Compressor blade mounting structure and compressor

Abstract

The mounting structure comprises a wheel disc, the wheel disc comprises a first groove body and a second groove body, the first groove body is used for containing axially-mounted blades, the second groove body is annularly distributed along the wheel disc and used for containing a locking assembly, and the wheel disc further comprises a third groove body; the third groove body extends downwards from the bottom of the second groove body, the locking assembly comprises an elastic assembly and a locking block, the elastic assembly is at least partially inserted into the third groove body, in the first state, the locking block is completely located in the second groove body, and the blade is installed in the first groove body; in the second state, the compression amount of the elastic assembly is smaller than that in the first state, and the locking block at least partially leaves the second groove body and abuts against the side portions of the blades in the circumferential direction of the wheel disc. According to the mounting structure, each blade corresponds to one locking assembly, the single blade does not need to be dismounted from the split locking block of the last-stage blade, the workload is reduced, the locking assemblies cannot be damaged during dismounting, repeated use is achieved, and the cost is saved.

Description

Technical Field

[0001] This invention relates to the field of gas turbines, and more specifically, to a compressor blade mounting structure and a compressor. Background Technology

[0002] Axial-flow gas turbine compressors consist of multiple rows of moving blades and multiple rows of stationary blades. The moving blades are mounted on a rotor disc. The blade root type is generally divided into dovetail root and T-shaped root. The dovetail root uses an axial mounting method, with locking strips used to axially limit and fix the blades. The installation sequence of the locking structure is as follows: first, insert the dovetail root of the moving blade into the tenon groove; then, insert the locking strip into the locking groove of the rotor disc; then, insert the next moving blade and locking strip in sequence until the last stage of moving blade is installed. When installing the last stage of moving blade, first insert two split locking blocks into the locking groove, then install the last stage of moving blade. By bending the two split locking blocks and tightening them circumferentially, the axial locking of the last stage of moving blade is achieved.

[0003] The current installation structure and method of locking strips have the following problems:

[0004] ① When removing the moving blades, it is necessary to start from the split locking block of the last moving blade and remove the adjacent blades in turn. This removal method is cumbersome and involves a large amount of work.

[0005] ② The two split locking blocks undergo plastic deformation when bent and locked, rendering them unusable and increasing costs.

[0006] Patent CN116263170A discloses a rotor disk with a circumferential through groove and non-through grooves on both sides of the blade root. When the rotor blades are installed on the rotor disk, the non-through grooves and the circumferential through grooves cooperate to form a locking groove. A vibration-damping locking mechanism is provided in the locking groove. The locking mechanism includes a damping rod and a spring. The spring is installed in the non-through groove and abuts against one end of the damping rod. The end of the damping rod away from the spring abuts against the circumferential through groove.

[0007] Patent EP1584793B1 discloses that turbine blades are inserted into an axially extending irregular groove of a turbine disk, the turbine disk having a locking groove extending radially in the plane of the turbine disk, a locking bolt being inserted into the locking groove, a notch aligned with the locking groove being provided on the lower side of the blade root, and an elastic element being arranged in the elastic element, with a prestress applied radially outward to the locking bolt in the radial direction below it.

[0008] Existing technologies offer solutions to the problems faced by current locking structures.

[0009] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0010] The main objective of this invention is to provide a compressor blade mounting structure.

[0011] To achieve the above objectives, the present invention provides a compressor blade mounting structure, including a wheel, the wheel including a first groove and a second groove, the first groove for accommodating axially mounted blades, the second groove being distributed circumferentially along the wheel for accommodating a locking assembly, the wheel also including a third groove extending downward from the bottom of the second groove, the locking assembly including an elastic component and a locking block, the elastic component being at least partially inserted into the third groove, in a first state, the locking block being completely located inside the second groove, and the blade being mounted in the first groove; in a second state, the compression of the elastic component is less than the compression in the first state, the locking block is at least partially removed from the second groove, and abuts against the side of the blade along the circumference of the wheel.

[0012] Preferably, the elastic component includes a spring and a sleeve, with the spring at least partially located inside the sleeve.

[0013] Preferably, the sleeve has a closed end face near the locking block.

[0014] Preferably, the blade has a notch, and the locking block includes a first locking part, in the second state, the first locking part is at least partially located in the notch.

