CN210564669U

CN210564669U - Blade retainer for impeller machinery

Info

Publication number: CN210564669U
Application number: CN201921233919.XU
Authority: CN
Inventors: 张志鑫; 刘理均; 张晓东; 曾蕴涛
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-05-19
Anticipated expiration: 2029-07-31

Abstract

The utility model provides a blade holder for impeller machinery can be used to keep gas turbine, aeroengine and other impeller machinery's rotor blade in rotor rim plate axial tongue-and-groove, is divided by locking arm, preceding dog, linkage segment, backstop four bibliographic categories and is constituteed, with blade axial fixity, sets up a locking groove at blade root terminal surface, and radial and circumference locking should be used for impeller machinery's blade holder. The holes are not required to be formed in the wheel disc, and any blade can be replaced independently.

Description

Blade retainer for impeller machinery

Technical Field

The utility model belongs to the technical field of impeller machinery blade keeps ware structural design, especially, relate to a blade keeps ware for impeller machinery.

Background

In turbo machinery such as an aircraft engine and a gas turbine, a rotor rotates at a high speed, and a rotor blade in operation generates a large centrifugal force. The use of axial mortises machined in the disk to fix the blades in radial and circumferential directions is a widely proven form of construction. When adopting this kind of structure, the designer needs to solve the problem of blade axial locking.

Generally, the axial locking of the current vane can be divided into two categories. Firstly, an axial baffle or baffle ring mode is adopted; and the second is to adopt a locking sheet. The axial baffle plate is pressed tightly on the end face of the wheel disc by a whole circle of baffle plates through bolts or other modes. The locking mode needs to repeatedly screw bolts or use special tools to operate structures such as snap rings and the like to realize locking when being installed, and has the defects of large workload of installation and decomposition and need of special tools. Meanwhile, the locking mode usually needs to be provided with the device on two sides of the wheel disc, and the overall complexity is further increased. In the aspect of locking sheets, the conventional locking device usually needs two parts to be matched for use or needs to generate permanent plastic deformation in the mounting stage, and the mounting and disassembling workload is large.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a blade that is used for impeller machinery keeps ware that installation and decomposition work load are little, can conveniently decompose single blade, need not to implement plastic deformation to the part at the installation stage.

(II) technical scheme

The utility model provides a blade retainer for impeller machinery, which consists of four parts, namely a locking arm, a front stop block, a connecting section and a rear stop block, wherein the locking arm is provided with a spoon-shaped bend and is vertically connected to the center of one edge of the front stop block; the front check block and the rear check block are rectangular thin sheets, and the front check block and the rear check block are connected together through the connecting section.

The blade retainer for the impeller machine is fixed and circumferentially stopped by a locking groove on the end surface of the blade root.

The rear stop block can be smoothly installed in a gap between the blade root and the mortise along the axial direction under the installation angle vertical to the radial direction of the wheel disc, and the axial movement of the blade can be limited when the rear stop block rotates to the radial direction of the wheel disc.

The front stop block is matched with the rear stop block in the installation completion state, and can limit the axial movement of the blade.

The locking arm, the front stop block and the rear stop block are fixedly connected together by the connecting section in a welding mode, and preferably, the connecting section can also be connected by a precision casting method.

The locking groove can be realized by precision casting, preferably, also can be realized by a milling mode.

The locking arm has proper elasticity, can reduce the assembly difficulty by elastic deformation in the installation stage, can be just clamped in the locking groove to fix the blade retainer at the locking position, and can limit the circumferential movement of the blade retainer of the impeller machine in the operation stage.

The locking arm is provided with an outward small end for installation and disassembly, and the outward small end can be utilized in the installation and disassembly stage, so that the operation of installing, disassembling and disassembling the blade retainer of the impeller machine is simplified.

The locking arm is provided with a stopping edge, a gap is reserved between the stopping edge and the locking groove, the stopping edge can be just clamped into the locking groove, and the locking arm in a working state can be prevented from being separated from the locking groove under the action of centrifugal force.

(III) advantageous effects

According to the above technical scheme, the utility model discloses following beneficial effect has:

(1) the wheel disc is not required to be provided with holes, and other auxiliary mechanisms are not required to be adopted for fixing;

(2) the locking device does not need to be subjected to plastic deformation in the mounting stage;

(3) special tool equipment is not needed for installation and disassembly;

(4) the disassembly and replacement of a single blade can be conveniently realized.

Drawings

FIG. 1 is a schematic view of an axial baffle structure;

FIG. 2 is a schematic view of a conventional locking structure;

FIG. 3 is a schematic view of an axial tongue and groove configuration;

FIG. 4 is a schematic view of the blade retainer of the present invention;

fig. 5 is a schematic view of a locking groove of the present invention;

FIG. 6 is a schematic view of the front baffle side orientation of the blade retainer mounting location of the present invention;

FIG. 7 is a schematic view of the side of the tailgate where the blade retainer is mounted according to the present invention;

fig. 8 is a schematic view of the blade holder of the present invention in the installed position on the front fender side;

FIG. 9 is a schematic view of the side position of the tailgate after the blade retainer of the present invention is installed;

fig. 10 is a detailed view of the locking piece and the locking groove of the blade holder of the present invention.

