A blade holder for impeller machinery

Abstract

The present invention provides a blade holder for turbomachinery, which can be used to hold the rotor blades of turbomachinery such as gas turbines and aircraft engines in the axial grooves of the rotor wheel disc, and is composed of a locking arm, a front stopper, a connecting section, and a rear stopper, which fixes the blades axially, and a locking groove is arranged on the end surface of the blade root to stop the blade holder for turbomachinery radially and circumferentially. Any blade can be replaced individually without opening a hole on the wheel disc.

Description

Technical Field

[0001] The invention belongs to the technical field of impeller machine blade holder structure design, and in particular relates to a blade holder used for an impeller machine. Background Art

[0002] In turbomachinery equipment such as aircraft engines and gas turbines, the rotor rotates at high speed, and the running rotor blades generate large centrifugal forces. The method of machining axial grooves on the impeller to fix the blades in the radial and circumferential directions is a widely verified structural form. When using this structure, designers need to solve the problem of axial locking of the blades.

[0003] In general, the current axial locking methods of blades can be divided into two categories. One is to use an axial baffle or a baffle ring; the other is to use a locking plate. The axial baffle is mostly pressed against the end face of the disc by bolts or other means to tighten the entire circle of baffles onto the disc end face. This locking method requires repeated tightening of the bolts or the use of special tooling to operate structures such as retaining rings to achieve locking during installation. The disadvantage is that the installation and disassembly workload is large and requires special tooling. At the same time, this locking method often requires this device to be installed on both sides of the disc, further increasing the overall complexity. In terms of locking plates, previous locking devices usually require the use of two parts in conjunction or require the locking device to undergo permanent plastic deformation during the installation phase, resulting in a large amount of installation and disassembly workload. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The present invention provides a blade holder for an impeller machine, which has a small installation and disassembly workload, can conveniently disassemble a single blade, and does not require plastic deformation of parts during the installation stage.

[0006] (II) Technical solution

[0007] The present invention provides a blade retainer for an impeller machine, which consists of four parts: a locking arm, a front stopper, a connecting section, and a rear stopper. The locking arm has a spoon-shaped bend and is vertically connected to the center of one side of the front stopper. The front stopper and the rear stopper are both rectangular thin sheets, and the connecting section connects the front stopper and the rear stopper together. Fixing and circumferential stopping are achieved by using a locking groove on the end face of the root of the blade. The locking groove can be achieved by precision casting, and preferably, it can also be achieved by milling.

[0008] The rear stopper can be smoothly installed in the gap between the blade root and the tenon groove along the axial direction at an installation angle perpendicular to the radial direction of the wheel disc, and can limit the axial movement of the blade by rotating to the radial direction of the wheel disc.

[0009] The front stopper cooperates with the rear stopper in the installed state to limit the axial movement of the blade.

[0010] The locking arm has appropriate elasticity and can utilize elastic deformation to reduce the difficulty of assembly during the installation stage, so that it can be just stuck in the locking groove to fix the blade retainer in the locking position, and the circumferential movement of the blade retainer of the impeller machinery can be limited during the operation stage.

[0011] The locking arm is provided with a small outward end for installation and disassembly, and the small outward end can be used during the installation and disassembly stages to simplify the operation of installing and disassembling the blade retainer of the impeller machinery.

[0012] The locking arm is provided with a stop edge, and a gap is provided between the stop edge and the locking groove, so that the stop edge can be just inserted into the locking groove, thereby preventing the locking arm from being disengaged from the locking groove under the action of centrifugal force in the working state.

[0013] The connection section connects and fixes the locking arm, the front block and the rear block together by welding. Preferably, the connection can also be achieved by precision casting.

[0014] (III) Beneficial effects

[0015] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0016] (1) No need to drill holes in the wheel disc, and no other auxiliary mechanism is required for fixing;

[0017] (2) There is no need to plastically deform the locking device during the installation phase;

[0018] (3) No special tooling equipment is required for installation and disassembly;

[0019] (4) Individual blades can be easily disassembled and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the axial baffle structure;

[0021] Figure 2 It is a schematic diagram of a conventional locking structure;

[0022] Figure 3 It is a schematic diagram of the axial tenon-groove structure;

[0023] Figure 4 It is a schematic diagram of the structure of the blade retainer of the present invention;

[0024] Figure 5 It is a schematic diagram of the locking groove of the present invention;

[0025] Figure 6 This is a schematic diagram of the front baffle side where the blade retainer of the present invention is installed;

[0026] Figure 7This is a schematic diagram of the rear baffle side view where the blade retainer of the present invention is installed;

[0027] Figure 8 A schematic diagram of the side view of the front baffle after the blade retainer of the present invention is installed;

[0028] Fig. 9 A schematic diagram of the side position of the rear baffle after the blade retainer of the present invention is installed;

[0029] Fig.10 Detailed view of the locking piece and locking groove of the invented blade retainer.

