Axial locking assembly and compressor including the same

Abstract

The present invention provides an axial locking assembly for a compressor blade. The blade root of a blade (2) is mounted in a wheel disc (3). The locking assembly comprises a first mounting portion (21), a second mounting portion (31), and a locking body (1). The first mounting portion (21) is arranged on the blade root, and the second mounting portion (31) is arranged on the wheel disc. The locking body can be at least partially accommodated in an accommodating cavity formed by the first mounting portion (21) and the second mounting portion (31) to limit the relative displacement of the blade root and the wheel disc (3) in the axial direction. The locking body (1) is an integrated elastic structure. The locking body (1) uses only one type of parts to achieve locking of the entire impeller, and is relatively easy to unlock without requiring special tooling or process requirements.

Description

Technical Field

[0001] The present invention relates to a gas turbine, and in particular to an axial locking assembly. Background Art

[0002] In the locking structure of the compressor blades of a gas turbine, the locking strip is installed in a groove inside the wheel disc. The locking device structure in the existing technical solution is complex, and the unlocking is also relatively complicated. For example, the locking structure disclosed in patent CN113623270A is arranged in a low-stress area on the blade root and the wheel disc where stress is relatively low, and includes a first mounting portion, a second mounting portion, and an interlocking device. The interlocking device includes a first sliding portion, a second sliding portion, and an elastic portion. The first sliding portion and the second sliding portion are arranged at both ends of the elastic portion, and the interlocking device is operable between a locked position and an open position. In the locked position, the interlocking device cooperates with the first mounting structure and the second mounting structure to limit the axial displacement of the blade. This patent realizes axial locking of the blade root and the wheel disc, but the locking structure has many parts and is complicated to install and disassemble.

[0003] In view of the above problems, the present invention provides a solution. Summary of the Invention

[0004] The main purpose of the present invention is to provide an integrated locking structure to solve the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a compressor blade axial locking assembly is provided, wherein the blade root of the blade is installed in the wheel disc, and the locking assembly includes a first mounting portion, a second mounting portion, and a locking body. The first mounting portion is arranged on the blade root, and the second mounting portion is arranged on the wheel disc. The locking body can be at least partially accommodated in the accommodating cavity formed by the first mounting portion and the second mounting portion to limit the relative displacement of the blade root and the wheel disc in the axial direction. The locking body is an integrated elastic structure. The locking body is an integrated elastic structure. Through this one part, the axial locking of the blade and the wheel disc can be achieved. When disassembling and assembling, there is no need to destroy the locking structure, and the locking structure can be reused. In addition, the locking body is an elastic structure, which has low requirements for the processing technology.

[0006] Furthermore, the locking body includes a locked state and an unlocked state. In the locked state, the locking body is at least partially accommodated in the accommodating cavity through elastic deformation, pressing against the blade root or the wheel disc to lock it. In the unlocked state, the locking body is at least partially disengaged from the accommodating cavity, releasing the relative displacement restriction in the axial direction of the blade root and the wheel disc.

[0007] Furthermore, the unlocked state can be achieved through unlocking operations in two directions.

[0008] Furthermore, the two directions are operating the locking body to lift it upward to unlock and operating the locking body to press it downward to unlock.

[0009] Furthermore, the locking body is arc-shaped and includes a limiting portion and an elastic locking portion. The elastic locking portion is arranged at one end of the limiting portion. In the locked state, the limiting portion is accommodated in the second mounting portion, and the elastic locking portion is accommodated in the second mounting portion and extends to the first mounting portion.

[0010] Furthermore, the locking body further includes a positioning portion, which is located at the other end of the limiting portion. The positioning portion includes an end bevel, which abuts against the side surface of the blade root.

[0011] Furthermore, the locking body extends in a long strip shape and includes a limiting portion and two elastic locking portions, and the two elastic locking portions are arranged at both ends of the limiting portion.

[0012] Furthermore, the elastic locking portion is an elastically deformable structure.

[0013] Furthermore, the elastic locking portion is provided with a plurality of cutout grooves on two opposite sides of the blade root in the radial direction, and the plurality of cutout grooves on one side and the plurality of cutout grooves on the other side are staggered to form a meandering groove structure, so that the elastic locking portion can be elastically deformed.