Description of the symbols

1 locking arm

2 front stop block

3 connecting segment

4 rear stop block

5 locking groove

6 wheel disc

7 blade

8 edges of blade root

9 gap

10 overhanging small end

11 edge of blade root end surface

12 locking arm stop edge

21. 22 snap ring

23. 24 baffle

25 locking piece

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. Directional phrases used in the embodiments, such as "upper," "lower," "front," "rear," "left," "right," and the like, refer only to the orientation of the figure. Therefore, the directional terminology used is intended to be in the nature of words of description rather than of limitation.

As shown in fig. 1, in order to lock the blades by using an axial baffle or a retainer ring, a whole ring of baffles is pressed on the end face of the wheel disc by using bolts or other methods. When the locking mode is installed, bolts need to be screwed repeatedly for many times or special tools are used for operating the clamping rings 21 and 22 on the two sides so as to tightly press the whole-

circle baffle plates

23 and 24 on the end face of the wheel disc 6 to realize locking, the device needs to be arranged on the two sides of the wheel disc 6, the installation and disassembly workload is large, and the special tools are needed.

As shown in fig. 2, in the conventional method of locking the blade by using the locking piece, after the locking piece 25 and the blade 7 are installed into the wheel disc 6 along the circumferential groove, the locking piece 25 needs to be bent and permanently deformed to achieve the fixing effect.

The utility model provides a blade holder for impeller machinery is divided by locking arm 1, preceding dog 2, linkage segment 3, 4 four bibliographic categories of backstop and is constituteed. In an embodiment, as shown in fig. 3 or 5, the blade 7 is fixed to the disk 6 by an axial tongue-and-groove structure, and the blade holder for a turbo machine as shown in fig. 4 can realize the fixation of the blade 7 in the axial direction. When the blade retainer needs to be installed, the locking arm 1 is lifted up, the blade retainer is axially installed to the reserved installation position on the wheel disc 6 according to a certain angle according to the direction shown in fig. 6 or fig. 7, and the rear stop 4 can be smoothly installed in the axial direction at the angle. When the back stop 4 reaches the other side of the disk 6, the vane holder is rotated in the direction indicated by the arrow in fig. 6 to the position shown in fig. 8 or 9. The locking arm can now be released and snapped into the locking groove 5 in the end face of the root of the blade 7, whereby the blade holder is circumferentially locked.

The length of the connecting section 3 of the blade holder for the impeller machinery is the same as or very close to the thickness of the wheel disc 6, so that the front stop block 2 and the rear stop block 4 can just abut against two side walls of the wheel disc 6 to fix the blades 7 seamlessly, so that the blades are firmly kept and cannot shake during operation.

As shown in fig. 10, the edge 11 of the locking groove 5 near the end surface of the root of the blade 7 is designed to be inclined, which has the same shape as the locking arm 1, so that the locking arm 1 can be tightly clamped on the locking groove when the installation is completed, and the blade holder can be radially fixed in a cold state.

As shown in fig. 10, a suitable gap 9 can be left between the edge 8 of the locking groove 5 away from the blade root and the locking arm stop edge 12, so that the locking arm 1 can be smoothly installed into the locking groove 5, and the locking arm 1 can be prevented from being loosened from the locking groove 5 under the action of centrifugal force in an operating state. The end of the locking arm 1 is provided with an outwardly extending small end 10 which can be used as a convenient pulling means for the locking arm 1 during the mounting and dismounting stages.

The blade retainer for the impeller machinery can connect and fix the locking arm 1, the front stop block 2, the connecting section 3 and the rear stop block 4 in a welding mode, and can also be realized in a precision casting mode. The locking groove can be realized by adopting a precision casting mode and also can be realized by adopting a milling mode.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A bucket retainer for an impeller machine, comprising: the locking arm, the front stop block, the connecting section and the rear stop block are arranged on the front end face of the front stop block; the locking arm is connected with the front stop block; the front check block and the rear check block are rectangular sheets; the connecting section is cylindrical and connects the front stop block and the rear stop block together.

2. The blade retainer for an impeller machine according to claim 1, wherein the blade retainer for an impeller machine is fixed and circumferentially stopped by a locking groove of a blade root end surface.

3. The blade holder for a turbomachinery as recited in claim 1, wherein the back stop is axially fitted into the gap between the blade root and the mortise at a fitting angle perpendicular to a radial direction of the disk, and is rotated to the radial direction of the disk to restrict axial movement of the blade.

4. The vane retainer for an impeller machine according to claim 1, wherein the front stopper cooperates with the rear stopper in the mounting completion state to restrict axial movement of the vanes.

5. The vane holder for an impeller machine according to claim 1, wherein the connection section connects and fixes the lock arm, the front stopper and the rear stopper together by welding or is connected by a precision casting method.

6. The vane holder for an impeller machine according to claim 2, wherein the locking groove is formed by precision casting or milling.

7. The vane holder for an impeller of claim 1, wherein the locking arm has elasticity to fix the vane holder for an impeller in a locking position to restrict circumferential movement of the vane holder for an impeller of an impeller machine in an operation stage.

8. The vane holder for an impeller machine according to claim 1, wherein the locking arm is provided with an outwardly extending small end for mounting and dismounting.

9. The vane holder for an impeller machine according to claim 2, wherein the locking arm is provided with a stopper edge, and the stopper edge has a gap with the locking groove so that the stopper edge can be just caught in the locking groove.