CN219045425U - Positioning assembly structure of gas turbine blade and wheel disc - Google Patents

Abstract

The utility model provides a positioning and assembling structure of a gas turbine blade and a wheel disc, and relates to the technical field of gas turbines. The device comprises a blade, a wheel disc, a positioning piece and a locking piece; the bottom surface of the root of the blade is provided with a positioning connecting part; the blade installation part of the wheel disc is provided with a slot and an opening part, the opening part is provided with a positioning hole and a locking hole, the opening direction of the positioning hole is arranged along the radial direction of the wheel disc, and the opening direction of the locking hole is arranged along the axial direction of the wheel disc; the positioning piece is arranged in the positioning hole and the positioning connecting part in a penetrating way; the locking piece is connected to the locking hole and compresses tightly the locating piece. According to the utility model, the axial limit of the blade and the wheel disc is realized through the matching of the slot and the root of the blade, the axial and radial positioning of the blade and the wheel disc is realized through the matching of the positioning piece, the positioning connecting part and the positioning hole, and then the locking piece is utilized for locking and fixing, so that the structure is simple, the strength is stable after the assembly, the assembly efficiency is greatly improved, and the universal positioning device has good universality.

Description

Positioning assembly structure of gas turbine blade and wheel disc

Technical Field

The utility model relates to the technical field of gas turbines, in particular to a positioning and assembling structure of a gas turbine blade and a wheel disc.

Background

The rotor blade of the fluid rotary machine is arranged in the wheel groove of the wheel disc through the blade root, and because the blade root of the blade is mostly the fir tree blade root, the dovetail blade root and the like, the wheel groove of the wheel disc is an axial through groove matched with the rotor blade, and in order to ensure the axial positions of all the blades on the wheel disc to be consistent and prevent the blades from sliding from the wheel groove, locking keys or screws are usually adopted for locking and positioning.

At present, a positioning mode of axially installing blades of large and medium-sized fluid rotary machines is generally to open positioning grooves or positioning holes at the rim part, and the positioning of moving blades is realized through locking keys or screws, so that the strength of the rim is weakened, and the safety of a rotor is influenced; in addition, for the medium-sized and small-sized fluid rotary machine, the rim thickness of the fluid rotary machine is small compared with that of the rim, if the positioning mode is adopted, the rim cannot meet the strength requirement, and the machining difficulty and the mounting difficulty of the locking key and the locking key groove are large, so that the assembly efficiency is influenced.

Disclosure of Invention

The utility model aims to provide a positioning and assembling structure of a gas turbine blade and a wheel disc, which aims to solve the problems of low rim strength, high processing difficulty and high installation difficulty of the existing blade assembling structure.

In order to solve the problems, the utility model firstly provides a positioning and assembling structure of a gas turbine blade and a wheel disc, which comprises the blade, the wheel disc, a positioning piece and a locking piece; the blade comprises a blade part and a blade root part which are connected, and a positioning connection part is arranged on the bottom surface of the blade root part; the wheel disc is provided with a plurality of blade installation parts along the circumferential direction, the outer edge of each blade installation part is provided with a slot which is matched with the blade root part and limits the axial displacement of the blade root part, one end surface of each blade installation part is provided with a positioning hole and a locking hole, the opening direction of each positioning hole is along the radial direction of the wheel disc, the opening direction of each locking hole is along the axial direction of the wheel disc, and the positioning holes are communicated with the locking holes; the positioning piece part is penetrated in the positioning hole, and one end of the positioning piece part is inserted into the positioning connecting part; the locking piece is connected to the locking hole, and one end of the locking piece is tightly pressed against the positioning piece.

By adopting the technical scheme, the axial limit of the blade and the wheel disc is realized through the matching of the slot and the root of the blade, the axial and radial positioning of the blade and the wheel disc are realized through the matching of the positioning piece and the positioning connecting part and the positioning hole respectively, and then the locking piece is utilized for locking and fixing, so that the structure is simple, the strength is stable after the assembly, the assembly efficiency is greatly improved, and the positioning device has universality and can be suitable for positioning assembly of moving blades of a gas turbine, an aeroengine, a steam turbine, an axial flow compressor and the like.

Further, the positioning connection is one of a hole and a slot.

By adopting the technical scheme, the matching with the locating piece is realized through the hole opening or slotting structure, the structure is simple, and the processing is easy.

Further, a groove is formed in the end face of the blade mounting portion, the groove is provided with a first side wall close to the slot and a second side wall deviating from the slot, the first side wall is provided with the positioning hole, and the locking hole is formed between the slot and the groove.

By adopting the technical scheme, the positioning holes are formed in the side wall of the groove, the locking holes are formed between the slot and the groove, and the structure is simple.