[0015] Preferably, the bottom of the locking block is provided with a fourth groove, and the part of the elastic component near the closed end face can slide in the fourth groove.

[0016] Preferably, the third groove extends at a certain angle to the radial direction of the wheel, with the angle ranging from 15 to 60°.

[0017] Preferably, the locking block has a top surface on the side opposite to the bottom, and the top surface and the bottom are inclined at a certain angle, the angle range being 15 to 60°.

[0018] Preferably, the third groove extends radially along the wheel.

[0019] Preferably, the locking block includes a boss, and in the second state, one end of the boss near the blade is on the outside of the second groove, abutting against the blade.

[0020] Preferably, in the second state, the top outer surface of the lock block is in the same plane as the wheel.

[0021] Preferably, the boss is a T-shaped platform.

[0022] Preferably, the second groove is a dovetail groove or a T-shaped groove.

[0023] Preferably, the dimension of the locking block in the radial direction of the wheel is smaller than the depth of the second groove.

[0024] In addition, this application also proposes a compressor including multiple stages of blades, each stage of blades having the aforementioned blade mounting structure.

[0025] The compressor blade mounting structure and compressor proposed in this invention achieve the following technical effects:

[0026] 1. Each blade corresponds to a locking assembly. For the removal of a single blade, it is not necessary to start from the split locking block of the last stage moving blade, which reduces the workload.

[0027] 2. The locking components will not be damaged when removed, and can be reused, saving costs;

[0028] 3. When the locking assembly is in the locked state, the outer surface of the locking block is parallel to the internal flow channel of the compressor, without grooves, and will not affect the internal flow field of the compressor. Attached Figure Description

[0029] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This application shows the main view of the sleeve.

[0031] Figure 2 The cross-sectional view of the sleeve used in this application is shown;

[0032] Figure 3 A schematic diagram of the spring structure used in this application is shown;

[0033] Figure 4 A schematic diagram of the notch structure on the blade of this application is shown;

[0034] Figure 5 A schematic diagram of the locking block and the fourth groove structure on it is shown in this application;

[0035] Figure 6 This application shows a schematic diagram of the cross-sections of the second and third grooves on the roulette wheel;

[0036] Figure 7 A perspective view of the lock block structure in the first embodiment of this application is shown;

[0037] Figure 8 A side view of the lock block structure in the first embodiment of this application is shown;

[0038] Figure 9 A top view of the lock block structure in the first embodiment of this application is shown;

[0039] Figure 10 A top view of the lock block structure in the first embodiment of this application is shown;

[0040] Figure 11 A schematic diagram of the notch structure on the blade in the first embodiment of this application is shown;

[0041] Figure 12 A side view of the second groove on the wheel according to the first embodiment of this application is shown;

[0042] Figure 13 A cross-sectional view of the lock block according to the first embodiment of this application is shown;

[0043] Figure 14 A top view of the lock block according to the first embodiment of this application is shown;

[0044] Figure 15 A schematic diagram of the structure in the locked state of the first embodiment of this application is shown;

[0045] Figure 16 A cross-sectional view of the first embodiment of this application in the locked state is shown;

[0046] Figure 17 A schematic diagram of the lock block structure in the second embodiment of this application is shown;

[0047] Figure 18 A three-dimensional structural diagram of the second tank body according to the second embodiment of this application is shown;

[0048] Figure 19 A side view of the second tank body according to a second embodiment of this application is shown;

[0049] Figure 20 A side view of the second tank body according to a second embodiment of this application is shown;

[0050] Figure 21 This invention provides a second embodiment of the present application, showing a schematic diagram of the position of the locking block in the second groove and the locking block.

[0051] Figure 22 A schematic diagram of the locking state structure according to the second embodiment of this application is shown;

[0052] Figure 23 A cross-sectional view of the locked state structure according to the second embodiment of this application is shown.

