CN212389568U - Centrifugal compressor sealing device, centrifugal compressor and gas turbine - Google Patents
Centrifugal compressor sealing device, centrifugal compressor and gas turbine Download PDFInfo
- Publication number
- CN212389568U CN212389568U CN202021657120.6U CN202021657120U CN212389568U CN 212389568 U CN212389568 U CN 212389568U CN 202021657120 U CN202021657120 U CN 202021657120U CN 212389568 U CN212389568 U CN 212389568U
- Authority
- CN
- China
- Prior art keywords
- centrifugal compressor
- working medium
- sealing
- sealing part
- diffuser
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a centrifugal compressor device, centrifugal compressor and gas turbine of obturaging. The sealing device of the centrifugal compressor comprises a sealing part arranged between an impeller hub and a diffuser body; in the upward direction of the leakage flow of the working medium, the sealing part is arranged in front of the sealing labyrinth; the sealing part is arranged on the diffuser body and is provided with an annular structure, and the sealing part is provided with a wide and narrow working medium channel so as to convert the pressure energy of the working medium flowing through the sealing part into kinetic energy. The utility model discloses a device of obturating of centrifugal compressor, the working medium flows through behind the portion of obturating and flows the velocity of flow increase, and the pressure energy of working medium turns into kinetic energy, and the static pressure of working medium obtains reducing, and working medium and the collision of the labyrinth of obturating afterwards, most kinetic energy are dissipated and fall to total pressure between impeller wheel hub and the diffuser body reduces by a wide margin, and the differential pressure around the labyrinth of obturating obtains reducing by a wide margin, and then promotes the effect of obturating, has reduced centrifugal compressor's efficiency loss.
Description
Technical Field
The utility model relates to a gas turbine technical field especially relates to a centrifugal compressor device, centrifugal compressor and gas turbine of obturaging.
Background
The gas turbine is a rotary power machine which takes continuously flowing gas as a working medium and converts heat energy into mechanical work, and generally comprises three parts, namely a gas compressor, a combustion chamber and a gas turbine. Among them, the commonly used compressors are a centrifugal compressor and an axial compressor.
The existing centrifugal compressor utilizes blade force and centrifugal force to complete the conversion of mechanical energy into gas enthalpy energy. Working medium, such as air, enters the centrifugal compressor, flows through the impeller, is greatly increased in pressure, and then enters the diffuser. At this time, because a gap exists between the impeller and the diffuser, and the air pressure of the working gas is far higher than the outside, part of the working gas flows out from the gap between the impeller and the diffuser, so that the efficiency loss of the centrifugal compressor is caused.
For gas leakage of a centrifugal compressor, the sealing mode adopted at present is that a sealing labyrinth is arranged on a cavity between an impeller and a diffuser, and a thicker boundary layer is induced by using wall surface friction force formed by the sealing labyrinth and a rotating piece to form pneumatic blockage so as to reduce leakage flow. However, because the sealing effect of the sealing labyrinth is limited, the pressure difference between the front and the rear of the sealing labyrinth is still large, a large part of gas which is used for doing work flows out from the gap and then flows through the sealing labyrinth to be leaked to the atmosphere, and the efficiency loss of the centrifugal compressor is still large.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a centrifugal compressor device, centrifugal compressor and gas turbine of obturaging has solved the great problem of centrifugal compressor's efficiency loss.
On one hand, the embodiment of the utility model provides a centrifugal compressor seals device, including the portion of obturating that sets up between impeller wheel hub and diffuser body; in the upward direction of the leakage flow of the working medium, the sealing part is arranged in front of the sealing labyrinth; the sealing part is arranged on the diffuser body and is provided with an annular structure, and the sealing part is provided with a wide and narrow working medium channel so as to convert the pressure energy of the working medium flowing through the sealing part into kinetic energy.
According to the utility model discloses an aspect, the portion of obturating includes a plurality of diffusion blades, and a plurality of diffusion blades set up in the diffuser body, and encircle impeller wheel hub's axial setting.
According to the utility model discloses an aspect, a plurality of diffusion blade intervals set up, and the clearance between the adjacent diffusion blade constitutes working medium passageway, and on the leakage flow of working medium, the clearance between the adjacent diffusion blade is narrowed by the width.
According to an aspect of the embodiments of the present invention, the pitch of adjacent diffuser blades is the same.
According to the utility model discloses an aspect, diffuser blade sets up for impeller wheel hub's radial direction slope.
According to the utility model discloses an aspect, the direction that working medium flowed out by the clearance between the adjacent diffusion blade is complied with impeller wheel hub's direction of rotation.