[0014] Furthermore, in the locked state, the position of the elastic locking portion in the radial direction of the blade root is higher than the position of the limiting portion, so that the elastic locking portion can be elastically deformed downward to disengage from the second mounting portion, thereby achieving an unlocked state between the blade root and the wheel disc.

[0015] Furthermore, the elastic locking portion includes a process hole, and the elastic locking portion is lifted upward through the process hole to disengage from the first mounting portion, thereby achieving an unlocked state between the blade root and the wheel disc.

[0016] Furthermore, the first mounting portion is a first groove capable of accommodating the elastic locking portion, and the second mounting portion is a second groove capable of accommodating the limiting portion.

[0017] Furthermore, the cross section of the limiting portion is trapezoidal or T-shaped to prevent the locking body from being disengaged from the second groove.

[0018] Furthermore, the cross section of the second groove is trapezoidal or T-shaped.

[0019] Furthermore, the locking body is made of titanium alloy.

[0020] To achieve the above objectives, according to one aspect of the present invention, a compressor is provided, comprising blades and a disk, wherein the blade roots are mounted within the disk. The compressor further comprises any of the aforementioned axial locking assemblies. The compressor including the axial locking assembly is quick to install and easy to disassemble, thereby improving the efficiency of compressor installation and maintenance, and eliminating the need for special tooling and process requirements.

[0021] By applying the technical solution of the present invention, the locking body can lock the entire impeller using only one type of parts, effectively reducing the types of part specifications. The locking body is designed as an elastic structure to achieve unlocking in two directions without destroying the parts, and the locking body can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 shows an axonometric view of the integrated locking body structure according to the present invention; and

[0024] Figure 2 Shown Figure 1 Left view of;

[0025] Figure 3 A schematic structural diagram of a wheel disc with a second mounting portion according to the present invention is shown;

[0026] Figure 4 A schematic diagram of a blade structure with a first mounting portion according to the present invention is shown;

[0027] Figure 5 It shows a top view of the elastic locking assembly in a normal locking state according to the present invention;

[0028] Figure 6 It shows a cross-sectional view of the elastic locking assembly in a normal locking state according to the present invention;

[0029] Figure 7 It shows a schematic structural diagram of the elastic locking assembly in the downward unlocked state according to the present invention;

[0030] Figure 8 A schematic structural diagram of the elastic locking assembly according to the present invention in an upward unlocked state is shown.

[0031] The above drawings include the following reference numerals:

[0032] 1. Locking body; 11. Elastic locking part; 12. Process hole; 13. Limiting part;

[0033] 2. Blade; 21. First mounting portion; 3. Disc; 31. Second mounting portion. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The present invention is described in further 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 "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention; in addition, the terms "first", "second", etc. are used to distinguish different objects, rather than to describe a specific order.

[0036] In this description, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] After gas turbine compressor blades 2 are installed in the grooves of the impeller 3, they still need to be positioned axially. The present invention provides an integrated axial locking structure for compressor blades 2 to achieve rapid axial locking of the blades 2 and the impeller 3. The locking assembly of the present invention achieves individual axial locking of each blade 2 and the impeller 3.

[0038] like Figure 1-Figure 5 As shown, the locking assembly includes a first mounting portion 21, a second mounting portion 31, and a locking body 1. The first mounting portion 21 is arranged on the blade root, and the second mounting portion 31 is arranged on the wheel disc 3. The locking body 1 can be at least partially accommodated in the accommodating cavity formed by the first mounting portion 21 and the second mounting portion 31, and the relative displacement of the blade root and the wheel disc 3 in the axial direction is limited by limiting the axial freedom of the first mounting portion 21 and the second mounting portion 31. Among them, the locking body 1 is an integrated elastic structure. Through this one part, the axial locking of the blade 2 and the wheel disc 3 can be achieved. When disassembling and assembling, there is no need to destroy the locking structure, and the locking structure can be reused. In addition, the locking body 1 is an elastic structure, which has low requirements for processing technology.

[0039] The material of the locking body 1 can be titanium alloy, which meets the requirements of high temperature resistance and high strength. Figure 5As shown, the locking body 1 is an integrated elastic structure mounted on the wheel disc 3. It is arc-shaped and includes a stopper 13 and an elastic locking portion 11. The stopper 13 has a trapezoidal or T-shaped cross-section to prevent the locking body 1 from disengaging from the second mounting portion 31, thereby ensuring radial positioning of the locking body 1 within the second mounting portion 31. In the locked state, the stopper 13 is accommodated within the second mounting portion 31.

