and recirculation occurs, so that the axial compressor Air compression efficiency decreases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an axial flow compressor capable of suppressing recirculation of air and improving air compression efficiency.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, in the axial compressor of the present invention, a rotor rotatably supported inside the flow path forming cylinder and provided with a dovetail groove on the outside, and a blade on the surface of the platform. Further, a plurality of air compressor blades having a dovetail on the back side and the dovetails fitted in the dovetail grooves, and a peripheral portion on the inner side of the flow path forming cylinder so as to be located on the rear side of the air compressor blades. A plurality of air compressor vanes provided at substantially equal intervals in the direction, a ring groove extending in the circumferential direction formed on the outer side of the rotor so as to face the back surface of the platform of each air compressor blade, and A wire rod having a substantially annular shape so that the diameter can be changed without connecting the both ends, and a seal ring fitted to the ring groove. Air compressor operation The rear surface of the platform and the are configured so as to abut on the rear side of the wall portion of the ring groove.

[0015]

[Action]

 In the axial compressor of the present invention, when the rotor rotates, centrifugal force acts on the seal ring fitted in the ring groove, and the seal ring is pressed against the back surface of the platform of the air compressor blade. The gap between the rotor and the outer part of the rotor is closed.

Therefore, the recirculation of the air flowing out from the space behind the air compressor blade to the space in front thereof is suppressed.

[0017]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the axial flow compressor of the present invention, in which the same reference numerals as those in FIG. 4 represent the same parts.

Reference numeral 21 denotes a ring groove 22 extending in the circumferential direction, which is formed at the front end of the outer side of the rear spacer 4 so as to face the rear end of the back surface 25 of the platform 15 of the air compressor blade 8. This is a seal ring in which a metal wire is formed in a substantially annular shape so that the diameter can be changed without connecting both ends, and the seal ring 22 is fitted on the ring groove 21 (see FIG. 2 etc.).

The back surface 25 of the platform 15 has a shape that separates from the axis X of the flow path forming cylinder 2 as it goes from its front end to its rear end, and the seal ring 22 is driven by the elastic force of the metal wire rod. The back surface 25 of the platform 15 and the wall portion 26 of the ring groove 21 near the rear side are in contact with each other.

Reference numeral 23 is a ring groove extending in the circumferential direction formed on the outer side of the rear disk 5 so as to face the rear end of the back surface 27 of the platform 16 of the air compressor blade 11, and 24 is a metal wire rod having high elasticity. Is a seal ring formed in a substantially annular shape so that the diameter can be changed without connecting both ends, and the seal ring 24 is fitted on the ring groove 23 (see FIG. 3, etc.).

The back surface 27 of the platform 16 has a shape that separates from the axis X of the flow path forming cylinder 2 as it goes from the front end to the rear end thereof, and the seal ring 24 is driven by the elastic force of the metal wire rod. The back surface 27 of the platform 16 and the wall portion 28 of the ring groove 23, which is closer to the rear side, are in contact with each other.

In the axial compressor of the present embodiment, when the rotor 29 composed of the disk body 1, the front spacer 3, the rear spacer 4, and the rear disk 5 rotates, the rotor 29 moves from the front A side toward the rear B side. The air flowing in the flow passage forming cylinder 2 is sequentially compressed by the air compressor blades 8 and 11.

At this time, the seal rings 22 and 24 also rotate together with the rear spacer 4 and the rear disc 5, and when the number of rotations of the rear spacer 4 and the rear disc 5 increases, centrifugal force acts on the seal rings 22 and 24. .

Therefore, the seal ring 22 is pressed against the back surface 25 of the platform 15 and the rear wall portion 26 of the ring groove 21 by the centrifugal force, and the seal ring 24 is also ring-shaped with the back surface 27 of the platform 16 by the centrifugal force. By being pressed against the rearward wall portion 28 of the groove 23, both the gap between the platform 15 and the rear spacer 4 and the gap between the platform 16 and the rear disc 5 are closed by the sealing rings 22, 24. It

As described above, in this embodiment, both the gap between the platform 15 and the rear spacer 4 and the gap between the platform 16 and the rear disk 5 are closed by the seal rings 22 and 24. Therefore, the recirculation of the air flowing out from the spaces 20, 18 to the spaces 19, 17 whose internal pressure is lower than the spaces 20, 18 is suppressed, and as a result, the air compressor efficiency of the axial compressor is improved.

It should be noted that the axial compressor of the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0028]

[Effect of device]

 As described above, according to the axial compressor of the present invention, various excellent effects as described below can be obtained.

(1) When the rotor rotates, centrifugal force acts on the seal ring to press the seal ring against the back surface of the platform of the air compressor blade, and the seal ring causes a gap between the platform and the outer portion of the rotor. Since the gap is closed, recirculation of air flowing from the space behind the air compressor blade to the space in front of the blade is suppressed.

(2) Since the recirculation of the air flowing out from the space behind the air compressor blade to the space in front of the air compressor blade is suppressed, the air compression efficiency of the axial compressor is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an axial compressor of the present invention.

FIG. 2 is a detailed view of the seal structure of the axial dovetail type air compressor rotor blade of the axial flow compressor shown in FIG.

FIG. 3 is a detailed view of a seal structure of a tangential dovetail type air compressor blade of the axial flow compressor shown in FIG.

FIG. 4 is a sectional view showing an example of a conventional axial flow compressor.

[Explanation of symbols]

 2 flow path forming cylinder 7,10 dovetail groove 8,11 air compressor blade 9,12 dovetail 13,14 air compressor stationary blade 15,16 platform 21,23 ring groove 22,24 seal ring 25,27 back surface 26,28 Wall 30, 31 Blade

Claims (1)

[Scope of utility model registration request] 1. A rotor rotatably supported inside a flow path forming cylinder and having a dovetail groove on an outer side thereof; A plurality of fitted air compressor blades, and a plurality of air compressor vanes provided on the inner side of the flow passage forming cylinder at substantially equal intervals in the circumferential direction so as to be located on the rear side of the air compressor blades. A circumferentially extending ring groove formed on the outer side of the rotor so as to face the back surface of the platform of each air compressor blade, and the diameter of the ring may change without connecting both ends of the elastic wire. As described above, the seal ring is formed in a substantially annular shape and is fitted into the ring groove, and when the rotor rotates, the seal ring is provided on the rear surface of the platform of each air compressor blade and on the rear side of the ring groove. An axial flow compressor characterized in that it is configured to abut against the wall portion of the cylinder.