According to one aspect of the embodiment of the utility model, a sealing rib is arranged between the sealing part and the sealing labyrinth; the sealing rib is arranged on the impeller hub and can rotate along with the rotation of the impeller hub.
According to the utility model discloses an aspect, the rib of obturating is continuous annular structure, encircles impeller wheel hub's axial setting.
On the other hand, the embodiment of the utility model provides a centrifugal compressor is proposed, include like aforementioned centrifugal compressor device of obturaging.
In another aspect, an embodiment of the present invention provides a gas turbine, including a centrifugal compressor as described above.
The embodiment of the utility model provides a device is obturated to centrifugal compressor, the portion of obturating has the working medium passageway by wide narrowing, the velocity of flow increases behind the portion of obturating is flowed through to the working medium, the pressure energy of working medium turns into kinetic energy, the static pressure of working medium obtains reducing, working medium and the collision of the labyrinth of obturating afterwards, the fractional kinetic energy of working medium turns into pressure energy, most kinetic energy is dissipated, thereby total pressure between impeller wheel hub and the diffuser body reduces by a wide margin, and because kinetic energy dissipation, the static pressure of working medium equals always to press basically, namely, the static pressure reduces by a wide margin, the differential pressure around the labyrinth of obturating obtains reducing by a wide margin, and then promote the effect of obturating, reduce the leakage flow, the loss of efficiency of centrifugal compressor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic sectional structure view of a sealing device of a centrifugal compressor according to an embodiment of the present invention.
Fig. 2 is a left side view structural diagram of the diffuser body part structure of the centrifugal compressor sealing device according to the embodiment of the present invention.
In the drawings:
100-impeller hub, 200-diffuser body, 300-sealing labyrinth, 400-sealing part, 500-sealing rib and 600-impeller;
410-diffuser blades;
411-first end, 412-second end.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, the terms "first" and "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; "plurality" means two or more; the terms "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Referring to fig. 1, the sealing device for a centrifugal compressor according to an embodiment of the present invention includes a sealing portion 400 disposed between an impeller hub 100 and a diffuser body 200; in the leakage flow direction of the working medium, the sealing part 400 is arranged in front of the sealing labyrinth 300; the sealing part 400 is disposed on the diffuser body 200, the sealing part 400 has an annular structure, and the sealing part 400 has a wide and narrow working medium passage to convert pressure energy of the working medium flowing through the sealing part 400 into kinetic energy. The working medium of the embodiment leaks into the cavity between the impeller hub 100 and the diffuser body 200 from the narrow gap A between the impeller hub 100 and the diffuser body 200, because the static clearance is smaller and the boundary layer is thicker, the working medium has circumferential speed under the action of the friction force of the impeller hub 100 and then enters the sealing part 400 at a flow angle which can be calculated, the sealing part 400 is provided with a working medium channel which is narrowed by width, the flow velocity of the working medium is increased after the working medium flows through the sealing part 400, the pressure energy of the working medium is converted into kinetic energy, the static pressure of the working medium is reduced, then the working medium collides with the sealing labyrinth 300, a small part of the kinetic energy of the working medium is converted into pressure energy, and most of the kinetic energy is dissipated, so that the total pressure between the impeller hub 100 and the diffuser body 200 is greatly reduced, and because the kinetic energy is dissipated, the static pressure of the working medium is basically equal to the total pressure, namely, the, and further, the sealing effect is improved, the leakage flow is reduced, the efficiency loss of the centrifugal compressor is reduced, and the efficiency of the centrifugal compressor is improved.
As an alternative embodiment, the sealing portion 400 includes a plurality of diffuser blades 410, and the plurality of diffuser blades 410 are disposed on the diffuser body 200 and surround the impeller hub 100 in the axial direction.
The plurality of diffuser blades 410 of the present embodiment form a ring structure around the axial direction of the impeller hub 100, and the ring structure is disposed on the diffuser body 200; the number of the diffuser blades 410 is plural, and the specific number can be determined according to specific parameters of the centrifugal compressor.
As an alternative embodiment, a plurality of diffuser blades 410 are arranged at intervals, gaps between adjacent diffuser blades 410 form a working medium channel, and in the leakage flow direction of the working medium, the gaps between adjacent diffuser blades 410 are narrowed from wide.
The gap between adjacent diffuser blades 410 of the embodiment forms a working medium channel, the gap between adjacent diffuser blades 410 is narrowed from wide to narrow to obtain a working medium channel narrowed from wide, and the flow velocity of the working medium flowing through the working medium channel is increased to convert the pressure energy of the working medium into kinetic energy.