[0040] The elastic locking portion 11 is disposed at one end of the limiting portion 13 and is an elastically deformable structure. It is accommodated within the second mounting portion 31 and extends to the first mounting portion 21. The elastic locking portion 11 has multiple slots formed on two opposing sides in the radial direction of the blade root. The multiple slots on one side and the multiple slots on the other side are staggered to form a zigzag groove structure, allowing the elastic locking portion 11 to deform elastically.

[0041] The elastic locking portion 11 can be processed by wire-cutting grooves using electric spark discharge machining. The groove depth, width, and pitch affect the bending effect of the lock bar. Generally, the groove depth of the meandering groove structure is approximately 0.75 of the thickness of the elastic locking portion 11, the groove width is 0.2-0.3 mm, and the pitch is 0.8-1 of the groove depth value. When selecting the above parameters, strength verification is required. Corresponding to the elastic locking portion 11, other forms of elastic structures can also be used, such as integrated leaf springs, plate springs, and bellows.

[0042] The elastic locking portion 11 also includes a process hole 12. The elastic locking portion 11 is lifted upward through the process hole 12 to disengage from the first mounting portion 21, thereby unlocking the blade root from the wheel disc 3. The process hole 12 can be configured as a threaded hole, etc., and the elastic locking portion 11 can be lifted upward by screwing in a tool such as a screw.

[0043] The locking body 1 further includes a positioning portion, which is located at the other end of the limiting portion 13 . The positioning portion includes an end bevel, which abuts against the side surface of the blade root.

[0044] The first mounting portion 21, which mates with the locking body 1, is a first groove capable of accommodating the elastic locking portion 11. The first groove can be rectangular or have other slotted shapes, such as a triangle. The second mounting portion 31 is a second groove capable of accommodating the stopper 13, and its cross-section is trapezoidal, T-shaped, or dovetail-shaped. The locking body 1 mates with the second groove of the wheel disc 3, effectively restricting radial movement of the locking body 1.

[0045] During installation, the locking body 1 is inserted into the second groove on the wheel disc 3 , and the elastic locking portion 11 extends into the first groove or disengages from the first groove to achieve a locked state and an unlocked state of the locking body 1 .

[0046] like Figure 6As shown, in the locked state, the locking body 1 is at least partially accommodated in the accommodating cavity by elastic deformation, pressing against the blade root or the wheel disc 3 for locking. The position of the elastic locking portion 11 in the radial direction of the blade root is higher than the position of the limiting portion 13, providing space for the elastic locking portion 11 to elastically deform downward, so that the elastic locking portion 11 can elastically deform downward to disengage from the second groove, thereby realizing the unlocked state of the blade root and the wheel disc 3.

[0047] In the unlocked state, the locking body 1 is at least partially removed from the accommodating cavity, releasing the relative displacement restriction of the blade root and the wheel disc 3 in the axial direction. Figure 7-Figure 8 As shown, the locking assembly is easy to unlock, does not require special tooling and process requirements, and can be unlocked from two directions: lifting the locking body 1 upward to unlock, and pressing the locking body 1 downward to unlock.

[0048] Another embodiment of the locking body 1 is to have elastic locking portions 11 on both ends of the locking body 1. The corresponding first grooves can be provided on one side or on both sides of the blade root of the blade 2. In this case, when multiple sets of blades 2 and the wheel disc 3 are engaged, both sides of the blade 2 are locked in the locked state, thereby improving the reliability of the locking assembly.

[0049] The present invention also provides a compressor comprising blades 2, a disk 3, the roots of the blades 2 being mounted within the disk 3, and the aforementioned axial locking assembly. The compressor including the axial locking assembly is quick to install and easy to disassemble, thereby improving the efficiency of compressor installation and maintenance without requiring special tooling or process requirements.

[0050] From the above description, it can be seen that in the locking assembly of the present invention, the locking body 1 only uses one type of parts to achieve the locking of the entire impeller, effectively reducing the types of part specifications, and the locking body is designed as an elastic structure to achieve unlocking in two directions without destroying the parts, and the locking body can be reused.