Further, the first side wall, the second side wall and the bottom wall of the groove are arranged in parallel.

By adopting the technical scheme, the first side wall, the second side wall and the bottom wall of the groove are designed to be parallel, so that the locating piece can be conveniently inserted into the locating hole, and the assembly efficiency is improved.

Further, the end face of the blade mounting part is provided with a boss, and the locking hole and the positioning hole are both formed in the boss.

By adopting the technical scheme, the positioning holes and the positioning holes are formed through boss processing, so that the punching operation is facilitated, and the processing efficiency is improved.

Further, the locating piece includes head and pole portion in proper order along its length direction, the head is at least partly inserted and is located in the location connecting portion, the pole portion is equipped with the press fit plane, retaining member one end compresses tightly the press fit plane.

By adopting the technical scheme, the locking piece is more beneficial to tightly pressing the positioning piece through the cooperation of the tightly pressing plane and the locking piece, and a better stabilizing effect is achieved on the positioning piece.

Further, the locking piece is a fastening bolt, and the locking hole is a screw hole matched with the fastening bolt.

By adopting the technical scheme, the operation is simple when the fastening bolt is assembled, and the positioning assembly efficiency is improved.

Further, the blade mounting part further comprises a locking gasket, wherein the fastening bolt comprises a screw cap and a screw rod, and the locking gasket is sleeved on the screw rod and is pressed on the blade mounting part by the screw rod.

By adopting the technical scheme, the fastening bolt can be better fixed in the screw hole through the locking gasket, so that the pressure of the screw to the locating piece can be stably maintained, and the structural stability after assembly is improved.

Further, at least one of two opposite sides of the blade root is provided with a limiting flange extending outwards, and the side wall of the slot is provided with an inner concave part matched with the limiting flange.

By adopting the technical scheme, the limit to the axial displacement of the blade root is realized through the cooperation of the concave part and the limit flange, the structure is simple, the guide function can be realized during the assembly, and the device is integrated and multipurpose.

Furthermore, the two side edges of the limit flange and the concave part are arc transition structures.

By adopting the technical scheme, the limit flange and the edge of the concave part are designed into circular arc transition, so that the limit flange and the edge of the concave part are convenient to match, and the friction resistance in the assembly process is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a blade according to an embodiment of the present utility model;

FIG. 2 is a schematic view (I) of a blade mounting portion of a wheel disc according to an embodiment of the present utility model;

fig. 3 is a schematic structural view (ii) of a blade mounting portion of a wheel disc according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a positioning member according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of a locking member according to an embodiment of the present utility model;

FIG. 6 is a schematic view of an assembled blade and disk according to an embodiment of the present utility model;

FIG. 7 is a diagram illustrating an assembly relationship between a blade and a disk according to an embodiment of the present utility model.

Reference numerals illustrate:

100-leaf blades; 110-blade section; 120-leaf root; 121-positioning the connection; 122-a limit flange;

200-a wheel disc; 210-blade mounting section; 211-slots; 2111-an inner recess; 212-a hole part; 2121-locating holes; 2122-locking holes; 2123-groove; 21231-first side wall; 21232-a second sidewall; 2124-perforated boss;

300-positioning piece; 310-head; 320-a stem; 321-press fit plane;

400-locking piece; 410-nut; 420-screw.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In order to solve the problems of complex structure, low efficiency and influence on rim strength existing in the assembly of the existing blades and impellers, the embodiment firstly provides a positioning assembly structure of the blades and the wheel disc of the gas turbine, and aims to solve the technical problems through improvement of the positioning assembly structure.

Referring to fig. 1, the positioning assembly structure of the present embodiment first improves the structure of the blade 100, where the blade 100 includes a blade portion 110 and a blade root portion 120 that are connected, the blade root portion 120 and the blade portion 110 may be integrally formed or integrally connected, or may of course be butted by adopting other connection modes, the bottom surface of the blade root portion 120 of the present embodiment is provided with a positioning connection portion 121, and the positioning connection portion 121 may be a hole or a slot structure, or may of course be other structures capable of accommodating the end portion of the positioning member 300, which is not described one by one in this embodiment.

Referring to fig. 2 and 3, the drawings of the present embodiment only show a part of the structure of the wheel disc 200, the wheel disc 200 is provided with a plurality of blade mounting portions 210 along its own circumference, in order to facilitate the mounting and positioning of the blade portion 110, the present embodiment is provided with slots 211 adapted to the blade root portion 120 and limiting the axial displacement of the blade root portion 120 at the outer edge of the blade mounting portion 210, one end surface of the blade mounting portion 210 perpendicular to the axial direction thereof is provided with an opening 212, the opening 212 of the present embodiment is provided with a positioning hole 2121 and a locking hole 2122, the positioning hole 2121 and the locking hole 2122 are configured to be mutually perpendicular, the opening direction of the positioning hole 2121 is set along the radial direction of the wheel disc 200, and the opening direction of the locking hole 2122 is set along the axial direction of the wheel disc 200.