[0053] The above figures include the following reference numerals:

[0054] 100. Wheel; 140. Second groove; 300. Blade; 160. Third groove; 220. Elastic component; 240. Locking block; 222. Spring; 224. Sleeve; 2242. Closed end face; 320. Notch; 242. Fourth groove; 243. Boss; 244. Leftmost end of the inclined side of the locking block; 101. Side of the second groove; 2431. First groove; 247. Bottom platform; 2471. Upper surface of the bottom platform; 142. Second groove; 241. Force-bearing surface of the locking block; 245. Inclined surface of the locking block; 246. Top surface; 321. Inclined side of the blade notch; 322. Force-bearing surface of the blade notch; 248. First inclined side; 249. Second inclined side; 144. Inclined side of the second groove. Detailed Implementation

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0058] This application proposes a compressor blade mounting structure in which each blade is independently equipped with a locking component, which enables the removal of individual blades. Compared with the prior art, this reduces the workload of disassembly and assembly. In addition, the locking component does not deform during disassembly and assembly and can be reused after removal, thus reducing costs.

[0059] Specifically, the blade mounting structure includes a wheel 100, which includes a first groove and a second groove 140. The first groove is used to accommodate the axially mounted blade 300, and the second groove 140 is distributed circumferentially along the wheel 100 to accommodate locking components. One locking component corresponds to one blade, and the individual blade can be removed through the locking components, which reduces the difficulty and workload of disassembly and assembly compared to the existing technology.

[0060] To facilitate the installation and removal of the locking assembly, the wheel 100 is further provided with a third groove 160, which extends downward from the bottom of the second groove 140. The locking assembly includes an elastic component 220 and a locking block 240, with the elastic component 220 at least partially inserted into the third groove 160. In the first state, the locking block 240 is completely located in the second groove 140, enabling the blade to be installed into the first groove. In the second state, the compression of the elastic component 220 is less than that in the first state, and the locking block 240 is at least partially removed from the second groove 140, abutting against the side of the blade along the circumference of the wheel. The first state is the initial installation state, in which the blade is installed into the first groove. The second state is the locking state, in which the blade is locked by the locking assembly, restricting the movement of the blade in the first groove. To enable the switching of the locking block's position without hindering the installation of the blade, this application requires that the radial dimension of the locking block 240 on the wheel 100 be less than the depth of the second groove 140.

[0061] Specifically, combined Figures 1-3 As shown, the elastic component 220 includes a spring 222 and a sleeve 224, with the spring 222 at least partially located inside the sleeve 224. The sleeve 224 has a closed end face 2242 near the locking block. In the installed state, the closed end face contacts the bottom of the locking block 240, and the locking block changes position under the elastic action of the spring.

[0062] To achieve locking of the lock block, such as Figure 4 As shown, the blade 300 should also have a notch 320, and the locking block 240 has a first locking part. In the second state, the first locking part is at least partially located in the notch 320, and the other part of the locking block 240 is located in the second groove 140, restricting the movement of the locking block on the wheel.

[0063] To ensure the stability of the interaction between the elastic component and the locking block, and to limit the position of the elastic component in the locked state, such as... Figure 5As shown, in this application, a fourth groove 242 is provided at the bottom of the locking block 240, and the portion of the elastic component 220 near the closed end face 2242 can slide within the fourth groove 242. Preferably, the fourth groove 242 extends along the circumferential direction of the wheel 100 and is closed at one end. In the locked state, the portion of the elastic component 220 near the closed end face 2242 abuts against the closed end of the fourth groove. To ensure the stability of the lock, preferably, the side of the closed end of the fourth groove 242 is cylindrical, and in the locked state, the center line of the side of the closed end of the fourth groove 242 coincides with the center line of the third groove 160.

[0064] This application does not impose specific limitations on the structure of the third groove, the fourth groove, and the sleeve, as long as their structures are compatible. The fourth groove can be rectangular, semi-circular, semi-elliptical, trapezoidal, or triangular, etc. If the structure of the fourth groove changes, only the closed end face of the sleeve needs to be changed accordingly to a plane, semi-circular, semi-elliptical, trapezoidal, or triangular shape to achieve the fit between the sleeve groove and the sleeve. The third groove on the wheel can be circular, square, or triangular. If the structure of the third groove changes, only the outer surface of the sleeve needs to be changed accordingly to a circular, square, or triangular shape to achieve the fit between the third groove and the sleeve.

[0065] This application proposes two different solutions based on differences in the structure and installation method of the third groove, locking block, elastic component, and second groove. The following detailed embodiments further illustrate these two structural types.