[0051] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A compressor blade axial locking assembly, wherein the blade root of the blade (2) is mounted in a wheel (3), characterized in that: The locking assembly comprises a first mounting portion (21), a second mounting portion (31), and a locking body (1); the first mounting portion (21) is arranged on the blade root, the second mounting portion (31) is arranged on the wheel disc, the locking body can be at least partially accommodated in an accommodating cavity formed by the first mounting portion (21) and the second mounting portion (31) to limit the relative displacement of the blade root and the wheel disc (3) in an axial direction; the locking body (1) is an integrated elastic structure; The locking body (1) is arc-shaped and includes a limiting portion (13) and an elastic locking portion (11). The elastic locking portion (11) is arranged at one end of the limiting portion (13). In the locked state, the limiting portion (13) is accommodated in the second mounting portion (31). The elastic locking portion (11) is accommodated in the second mounting portion (31) and extends to the first mounting portion (21). The locking body (1) also includes a positioning portion, which is at the other end of the limiting portion (13). The positioning portion includes an end bevel, and the end bevel abuts against the side surface of the blade root. The elastic locking portion (11) is an elastically deformable structure. The elastic locking portion (11) is provided with a plurality of cutout grooves on two opposite sides in the radial direction of the blade root. The plurality of cutout grooves on one side and the plurality of cutout grooves on the other side are staggered to form a meandering groove structure.

2. A compressor blade axial locking assembly, wherein the blade root of the blade (2) is installed in the wheel (3), characterized in that: The locking assembly comprises a first mounting portion (21), a second mounting portion (31), and a locking body (1); the first mounting portion (21) is arranged on the blade root, the second mounting portion (31) is arranged on the wheel disc, the locking body can be at least partially accommodated in an accommodating cavity formed by the first mounting portion (21) and the second mounting portion (31) to limit the relative displacement of the blade root and the wheel disc (3) in an axial direction; the locking body (1) is an integrated elastic structure; The locking body (1) extends in a long strip shape and comprises a limiting portion (13) and two elastic locking portions (11), wherein the two elastic locking portions (11) are arranged at both ends of the limiting portion (13); the elastic locking portion (11) is an elastically deformable structure; the elastic locking portion (11) is provided with a plurality of cutout grooves on two opposite sides in the radial direction of the blade root, wherein the plurality of cutout grooves on one side and the plurality of cutout grooves on the other side are staggered with each other to form a meandering groove structure.

3. The axial locking assembly according to claim 1, wherein: The locking body (1) comprises a locked state and an unlocked state. In the locked state, the locking body is at least partially accommodated in the accommodating cavity by elastic deformation, pressing against the blade root or the wheel disc (3) to lock. In the unlocked state, the locking body is at least partially removed from the accommodating cavity, releasing the relative displacement restriction of the blade root and the wheel disc (3) in the axial direction.

4. The axial locking assembly according to claim 3, characterized in that: In the locked state, the position of the elastic locking portion (11) in the radial direction of the blade root is higher than the position of the limiting portion (13), so that the elastic locking portion (11) can be elastically deformed downward to disengage from the second mounting portion (31), thereby achieving an unlocked state between the blade root and the wheel disc (3).

5. The axial locking assembly according to claim 3, wherein: The elastic locking portion (11) includes a process hole (12), and the elastic locking portion (11) is lifted upward through the process hole (12) to disengage from the first mounting portion (21), thereby achieving an unlocked state between the blade root and the wheel disc (3).

6. The axial locking assembly according to claim 4, characterized in that: The first mounting portion (21) is a first groove capable of accommodating the elastic locking portion (11), and the second mounting portion (31) is a second groove capable of accommodating the limiting portion (13).

7. The axial locking assembly according to claim 6, wherein: The cross section of the limiting portion (13) is trapezoidal or T-shaped to prevent the locking body (1) from being disengaged from the second groove.

8. The axial locking assembly according to claim 6, wherein: The cross section of the second groove is trapezoidal or T-shaped.

9. The axial locking assembly according to claim 2, wherein: The locking body (1) is made of titanium alloy.

10. A compressor, comprising a blade (2) and a wheel (3), wherein the blade root of the blade (2) is mounted in the wheel (3), and is characterized in that: It also includes the axial locking assembly according to any one of claims 1-3.

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