Referring to fig. 4 and 5, the positioning structure of the present embodiment further includes a positioning member 300 and a locking member 400, where the positioning member 300 of the present embodiment is partially inserted into the positioning hole 2121, and one end of the positioning member is inserted into the positioning connection portion 121, and the locking member 400 of the present embodiment is connected to the locking hole 2122, and one end of the positioning member 300 is pressed.

Referring to fig. 6 and 7, when assembling the blade 100, the blade root 120 is first installed into the slot 211 and the two ends of the blade root 120 are aligned with the two ends of the slot 211, at this time, the positioning connection portion 121, which is a hole or a slot, is just opposite to the positioning hole 2121 of the Ji Kaikong portion 212, and then the positioning member 300 is installed through the positioning hole 2121, so that the upper end of the positioning member 300 is inserted into the positioning connection portion 121, the rest of the positioning member 300 is located in the positioning hole 2121, and finally the locking member 400 is installed through the locking hole 2122 to compress the positioning member 300, thereby completing the positioning assembly of the blade 100 and the wheel disc 200.

Based on the above description, the assembly structure of the present embodiment realizes axial limitation of the blade 100 and the wheel disc 200 through the cooperation of the slot 211 and the blade root 120, realizes axial and radial positioning of the blade 100 and the wheel disc 200 through the cooperation of the positioning piece 300 and the positioning connection portion 121 and the positioning hole 2121, and then uses the locking piece 400 to lock and fix, so that the structure is simple, the strength is stable after assembly, the assembly efficiency is greatly improved, and the assembly structure has universality, and can be suitable for positioning assembly of the moving blades 100 of a gas turbine, an aeroengine, a steam turbine, an axial compressor and the like.

Referring to fig. 2 and fig. 3 again, there are at least two structural forms of the hole portion 212 in this embodiment, one is shown in the drawings, the hole portion 212 includes a groove 2123 formed on an end surface of the blade mounting portion 210, the groove 2123 has a first sidewall 21231 close to the slot 211 and a second sidewall 21232 facing away from the slot 211, the first sidewall 21231 is provided with the positioning hole 2121, after the groove 2123 is provided with the groove 2123, the blade mounting portion 210 forms a hole boss 2124 between the groove 2123 and the slot 211, and the locking hole 2122 in this embodiment is provided on the hole boss 2124 between the slot 211 and the groove 2123, so that the positioning hole 2121 is formed on a sidewall of the groove 2123, and the locking hole 2122 is formed between the slot 211 and the groove 2123.

Referring to fig. 2 again, optionally, the first side wall 21231, the second side wall 21232 and the bottom wall of the groove 2123 are all arranged in parallel, so that the positioning member 300 is convenient to be inserted into the positioning hole 2121, and the assembly efficiency can be further improved.

In addition to the manner of the groove 2123, the hole portion 212 of the present embodiment may be provided with a boss (such a structure is not shown in the drawing) on the end face of the blade mounting portion 210, and the locking hole 2122 and the positioning hole 2121 of the present embodiment are both formed in the boss, so that the positioning hole 2121 and the positioning hole 2121 are formed by processing the boss, which is convenient for the hole opening operation, and can further improve the processing efficiency.

Referring to fig. 4, the positioning member 300 of this embodiment is in a pin structure, the whole of the positioning member 300 is similar to a cylindrical shape, the positioning member 300 of this embodiment sequentially includes a head 310 and a rod 320 along the length direction thereof, the head 310 is in a regular cylindrical shape, and the head 310 is at least partially inserted into the positioning connection portion 121, the rod 320 of this embodiment is formed with a press-fit plane 321 through cutting and other procedures, one end of the locking member 400 is pressed against the press-fit plane 321, and the locking member 400 is more beneficial to the locking member 400 to press against the positioning member 300 through the cooperation of the press-fit plane 321 and the locking member 400, so that a better stabilizing effect is achieved on the positioning member 300.

Referring to fig. 5, the locking member 400 of this embodiment is a fastening bolt, where the fastening bolt includes a nut 410 and a screw 420, and correspondingly, the locking hole 2122 of this embodiment is a screw hole adapted to the fastening bolt, and during assembling, the fastening bolt is only required to be screwed into the screw hole, so that the operation is simple, the assembly positioning difficulty is further reduced, and the positioning assembly efficiency is improved.