[0066] Example 1

[0067] like Figure 6 As shown, in this embodiment, the third groove 160 extends at a certain angle to the radial direction of the wheel 100, with the angle ranging from 15 to 60°. The elastic component is located in the third groove, so that the direction of the elastic force of the elastic component forms a certain angle with the radial direction of the wheel. In this way, the locking block moves at a certain angle under the elastic force, so that one end of the locking block leaves the second groove 140 and locks with the blade that has been installed in the first groove. The locking block and the sleeve are locked under the dual action of the spring and centrifugal force.

[0068] In this embodiment, the locking block structure is as follows: Figures 7-10As shown, the locking block 240 has a convex cross-section. A top surface 246 is provided on the side of the locking block 240 opposite to its bottom, with the top surface and bottom forming a certain angle, ranging from 15° to 60°. During the transition from the first state to the second state, the locking block 240 slides along the inclined surface 245. In the second locked state, under the action of centrifugal force, the inclined surface 245 of the locking block tightly engages with the inclined surface of the wheel, achieving better locking. Furthermore, during disassembly, the locking block needs to return to the first state along the inclined surface 245 to separate the locking block from the blade. In addition, to avoid the locking block affecting the internal flow field, this application optimizes the outer surface contour and structure of the locking block, making the locking block flow channel parallel to the compressor's internal flow channel.

[0069] The notch 320 structure on the blade that mates with it is as follows Figures 11-13 As shown, the inclined side 144 of the second groove is parallel to the inclined side 321 of the blade notch and the first inclined side 248 and the second inclined side 249 of the locking block 240.

[0070] The specific installation steps of this blade mounting structure are as follows: Step 1: Install the spring into the third groove 160 on the wheel; Step 2: Install the sleeve 224 into the third groove 160 with the opening facing downwards, ensuring the upper surface of the sleeve 224 is horizontal, achieving cooperation with the third groove on the wheel, the spring, and the sleeve; Step 3: Press the sleeve down along the inclined direction of the third groove, with the side of the sleeve engaging with the side of the third groove, and insert the locking block into the second groove on the wheel. At this time, the upper surface of the sleeve contacts and engages with the upper surface of the fourth groove on the locking block. Figure 14 As shown, the force-bearing surface of the locking block contacts and engages with the force-bearing surface of the second groove, pushing the locking block so that the first inclined side 248 of the locking block contacts and engages with the inclined side 144 of the second groove, and ensuring that the leftmost end 244 of the inclined side of the locking block and the side 101 of the second groove are on the same plane.

[0071] Step 4: Insert the blade into the first groove, release the locking block, and the locking block and sleeve will lock together under the spring force, as shown in the locked state. Figures 15-16 As shown, at this time, the second inclined side 249 of the locking block is in contact with the inclined side 321 of the blade notch, and the force-bearing surface 241 of the locking block is in contact with the force-bearing surface of the blade notch.

[0072] Example 2

[0073] Unlike the installation structure in Embodiment 1, in this embodiment, the third groove 160 extends radially along the wheel 100. The elastic component is inserted into the third groove, and the force exerted on the locking block is also radially along the wheel.

[0074] In this embodiment, the locking block 240 includes a boss 243, which is a T-shaped platform. When the blade is installed into the first groove, the locking block is pushed circumferentially so that one end of the boss 243 near the blade 300 is on the outside of the second groove 140, abutting against the blade 300. In addition, in the second state, the top outer surface of the locking block 240 is located in the same plane as the wheel 100 to avoid flow channel loss.

[0075] Combination Figures 18-20 As shown, the second groove 140 is a dovetail groove or a T-shaped groove, and the second groove 140 is also provided with a second recess 142. The upper surface of the boss of the locking block 240 contacts and engages with the second recess 142. In the second state, the upper surface 2471 of the bottom platform of the locking block abuts against the second groove 140.

[0076] To facilitate the circumferential movement of the locking block, such as Figure 17 As shown, the locking block also has a first groove 2431 on the boss. By inserting a tool into the first groove 2431 of the locking block.

[0077] The installation method of the mounting structure in this embodiment is basically the same as that in embodiment 1. The main difference is that after the locking block 240 is released, the locking block 240 is moved along the circumferential direction of the wheel to lock the locking block and the blade.

[0078] The specific installation steps of the mounting structure in this embodiment are as follows: Step 1: Insert the spring into the third groove of the wheel; Step 2: Insert the sleeve into the third groove of the wheel with the opening facing downwards; Step 3: Press the spring sleeve along the third groove of the wheel, insert the locking block into the second groove of the wheel, at this time the upper surface of the sleeve contacts and engages with the upper surface of the fourth groove of the locking block, the upper surface of the T-shaped protrusion of the locking block contacts and engages with the groove of the second groove and the upper surface of the second groove, push the locking block, after assembly as follows. Figure 21 As shown.