The structural form of the diffuser blade 410 is not limited, and the diffuser blade 410 may be planar, curved, or the like, and may convert the pressure energy of the flowing working medium into kinetic energy.
As an alternative embodiment, the spacing between adjacent diffuser blades 410 is the same.
The diffuser blades 410 of the present embodiment are uniformly distributed around the axial direction of the impeller hub 100, and accelerate the flowing working medium uniformly in the radial direction of the impeller hub 100 or in the direction forming an angle with the radial direction.
As an alternative embodiment, diffuser blades 410 are arranged obliquely with respect to the radial direction of impeller hub 100.
In this embodiment, the change of the cross-sectional area of the working medium channel is realized by the inclination angle of the diffuser blade 410, and the cross-sectional area of the working medium channel is narrowed from wide to narrow in the leakage flow direction of the working medium, so that the pressure energy of the working medium is converted into kinetic energy.
It should be noted that the installation angle of the diffuser blade 410 is not limited, but it is ensured that the flow direction of the working medium is substantially along the radial direction of the seal 400.
As an alternative embodiment, the direction of the flow of working fluid out of the gaps between adjacent diffuser blades 410 is compliant with the direction of rotation of impeller hub 100.
In the present embodiment, in the leakage flow direction of the working medium, the diffuser blade 410 sequentially has a first end 411 and a second end 412, and the second end 412 of the diffuser blade 410 is inclined along the rotation direction of the impeller hub 100, which may also be understood as the reverse inclination of the first end 411 of the diffuser blade 410 to the rotation direction of the impeller hub 100, that is, the direction in which the working medium flows out from the gap between the adjacent diffuser blades 410 is consistent with the trend of the rotation direction of the impeller hub 100, and if the impeller hub 100 rotates counterclockwise, the diffuser blade 410 is inclined as shown in fig. 2, and it may be understood that if the impeller hub 100 rotates clockwise, the inclination direction of the diffuser blade 410 is opposite.
As an alternative embodiment, a sealing rib 500 is arranged between the sealing part 400 and the sealing labyrinth 300; the sealing rib 500 is disposed on the impeller hub 100, and the sealing rib 500 can rotate along with the rotation of the impeller hub 100.
In this embodiment, in the upward direction of the leakage flow of the working medium, the sealing rib 500 is disposed between the sealing portion 400 and the sealing labyrinth 300, and the sealing rib 500 is located at the outlet of the sealing portion 400 or at the outlet of the diffuser.
Under the effect of portion 400 of obturating, the pressure energy of working medium converts kinetic energy into, and behind the working medium outflow portion 400 of obturating, the velocity of flow of working medium has certain increase, and the static pressure has certain reduction, and working medium and obturating rib 500 bump afterwards, and most kinetic energy of working medium is dissipated, and a small portion of kinetic energy converts pressure energy into.
As an alternative embodiment, the sealing ribs 500 are a continuous annular structure disposed around the axial direction of the impeller hub 100.
The sealing rib 500 of the present embodiment is a circumferential rotation structure, and dissipates the kinetic energy of the working medium in the radial direction of the impeller hub 100.
In this embodiment, the sectional shape of the sealing rib 500 is not specifically limited, and the sectional shape of the sealing rib 500 may be trapezoidal or triangular, and the kinetic energy of the working medium can be consumed to a greater extent after the sealing rib collides with the working medium.
The radial height of the sealing rib 500 is not particularly limited, but should be sufficient to dissipate the kinetic energy of the working medium without interfering with the normal operation of other components.
On the whole, the centrifugal compressor sealing device of the embodiment considers the friction effect in the cavity between the impeller and the diffuser and the leakage flowing direction of the working medium, the sealing part 400 is used for converting the pressure energy of the working medium into kinetic energy, and then the sealing ribs 500 and the sealing labyrinth 300 are used for dissipating the kinetic energy of the working medium, so that the static pressure in front of the sealing labyrinth 300 is reduced, the pressure difference in front of and behind the sealing labyrinth 300 is greatly reduced, the sealing effect is improved, the leakage flowing is reduced, the efficiency loss of the centrifugal compressor is reduced, and the efficiency of the centrifugal compressor is improved.
The embodiment of the utility model provides a centrifugal compressor is still provided, the centrifugal compressor device of obturaging including above-mentioned embodiment.
In this embodiment, a working medium, such as air, enters the centrifugal compressor, flows through the impeller 600, is greatly increased in pressure, and then enters the vaneless diffuser.