[0030] Explanation of symbols

[0031] 1 Locking arm

[0032] 2 Front stopper

[0033] 3 Connection segment

[0034] 4 Rear stopper

[0035] 5 Locking slot

[0036] 6 Roulette

[0037] 7 blades

[0038] 8 Edge of blade root

[0039] 9 Gap

[0040] 10 Extended small end

[0041] 11 Edge of blade root end face

[0042] 12 Locking arm stop edge

[0043] 21, 22 Snap ring

[0044] 23, 24 Baffle

[0045] 25 Locking plate DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that in the drawings or descriptions, similar or identical parts all use the same figure numbers. The implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, although demonstrations of parameters containing specific values ​​may be provided herein, it should be understood that the parameters do not need to be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within an acceptable error tolerance or design constraint. The directional terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the scope of protection of the present invention.

[0047] like Figure 1 As shown, the blades are currently locked by means of axial baffles or baffle rings, and the entire circle of baffles is pressed against the end face of the wheel disc by bolts or other means. This locking method requires repeated tightening of the bolts or the use of special tooling to operate the clamping rings 21 and 22 on both sides during installation to press the entire circle of baffles 23 and 24 against the end face of the wheel disc 6 to achieve locking. This device needs to be installed on both sides of the wheel disc 6, and the installation and disassembly workload is large, and special tooling is required.

[0048] like Figure 2 The figure shows the current method of locking the blades with locking plates. After the locking plates 25 and the blades 7 are simultaneously installed into the wheel disc 6 along the circumferential groove, the locking plates 25 need to be punched and bent to be permanently deformed to achieve a fixing effect.

[0049] The present invention provides a blade retainer for an impeller machine, which is composed of a locking arm 1, a front stopper 2, a connecting section 3, and a rear stopper 4. In one embodiment, Figure 3 or Figure 5 As shown, the blade 7 is fixed to the wheel disc 6 through an axial tongue and groove structure. Figure 4 The blade holder for the impeller machine shown can fix the blade 7 in the axial direction. When the blade holder needs to be installed, first lift the locking arm 1, and then Figure 6 or Figure 7 The blade holder is installed axially into the reserved installation position on the wheel disc 6 at a certain angle. At this time, the rear block 4 is at an angle that can be smoothly installed axially. When the rear block 4 reaches the other side of the wheel disc 6, Figure 6 Rotate the blade holder in the direction indicated by the arrow to achieve the following Figure 8 or Fig. 9 The locking arm can be loosened to fit into the locking groove 5 at the root end face of the blade 7, thereby achieving the circumferential stop of the blade retainer.

[0050] The length of the connecting section 3 of the blade retainer for the impeller machine is the same as or very close to the thickness of the wheel disc 6, so that the front stopper 2 and the rear stopper 4 can just abut against the two side walls of the wheel disc 6 to seamlessly fix the blade 7 so that it remains firm and does not shake during operation.

[0051] The locking groove 5 is as follows Fig.10 As shown, the edge 11 of the locking groove 5 close to the root end face of the blade 7 is designed to be inclined in the same shape as the locking arm 1, so that the locking arm 1 can be tightly clamped thereon when installed, and the blade retainer can be radially fixed in a cold state.

[0052] like Fig.10 As shown, an appropriate gap 9 can be left between the edge 8 of the locking groove 5 away from the root of the blade and the locking arm stop edge 12, which can not only allow the locking arm 1 to be smoothly installed in the locking groove 5, but also prevent the locking arm 1 from being loosened from the locking groove 5 due to the centrifugal force in the 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 device for the locking arm 1 during the installation and removal stages.

[0053] The blade holder for the impeller machine can be connected and fixed by welding the locking arm 1, the front block 2, the connecting section 3, and the rear block 4, or by precision casting. The locking groove can be realized by precision casting or by milling.

[0054] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blade holder for an impeller machine, characterized in that: The blade holder for the impeller machine comprises: a locking arm, a front block, a connecting section, and a rear block; the locking arm is connected to the front block; the front block and the rear block are both rectangular thin sheets; the connecting section is cylindrical, connecting the front block and the rear block together; the blade holder for the impeller machine is fixed and circumferentially stopped by a locking groove on the end surface of the blade root; The rear stopper can be installed in the gap between the blade root and the tenon groove along the axial direction at an installation angle perpendicular to the radial direction of the wheel disc, and can be rotated to the radial direction of the wheel disc to limit the axial movement of the blade; The edge of the locking groove close to the end surface of the blade root is designed to be inclined in the same shape as the locking arm, so that the locking arm can be tightly clamped thereon when the installation is completed, and the blade holder can be radially fixed in a cold state. The installation and disassembly of the blade holder does not require the use of special tooling equipment; The locking arm is elastic and fixes the blade holder for the impeller machinery in a locking position, and can limit the circumferential movement of the blade holder for the impeller machinery during the operation stage. The locking arm is provided with a small outward extension end for installation and disassembly.

2. The blade holder for a turbomachinery according to claim 1, characterized in that: The front stopper cooperates with the rear stopper in the installed state to limit the axial movement of the blade.

3. The blade holder for a turbomachinery according to claim 1, characterized in that: The connection section connects and fixes the locking arm, the front block and the rear block together by welding, or by precision casting.

4. The blade holder for a turbomachinery according to claim 1, characterized in that: The locking groove is realized by precision casting or milling.

5. The blade holder for a turbomachinery according to claim 1, characterized in that: The locking arm is provided with a stop edge, and there is a gap between the stop edge and the locking groove, so that the stop edge can be just inserted into the locking groove.

Images