[0079] Step 4: Insert the blade into the first groove, insert the tool into the first groove 2431 of the locking block, and push the locking block towards the adjacent blade. Under the action of the spring, the surface of the locking block engages with the upper surface of the second groove, thus locking the device. Figures 22-23 As shown. When the gas turbine is running, the locking block and sleeve are locked together by the combined action of the spring and centrifugal force.

[0080] Disassembly steps: Press down the locking block, insert the tool into the second groove in the locking block, push the locking block towards the second groove, push the locking block until it is fully inserted into the second groove, and remove the blade.

[0081] In summary, the compressor blade mounting structure proposed in this embodiment achieves the following technical effects:

[0082] 1. Each blade corresponds to a locking assembly. For the removal of a single blade, it is not necessary to start from the split locking block of the last stage moving blade, which reduces the workload.

[0083] 2. The locking components will not be damaged when removed, and can be reused, saving costs;

[0084] 3. When the locking assembly is in the locked state, the outer surface of the locking block is parallel to the internal flow channel of the compressor, without grooves, and will not affect the internal flow field of the compressor.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compressor blade mounting structure, comprising a wheel (100), the wheel (100) including a first groove and a second groove (140), the first groove for accommodating axially mounted blades (300), and the second groove (140) being circumferentially distributed along the wheel (100) for accommodating locking components. Its features are, The wheel (100) also includes a third groove (160) that extends downward from the bottom of the second groove (140). The locking assembly includes an elastic component (220) and a locking block (240). The elastic component (220) is at least partially inserted into the third groove (160). In a first state, the locking block (240) is completely located inside the second groove (140), and the blade is installed in the first groove. In a second state, the compression of the elastic component (220) is less than the compression in the first state, and the locking block (240) is at least partially removed from the second groove (140) and abuts against the side of the blade along the circumference of the wheel.

2. The compressor blade mounting structure according to claim 1, characterized in that, The elastic component (220) includes a spring (222) and a sleeve (224), with the spring (222) located at least partially inside the sleeve (224).

3. The compressor blade mounting structure according to claim 2, characterized in that, The sleeve (224) has a closed end face (2242) near the end of the locking block.

4. The compressor blade mounting structure according to claim 3, characterized in that, The blade (300) has a notch (320), and the locking block (240) includes a first locking part, which is at least partially located in the notch (320) in a second state.

5. The compressor blade mounting structure according to claim 4, characterized in that, The bottom of the locking block (240) is provided with a fourth groove (242), and the portion of the elastic component 220 near the closed end face (2242) can slide within the fourth groove (242).

6. The compressor blade mounting structure according to claim 5, characterized in that, The third groove (160) extends at a certain angle to the radial direction of the wheel (100), with the angle ranging from 15 to 60°.

7. The compressor blade mounting structure according to claim 6, characterized in that, The locking block (240) has a top surface on the side opposite to the bottom, and the top surface is inclined at a certain angle to the bottom, with the inclination angle ranging from 15 to 60°.

8. The compressor blade mounting structure according to claim 5, characterized in that, The third groove (160) extends radially along the disk (100).

9. The compressor blade mounting structure according to claim 8, characterized in that, The locking block (240) includes a boss (243). In the second state, one end of the boss (243) near the blade (300) is on the outside of the second groove (140) and abuts against the blade (300).

10. The compressor blade mounting structure according to claim 9, characterized in that, In the second state, the top outer surface of the lock block (240) and the wheel (100) are located in the same plane.

11. The compressor blade mounting structure according to claim 10, characterized in that, The boss (243) is a T-shaped platform.

12. The compressor blade mounting structure according to any one of claims 1-5, characterized in that, The second groove (140) is a dovetail groove or a T-shaped groove.

13. The compressor blade mounting structure according to any one of claims 1-5, characterized in that, The dimension of the locking block (240) in the radial direction of the wheel (100) is smaller than the depth of the second groove (140).

14. A compressor comprising multiple stages of blades, each stage of blades having a corresponding blade mounting structure as described in any one of claims 1-13.

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