Optionally, the positioning structure of this embodiment may further include a locking gasket (not shown in the figure), where the locking gasket of this embodiment is sleeved on the screw 420 and is pressed by the screw 420 on the blade mounting portion 210 after being assembled, and by adopting this structural design, the fastening bolt can be better fixed in the screw hole through the locking gasket, so that the pressure of the screw 420 on the positioning member 300 can be stably maintained, and the structural stability after being assembled is improved.

Referring to fig. 1 and fig. 2 again, in order to limit axial displacement of the blade root 120 by the slot 211, at least one of two opposite sides of the blade root 120 in this embodiment is provided with an outwardly extending limit flange 122, and correspondingly, a concave portion 2111 adapted to the limit flange 122 is provided on a side wall of the slot 211 in this embodiment, so that axial displacement of the blade root 120 can be limited by cooperation of the concave portion 2111 and the limit flange 122, and the device has a simple structure, and can have a guiding function during assembly, and is multipurpose.

In addition, the two side edges of the limit flange 122 and the concave portion 2111 in the embodiment are arc transition structures, so that the limit flange and the concave portion 2111 can be matched conveniently, and friction resistance in the assembly process is reduced.

Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A positioning assembly structure of a gas turbine blade and a wheel disc, comprising:

the blade (100) comprises a blade part (110) and a blade root part (120) which are connected, wherein a positioning connection part (121) is arranged on the bottom surface of the blade root part (120);

the wheel disc (200) is provided with a plurality of blade mounting portions (210) along the circumferential direction, the outer edge of each blade mounting portion (210) is provided with a slot (211) which is matched with the blade root portion (120) and limits the axial displacement of the blade root portion (120), one end face of each blade mounting portion (210) is provided with a positioning hole (2121) and a locking hole (2122), the hole opening direction of each positioning hole (2121) is arranged along the radial direction of the wheel disc (200), the hole opening direction of each locking hole (2122) is arranged along the axial direction of the wheel disc (200), and the positioning holes (2121) are communicated with the locking holes (2122);

a positioning member (300) which is partially inserted into the positioning hole (2121) and has one end inserted into the positioning connection portion (121);

and a locking member (400) connected to the locking hole (2122) and having one end pressed against the positioning member (300).

2. The positioning assembly structure of a gas turbine blade and a disk according to claim 1, wherein the positioning connection portion (121) is one of a hole and a groove.

3. The positioning assembly structure of a gas turbine blade and a wheel disc according to claim 1, wherein a groove (2123) is formed in an end face of the blade mounting portion (210), the groove (2123) is provided with a first side wall (21231) close to the slot (211) and a second side wall (21232) away from the slot (211), the first side wall (21231) is provided with a positioning hole (2121), and the locking hole (2122) is formed between the slot (211) and the groove (2123).

4. A positioning assembly structure of a gas turbine blade and a wheel disc according to claim 3, characterized in that the first side wall (21231), the second side wall (21232) are arranged parallel to the bottom wall of the groove (2123).

5. The positioning assembly structure of a gas turbine blade and a wheel disc according to claim 1, wherein a boss is provided on an end surface of the blade mounting portion (210), and the positioning hole (2121) and the locking hole (2122) are both provided on the boss.

6. The positioning assembly structure of a gas turbine blade and a wheel disc according to claim 1, wherein the positioning member (300) sequentially comprises a head portion (310) and a rod portion (320) along the length direction thereof, the head portion (310) is at least partially inserted into the positioning connection portion (121), the rod portion (320) is provided with a press fit plane (321), and one end of the locking member (400) is pressed against the press fit plane (321).

7. The positioning and assembling structure of a gas turbine blade and a wheel disc according to claim 1, wherein the locking member (400) is a fastening bolt, and the locking hole (2122) is a screw hole adapted to the fastening bolt.

8. The positioning assembly structure of a gas turbine blade and a wheel disc according to claim 1, further comprising a locking washer, wherein the locking member (400) is a fastening bolt comprising a nut (410) and a screw (420), and the locking washer is sleeved on the screw (420) and is pressed against the blade mounting portion (210) by the screw (420).

9. The positioning and assembling structure of a gas turbine blade and a wheel disc according to claim 1, wherein at least one of two opposite sides of the blade root (120) is provided with an outwardly extending limit flange (122), and the side wall of the slot (211) is provided with an inner concave portion (2111) adapted to the limit flange (122).

10. The positioning and assembling structure of a gas turbine blade and a wheel disc according to claim 9, wherein both side edges of the limit flange (122) and the concave portion (2111) are arc transition structures.

Images