Stationary blade assembly, turbine and gas turbine

Abstract

The utility model discloses a stationary blade assembly, a turbine and a gas turbine, the stationary blade assembly comprises a holding ring, a stationary blade and an adjusting piece, the holding ring is provided with a holding ring groove and a through hole, and the through hole is formed in the outer side of the holding ring groove and penetrates through the outer side groove wall of the holding ring groove; the fixed blade is provided with a hook, and the hook is arranged in the ring holding groove and matched with the ring holding groove in a hooking mode. The adjusting part is connected with the holding ring in the mode that the position of the adjusting part can be adjusted in the inside-outside direction, the adjusting part is arranged in the through hole, and a part of the adjusting part extends into the holding ring groove. When the whole adjusting piece is located on the outer side of the ring holding groove, the space, used for containing the hook, in the ring holding groove is large, so that the gap between the hook and the ring holding groove is large, and the assembling efficiency of the stationary blade is improved. After one part of the adjusting piece extends into the ring holding groove, the gap between the adjusting piece and the hook is small, the static blade can be prevented from moving in the radial direction, and the operation safety of the turbine with the static blade assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbines, in particular to a stationary blade assembly, a turbine and a gas turbine. Background Art

[0002] The stator blade of the gas turbine is assembled with a ring holding hook. Specifically, the outer edge plate of the stator blade is provided with a hook, and the inner side of the ring holding groove is provided with a ring holding groove. The hook and the ring holding groove are hooked and matched, and there is a gap between the hook and the bottom of the ring holding groove. After the stator blade and the ring holding ring are assembled, the stator blade is equivalent to a cantilever beam structure. The mass of the stator blade is large and the gap between the hook and the ring holding groove is small. The stator blade is hoisted and assembled on site by a crane, which is difficult to assemble and leads to low assembly efficiency of the stator blade.

[0003] It is understandable that the larger the gap between the hook and the ring holding groove, the more convenient it is to assemble the stationary blades and the more conducive it is to improve the assembly efficiency of the stationary blades. However, the larger the gap between the hook and the ring holding groove, the more likely the stationary blades will experience radial displacement due to thermal expansion and contraction after experiencing temperature changes, resulting in a higher risk of turbine operation safety. Therefore, how to improve the operation safety of the turbine while improving the assembly efficiency of the stationary blades is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the utility model proposes a stationary blade assembly to improve the operating safety of the turbine while improving the assembly efficiency of the stationary blades.

[0006] The stationary blade assembly of the utility model comprises a holding ring, a stationary blade and an adjusting member, the holding ring being provided with a ring holding groove and a through hole, the through hole being provided at the outer side of the ring holding groove and penetrating the outer groove wall of the ring holding groove; the stationary blade being provided with a hook, the hook being provided in the ring holding groove and being hooked and matched with the ring holding groove; the adjusting member being connected to the holding ring in an adjustable position along the inner and outer directions, the adjusting member being provided in the through hole and a part of the adjusting member extending into the ring holding groove.

[0007] Optionally, a gap between an outer end surface of the hook and an outer groove wall of the ring-holding groove is 1 mm to 5 mm.

[0008] Optionally, a gap between an outer end surface of the hook and an inner end of the adjusting member is less than or equal to 0.1 mm.

[0009] Optionally, the through hole is provided with an internal thread, the adjusting member includes a rod body, the rod body includes a first rod segment, the first rod segment is provided with an external thread, and the first rod segment is threadedly connected to the internal thread.

[0010] Optionally, the rod body includes a second rod segment, the second rod segment is arranged on the inner side of the first rod segment, the outer peripheral surface of the second rod segment is a smooth surface, and a part of the second rod segment extends into the ring holding groove.

[0011] Optionally, the adjusting member includes a screwing portion for cooperating with a tool, and the screwing portion is arranged on the outside of the rod body and connected to the rod body.

[0012] Optionally, the screwing portion includes an outer hexagonal structure and / or an inner hexagonal structure.

[0013] Optionally, the through hole includes a first hole segment and a second hole segment, the aperture of the second hole segment is larger than the aperture of the first hole segment, the rod body is disposed in the first hole segment, and the screwing portion is disposed in the second hole segment.

[0014] The utility model also provides a turbine.

[0015] The turbine of the utility model comprises any one of the above-mentioned stationary blade assemblies.

[0016] The utility model also provides a gas turbine.

[0017] The gas turbine of the utility model comprises any one of the turbines described above.

[0018] When assembling the stationary blade, the position of the adjusting member can be adjusted first so that the adjusting member is located outside the ring holding groove as a whole; then, the hook of the stationary blade is hooked and matched with the ring holding groove; after that, the position of the adjusting member is adjusted again so that a part of the adjusting member extends into the ring holding groove. When the adjusting member is located outside the ring holding groove as a whole, the space in the ring holding groove for accommodating the hook is larger, so that the gap between the hook and the ring holding groove is larger, which is convenient for the assembly of the stationary blade and is conducive to improving the assembly efficiency of the stationary blade. After a part of the adjusting member extends into the ring holding groove, the gap between the adjusting member and the hook is smaller, which can prevent the stationary blade from radial movement and improve the operating safety of the turbine with the stationary blade assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the structure of the connection between the stationary blade and the holding ring of the turbine in one embodiment.

[0020] Figure 2 It is a cross-sectional view of the connection between the stationary blade and the holding ring of a turbine according to one embodiment of the utility model.

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0022] Reference numerals:

[0023] 100. Stationary blade assembly;

[0024] 1. holding ring; 11. holding ring groove; 12. through hole; 121. first hole section; 122. second hole section;

[0025] 2. Stationary blade; 21. Hook; 22. Stationary blade; 23. Outer edge plate;

[0026] 3. Adjusting member; 31. Rod body; 311. First rod section; 312. Second rod section; 32. Screwing portion. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0028] like Figures 1 to 3 As shown, the stationary blade assembly 100 of the embodiment of the utility model includes a holding ring 1, a stationary blade 2 and an adjusting member 3. The holding ring 1 is provided with a ring holding groove 11 and a through hole 12. The through hole 12 is provided on the outer side of the ring holding groove 11 and passes through the outer groove wall of the ring holding groove 11. The stationary blade 2 is provided with a hook 21, and the hook 21 is provided in the ring holding groove 11 and is hooked with the ring holding groove 11. The adjusting member 3 is connected to the holding ring 1 in an adjustable position along the inner and outer directions. The adjusting member 3 is provided in the through hole 12 and a part of the adjusting member 3 extends into the ring holding groove 11.

[0029] The term "inward" refers to a direction close to the axis of the holding ring 1 on a plane perpendicular to the axis of the holding ring 1; and the term "outward" refers to a direction away from the axis of the holding ring 1 on a plane perpendicular to the axis of the holding ring 1. The position of the adjusting member 3 is adjustable along the inward and outward directions, which means that the radial position of the adjusting member 3 along the holding ring 1 is adjustable.

[0030] When assembling the stationary blade 2, the position of the adjusting member 3 can be adjusted first so that the adjusting member 3 is located outside the ring holding groove 11 as a whole; then, the hook 21 of the stationary blade 2 is hooked and matched with the ring holding groove 11; thereafter, the position of the adjusting member 3 is adjusted again so that a part of the adjusting member 3 extends into the ring holding groove 11. When the adjusting member 3 is located outside the ring holding groove 11 as a whole, the space in the ring holding groove 11 for accommodating the hook 21 is large, so that the gap between the hook 21 and the ring holding groove 11 is large, which facilitates the assembly of the stationary blade 2 and helps to improve the assembly efficiency of the stationary blade 2. After a part of the adjusting member 3 extends into the ring holding groove 11, the gap between the adjusting member 3 and the hook 21 is small, which can prevent the stationary blade 2 from radial movement and improve the operating safety of the turbine having the stationary blade assembly 100.

[0031] In addition, when disassembling the stationary blade 2, the position of the adjusting member 3 can be adjusted first so that the adjusting member 3 is located outside the ring holding groove 11 as a whole; then, the hook 21 of the stationary blade 2 is taken out from the ring holding groove 11. When the adjusting member 3 is located outside the ring holding groove 11 as a whole, the gap between the hook 21 and the ring holding groove 11 is large, which facilitates the removal of the stationary blade 2, thereby facilitating the disassembly of the stationary blade 2 and improving the disassembly efficiency of the stationary blade 2.

[0032] Alternatively, if Figure 2 As shown, the stationary blade 2 includes a stationary blade 22 and an outer edge plate 23 , the stationary blade 22 is arranged on the inner side of the outer edge plate 23 and connected to the outer edge plate 23 , and the hook 21 is arranged on the outer side of the outer edge plate 23 and connected to the outer edge plate 23 .

[0033] In the related art, the fitting clearance between the hook of the stationary blade and the ring holding groove of the holding ring is generally less than 0.5 mm, which makes the assembly of the stationary blade more difficult.

[0034] In some embodiments, the gap between the outer end surface of the hook 21 and the outer groove wall of the ring holding groove 11 is 1 mm to 5 mm.

[0035] For example, Figure 3 As shown, the gap between the outer end surface of the hook 21 and the outer groove wall of the ring holding groove 11 is L, and L is 1mm to 5mm.

[0036] By setting the clearance between the outer end surface of the hook 21 and the outer groove wall of the ring holding groove 11 to 1 mm to 5 mm, the matching clearance between the hook 21 and the ring holding groove 11 is large, which facilitates the installation of the hook 21 into the ring holding groove 11, thereby effectively reducing the installation difficulty of the stationary blade 2 and further improving the assembly efficiency of the stationary blade 2. In addition, it is also convenient to remove the hook 21 from the ring holding groove 11, further improving the disassembly efficiency of the stationary blade 2.

[0037] In some embodiments, the gap between the outer end surface of the hook 21 and the inner end of the adjusting member 3 is less than or equal to 0.1 mm.

[0038] By setting the gap between the outer end surface of the hook 21 and the inner end of the adjusting part 3 to be less than or equal to 0.1 mm, the fitting gap between the hook 21 and the adjusting part 3 is smaller, which can effectively prevent the radial displacement of the stator blade 2 due to the influence of thermal expansion and contraction after experiencing temperature changes, which is beneficial to further improve the operating safety of the turbine with the stator blade assembly 100.

[0039] In some embodiments, Figure 2 As shown, the through hole 12 is provided with an internal thread, the adjusting member 3 includes a rod body 31, the rod body 31 includes a first rod segment 311, the first rod segment 311 is provided with an external thread, and the first rod segment 311 is threadedly connected to the internal thread. In other words, the adjusting member 3 is threadedly connected to the through hole 12.

[0040] By threading the first rod section 311 of the adjusting member 3 with the through hole 12, the position of the adjusting member 3 can be adjusted in the inner and outer directions by screwing the adjusting member 3. Thus, the position of the adjusting member 3 can be adjusted conveniently, which is conducive to further improving the assembly efficiency of the stationary blade 2.

[0041] After the adjusting member 3 is adjusted into place, a certain initial pre-tightening force is generally given to the adjusting member 3 , wherein the magnitude of the pre-tightening force is based on the ability to share the dead weight of the stationary blade 2 .

[0042] Alternatively, if Figure 2 As shown, the rod body 31 includes a second rod segment 312, and the second rod segment 312 is arranged on the inner side of the first rod segment 311. The outer peripheral surface of the second rod segment 312 is a smooth surface, and a part of the second rod segment 312 extends into the ring holding groove 11.

[0043] It is understandable that when the temperature of the stationary blade 2 is high, the hook 21 will expand thermally, that is, the size of the hook 21 will increase. At this time, the hook 21 may contact the rod body 31, and there will be an interaction force between the hook 21 and the rod body 31. If there is an external thread at the position of the rod body 31 that contacts the hook 21, the external thread at this position is easily squeezed by the hook 21, affecting the position adjustment of the adjustment member 3, and further affecting the removal of the stationary blade 2. By setting the outer peripheral surface of the second rod section 312 of the rod body 31 as a smooth surface, it can effectively prevent the external thread of the adjustment member 3 from being squeezed and affecting the removal of the stationary blade 2.

[0044] Alternatively, if Figure 2 As shown, the adjusting member 3 includes a screwing portion 32 for cooperating with a tool, and the screwing portion 32 is arranged on the outside of the rod body 31 and connected to the rod body 31. The tool may be a wrench.

[0045] By providing a screwing portion 32 that cooperates with a tool on the adjusting member 3, when the position of the adjusting member 3 needs to be adjusted, the tool can be used to cooperate with the screwing portion 32, and then the adjusting member 3 can be screwed by the tool to facilitate the position adjustment of the adjusting member 3, thereby further improving the assembly and disassembly efficiency of the stationary blade 2.

[0046] Optionally, the screwing portion 32 includes an outer hexagonal structure and / or an inner hexagonal structure. In other words, the screwing portion 32 includes an outer hexagonal structure or an inner hexagonal structure; or, the screwing portion 32 includes an outer hexagonal structure and an inner hexagonal structure.

[0047] Since the outer hexagonal structure and the inner hexagonal structure are easy to match with existing tools, by setting the screwing part 32 to include the outer hexagonal structure and / or the inner hexagonal structure, it is possible to avoid setting up a separate tool to match the screwing part 32, which is beneficial to reducing the cost of the stationary blade assembly 100.

[0048] In some embodiments, Figure 2 As shown, the through hole 12 includes a first hole section 121 and a second hole section 122, and the aperture of the second hole section 122 is larger than the aperture of the first hole section 121. The rod body 31 is disposed in the first hole section 121, and the screwing portion 32 is disposed in the second hole section 122.

[0049] By setting the screwing part 32 in the second hole section 122, the screwing part 32 can be prevented from being exposed outside the holding ring 1. On the one hand, it is beneficial to improve the safety of the adjustment member 3; on the other hand, it can prevent the adjustment member 3 from affecting the connection between the holding ring 1 and other components.

[0050] The stator blade assembly 100 of the embodiment of the utility model is provided with an adjustment member 3 so that the fitting clearance between the hook 21 and the ring holding groove 11 can be larger, and the stator blade 2 and the holding ring 1 can be quickly assembled under the large clearance. After the hook 21 of the stator blade 2 is installed in the ring holding groove 11 of the holding ring 1, the fitting clearance between the adjustment member 3 and the hook 21 can be changed by changing the position of the adjustment member 3 in the inner and outer directions, so that the fitting clearance between the adjustment member 3 and the stator blade 2 is smaller, so as to avoid radial movement of the stator blade 2. On the one hand, the assembly difficulty of the stator blade 2 can be reduced, and the rapid assembly of the stator blade 2 can be achieved; on the other hand, the position of the adjustment member 3 is adjustable, so that the assembly clearance of the stator blade 2 is adjustable, and the adjustment member 3 is replaceable. In addition, it is also convenient to disassemble the stator blade 2, so as to facilitate the inspection and replacement of the stator blade 2 at a later time.

[0051] The turbine of the embodiment of the utility model includes the stationary blade assembly 100 described in any of the above embodiments.

[0052] Since the assembly efficiency of the stationary blade assembly 100 is relatively high and the stationary blades 2 are not prone to radial movement after assembly, the turbine according to the embodiment of the utility model has the advantages of high assembly efficiency and good safety.

[0053] The gas turbine of the embodiment of the utility model includes the turbine described in any of the above embodiments.

[0054] Since the turbine of the embodiment of the utility model has the advantages of high assembly efficiency and good safety, the gas turbine of the embodiment of the utility model has the advantages of low cost and good safety.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A stationary blade assembly, characterized in that: include: A holding ring, wherein the holding ring is provided with a ring holding groove and a through hole, wherein the through hole is provided on the outer side of the ring holding groove and passes through the outer groove wall of the ring holding groove; A stationary blade, wherein the stationary blade is provided with a hook, and the hook is arranged in the ring holding groove and is hooked and matched with the ring holding groove; An adjusting member is connected to the holding ring in an adjustable manner along the inner and outer directions. The adjusting member is arranged in the through hole and a part of the adjusting member extends into the holding ring groove.

2. The stationary blade assembly according to claim 1, characterized in that: The gap between the outer end surface of the hook and the outer groove wall of the ring holding groove is 1mm to 5mm.

3. The stationary blade assembly according to claim 1, characterized in that: A gap between the outer end surface of the hook and the inner end of the adjusting member is less than or equal to 0.1 mm.

4. The stationary blade assembly according to any one of claims 1 to 3, characterized in that: The through hole is provided with an internal thread, the adjusting member includes a rod body, the rod body includes a first rod segment, the first rod segment is provided with an external thread, and the first rod segment is threadedly connected with the internal thread.

5. The stationary blade assembly according to claim 4, characterized in that: The rod body comprises a second rod segment, the second rod segment is arranged on the inner side of the first rod segment, the outer peripheral surface of the second rod segment is a smooth surface, and a part of the second rod segment extends into the ring holding groove.

6. The stationary blade assembly according to claim 4, characterized in that: The adjusting member comprises a screwing portion for cooperating with a tool, wherein the screwing portion is arranged on the outside of the rod body and connected to the rod body.

7. The stationary blade assembly according to claim 6, characterized in that: The screwing portion includes an outer hexagonal structure and / or an inner hexagonal structure.

8. The stationary blade assembly according to claim 6, characterized in that: The through hole includes a first hole segment and a second hole segment, the hole diameter of the second hole segment is larger than the hole diameter of the first hole segment, the rod body is arranged in the first hole segment, and the screwing portion is arranged in the second hole segment.

9. A turbine, characterized in that: The invention comprises the stationary blade assembly according to any one of claims 1 to 8.

10. A gas turbine, characterized in that: Comprising the turbine as claimed in claim 9.

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