The embodiment of the utility model provides a still provide a gas turbine, including the centrifugal compressor of above-mentioned embodiment, centrifugal compressor's efficiency is higher, and gas turbine's overall efficiency also obtains promoting.
It should be understood by those skilled in the art that the foregoing is only illustrative of the present invention, and the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A sealing device of a centrifugal compressor is characterized by comprising a sealing part arranged between an impeller hub and a diffuser body;
in the leakage flow direction of the working medium, the sealing part is arranged in front of the sealing labyrinth;
the sealing part is arranged on the diffuser body and is provided with an annular structure, and the sealing part is provided with a wide and narrow working medium channel so as to convert the pressure energy of the working medium flowing through the sealing part into kinetic energy.
2. The centrifugal compressor sealing device according to claim 1, wherein the sealing portion includes a plurality of diffuser blades disposed in the diffuser body and surrounding an axial direction of the impeller hub.
3. The centrifugal compressor sealing device according to claim 2, wherein the plurality of diffuser blades are arranged at intervals, gaps between adjacent diffuser blades form a working medium channel, and in the leakage flow direction of a working medium, the gaps between adjacent diffuser blades are narrowed from wide to narrow.
4. The centrifugal compressor sealing device according to claim 3, wherein the adjacent diffuser blades have the same pitch.
5. A centrifugal compressor seal arrangement according to claim 3, wherein the diffuser blades are arranged obliquely with respect to the radial direction of the impeller hub.
6. The centrifugal compressor sealing device according to claim 3 or 5, wherein the direction of the working medium flowing out from the gap between adjacent diffuser blades follows the rotation direction of the impeller hub.
7. The centrifugal compressor sealing device according to claim 1, wherein sealing ribs are arranged between the sealing part and the sealing labyrinth;
the sealing ribs are arranged on the impeller hub and can rotate along with the rotation of the impeller hub.
8. The centrifugal compressor sealing device of claim 7, wherein the sealing ribs are of a continuous annular structure and are arranged around the axial direction of the impeller hub.
9. A centrifugal compressor comprising a centrifugal compressor sealing device according to any one of claims 1 to 8.
10. A gas turbine comprising a centrifugal compressor according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021657120.6U CN212389568U (en) | 2020-08-11 | 2020-08-11 | Centrifugal compressor sealing device, centrifugal compressor and gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021657120.6U CN212389568U (en) | 2020-08-11 | 2020-08-11 | Centrifugal compressor sealing device, centrifugal compressor and gas turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212389568U true CN212389568U (en) | 2021-01-22 |
Family
ID=74253701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021657120.6U Active CN212389568U (en) | 2020-08-11 | 2020-08-11 | Centrifugal compressor sealing device, centrifugal compressor and gas turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212389568U (en) |
-
2020
- 2020-08-11 CN CN202021657120.6U patent/CN212389568U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10260366B2 (en) | Sealing device and turbo machine | |
| US8066475B2 (en) | Labyrinth compression seal and turbine incorporating the same | |
| JP6131177B2 (en) | Seal structure and rotating machine | |
| EP2410126B1 (en) | Turbine wheel | |
| JP2008057416A (en) | Axial flow turbine | |
| US20120121411A1 (en) | Labyrinth Seals for Turbomachinery | |
| JP2015140916A (en) | Seal structure and rotary machine | |
| CN111720175B (en) | Impeller machinery movable vane top seal structure | |
| CN111878449A (en) | Centrifugal compressor sealing device, centrifugal compressor and gas turbine | |
| CN114151142B (en) | Seal assembly and gas turbine | |
| US20060198730A1 (en) | Rotary ram compressor | |
| CN111878451A (en) | Axial compressor sealing device, axial compressor and gas turbine | |
| JP2011052645A (en) | Turbine | |
| CN212389569U (en) | Sealing mechanism, axial flow compressor and gas turbine | |
| JP6518526B2 (en) | Axial flow turbine | |
| CN212389568U (en) | Centrifugal compressor sealing device, centrifugal compressor and gas turbine | |
| CN107654329B (en) | Hydraulic turbine | |
| CN212671868U (en) | Impeller machinery movable vane top seal structure | |
| CN212389571U (en) | Sealing device, centrifugal compressor and gas turbine | |
| CN211288755U (en) | Air path sealing structure of turbine | |
| JP2011247307A (en) | Labyrinth seal device | |
| JP7054582B2 (en) | Sealing device and turbomachinery | |
| CN212389570U (en) | Axial compressor sealing device, axial compressor and gas turbine | |
| JP4240728B2 (en) | 3D axial flow turbine | |
| JP2000073702A (en) | Axial flow turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |